International Communications in Heat and Mass Transfer最新文献

英文中文

Tracking control of MFP piston trajectory

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-27 DOI: 10.1016/j.icheatmasstransfer.2025.108878

Yong Liu , Yijie Song , Fukang Ma , Zhiqiang Liu

The miniaturization of electrical equipment and the popularity of portable devices drive the development of small thermal engines. However, as the size of engines shrinks, problems that can be neglected at conventional scales become prominent in micro-compact heat engines. Micro free-piston generators, with their flexible piston trajectories, present innovative solutions to common problems and hold great potential for enhancing performance. Therefore, this paper proposes the design principles of the MFP system controller, determines a hierarchical control scheme for piston trajectory tracking and a dual state SISO controller. Through numerical simulation and experimental research under controlled and uncontrolled conditions, the effectiveness of the proposed controller in trajectory tracking and performance enhancement is demonstrated. The results show that, the position steady-state tracking error of feedforward feedback composite PID control is less than ±10 μm, improved by 77 % compared to traditional PID control; the step response of fuzzy PID control is more sensitive, the overshoot is less than 0.3 %; throughout the entire cycle, with a tracking error of no more than 1 mm, the actual cyclic displacement following error below 1.5 mm; the optimized piston trajectories lead to a power generation efficiency increase from 2.37 % to 2.72 %, reflecting a 14.8 % improvement.

{"title":"Tracking control of MFP piston trajectory","authors":"Yong Liu , Yijie Song , Fukang Ma , Zhiqiang Liu","doi":"10.1016/j.icheatmasstransfer.2025.108878","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108878","url":null,"abstract":"<div><div>The miniaturization of electrical equipment and the popularity of portable devices drive the development of small thermal engines. However, as the size of engines shrinks, problems that can be neglected at conventional scales become prominent in micro-compact heat engines. Micro free-piston generators, with their flexible piston trajectories, present innovative solutions to common problems and hold great potential for enhancing performance. Therefore, this paper proposes the design principles of the MFP system controller, determines a hierarchical control scheme for piston trajectory tracking and a dual state SISO controller. Through numerical simulation and experimental research under controlled and uncontrolled conditions, the effectiveness of the proposed controller in trajectory tracking and performance enhancement is demonstrated. The results show that, the position steady-state tracking error of feedforward feedback composite PID control is less than ±10 μm, improved by 77 % compared to traditional PID control; the step response of fuzzy PID control is more sensitive, the overshoot is less than 0.3 %; throughout the entire cycle, with a tracking error of no more than 1 mm, the actual cyclic displacement following error below 1.5 mm; the optimized piston trajectories lead to a power generation efficiency increase from 2.37 % to 2.72 %, reflecting a 14.8 % improvement.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108878"},"PeriodicalIF":6.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive study of the performance, economic and environmental impact of multi purpose refrigeration systems utilizing eco-friendly refrigerants for two-modulating cold storage

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-27 DOI: 10.1016/j.icheatmasstransfer.2025.108905

S. Alireza Zarabadi , Mostafa Mafi , Ehsan Taheran

Due to the strong dependence of the food industry on the cold chain, utilizing an optimal refrigeration system plays a crucial role in the cold storage facilities. This study investigates two multipurpose compression refrigeration systems, including flash tank and cascade systems, across four distinct climates with varying cooling load distribution between their stages used predominantly in multipurpose cold storage facilities. R744 and R290 and R717/R290 and R717/R744 refrigerants were scrutinized within flash tank and cascade refrigeration systems, respectively. Findings revealed that the R744 refrigerant is unsuitable for the flash tank system. The study established that while both systems have high energy and exergy efficiency, the cascade system outperforms the other by up to 12 % depending on cooling load distribution. When the cooling load is evenly distributed between above-zero and subzero temperature, the flash tank system becomes up to 3 % more cost-effective. However, as the cooling load distribution increases for subzero temperature ranges with the total cooling load being constant, the cascade system performs up to 22 % more efficiently in terms of economy, especially in hot and humid climates. Furthermore, at 50 % cooling load distribution, the flash tank system emitted up to 5 % less CO2 in different climates, while the cascade system, under increased cooling load, generated up to 40 % less CO2. Finally, comparing the two refrigerants revealed that R744 emission up to 13 %more CO2 than R290 at 90 %cooling load distribution in cold climates.

{"title":"A comprehensive study of the performance, economic and environmental impact of multi purpose refrigeration systems utilizing eco-friendly refrigerants for two-modulating cold storage","authors":"S. Alireza Zarabadi , Mostafa Mafi , Ehsan Taheran","doi":"10.1016/j.icheatmasstransfer.2025.108905","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108905","url":null,"abstract":"<div><div>Due to the strong dependence of the food industry on the cold chain, utilizing an optimal refrigeration system plays a crucial role in the cold storage facilities. This study investigates two multipurpose compression refrigeration systems, including flash tank and cascade systems, across four distinct climates with varying cooling load distribution between their stages used predominantly in multipurpose cold storage facilities. R744 and R290 and R717/R290 and R717/R744 refrigerants were scrutinized within flash tank and cascade refrigeration systems, respectively. Findings revealed that the R744 refrigerant is unsuitable for the flash tank system. The study established that while both systems have high energy and exergy efficiency, the cascade system outperforms the other by up to 12 % depending on cooling load distribution. When the cooling load is evenly distributed between above-zero and subzero temperature, the flash tank system becomes up to 3 % more cost-effective. However, as the cooling load distribution increases for subzero temperature ranges with the total cooling load being constant, the cascade system performs up to 22 % more efficiently in terms of economy, especially in hot and humid climates. Furthermore, at 50 % cooling load distribution, the flash tank system emitted up to 5 % less CO2 in different climates, while the cascade system, under increased cooling load, generated up to 40 % less CO2. Finally, comparing the two refrigerants revealed that R744 emission up to 13 %more CO2 than R290 at 90 %cooling load distribution in cold climates.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108905"},"PeriodicalIF":6.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical study on impact of the dissipative muffler on the cooling performance of the hybrid mechanical draft wet cooling tower

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-27 DOI: 10.1016/j.icheatmasstransfer.2025.108877

Xiaoyu Zhang, Fengzhong Sun

This study theoretically delves into the potential applications of dissipative mufflers in the hybrid mechanical draft wet cooling towers (MDWCTs). The influential mechanism of the chip muffler on the aerodynamic and thermal performances of the hybrid MDWCTs under crosswinds are systematically investigated by three-dimensional numerical simulation. The results manifest that the muffler exerts a significant influence on cooling tower ventilation by influencing the morphology and location of the transverse vortices beneath the water collection device. The theoretical analyses reveal that there is a robust correlation between the water temperature decrease and the effective ventilation rate under various operational conditions and tower structures. Moreover, the investigation of various muffler layouts demonstrates that the single-side intake and internal layout exhibit distinctive advantages in thermal performance. This study provides a solid theoretical basis for the optimal design of dissipative mufflers in MDWCT, which is an important impetus for the theoretical development of cooling tower technology.

{"title":"Theoretical study on impact of the dissipative muffler on the cooling performance of the hybrid mechanical draft wet cooling tower","authors":"Xiaoyu Zhang, Fengzhong Sun","doi":"10.1016/j.icheatmasstransfer.2025.108877","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108877","url":null,"abstract":"<div><div>This study theoretically delves into the potential applications of dissipative mufflers in the hybrid mechanical draft wet cooling towers (MDWCTs). The influential mechanism of the chip muffler on the aerodynamic and thermal performances of the hybrid MDWCTs under crosswinds are systematically investigated by three-dimensional numerical simulation. The results manifest that the muffler exerts a significant influence on cooling tower ventilation by influencing the morphology and location of the transverse vortices beneath the water collection device. The theoretical analyses reveal that there is a robust correlation between the water temperature decrease and the effective ventilation rate under various operational conditions and tower structures. Moreover, the investigation of various muffler layouts demonstrates that the single-side intake and internal layout exhibit distinctive advantages in thermal performance. This study provides a solid theoretical basis for the optimal design of dissipative mufflers in MDWCT, which is an important impetus for the theoretical development of cooling tower technology.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108877"},"PeriodicalIF":6.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bicriteria optimization of subcooled flow boiling in graphene-coated microchannels using response surface methodology

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-27 DOI: 10.1016/j.icheatmasstransfer.2025.108914

Edmund Chong Jie Ng, Jong Boon Ooi, Yew Mun Hung

This study investigates the optimization of subcooled flow boiling in microchannels coated with graphene nanoplatelet (GNP) surfaces of varying wettability and roughness using response surface methodology (RSM). Four surface treatments: uncoated, SHi-GNP (superhydrophilic), SHo-GNP (superhydrophobic), and U-GNP (dual-wettability), are compared to assess the influence on key performance parameters, including Nusselt number (Nu) and pressure drop (Δp). Experimental results show that SHi-GNP achieves the best balance between high heat transfer performance (Nu_max = 82.9) and low pressure drop (Δp_min = 441.4 Pa), attributed to its enhanced wetting properties that promote effective rewetting and bubble nucleation. U-GNP exhibits the highest Nusselt number (Nu_max = 108.9), but at the cost of the highest pressure drop (Δp_min = 2017 Pa), due to its combined hydrophilic and hydrophobic regions that enhance nucleation but increase fluid resistance due to high surface roughness. SHo-GNP manifests moderate improvement in both heat transfer and pressure drop, while the uncoated surface shows the lowest performance. RSM proves effective in identifying optimal Reynolds numbers and power inputs for each surface treatment, facilitating bicriteria optimization of heat transfer and fluid flow performance. These findings provide valuable insights into the design of microchannel heat sinks for high-performance electronics cooling.

{"title":"Bicriteria optimization of subcooled flow boiling in graphene-coated microchannels using response surface methodology","authors":"Edmund Chong Jie Ng, Jong Boon Ooi, Yew Mun Hung","doi":"10.1016/j.icheatmasstransfer.2025.108914","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108914","url":null,"abstract":"<div><div>This study investigates the optimization of subcooled flow boiling in microchannels coated with graphene nanoplatelet (GNP) surfaces of varying wettability and roughness using response surface methodology (RSM). Four surface treatments: uncoated, SHi-GNP (superhydrophilic), SHo-GNP (superhydrophobic), and U-GNP (dual-wettability), are compared to assess the influence on key performance parameters, including Nusselt number (<em>Nu</em>) and pressure drop (Δ<em>p</em>). Experimental results show that SHi-GNP achieves the best balance between high heat transfer performance (Nu<sub>max</sub> = 82.9) and low pressure drop (Δ<em>p</em><sub>min</sub> = 441.4 Pa), attributed to its enhanced wetting properties that promote effective rewetting and bubble nucleation. U-GNP exhibits the highest Nusselt number (Nu<sub>max</sub> = 108.9), but at the cost of the highest pressure drop (Δ<em>p</em><sub>min</sub> = 2017 Pa), due to its combined hydrophilic and hydrophobic regions that enhance nucleation but increase fluid resistance due to high surface roughness. SHo-GNP manifests moderate improvement in both heat transfer and pressure drop, while the uncoated surface shows the lowest performance. RSM proves effective in identifying optimal Reynolds numbers and power inputs for each surface treatment, facilitating bicriteria optimization of heat transfer and fluid flow performance. These findings provide valuable insights into the design of microchannel heat sinks for high-performance electronics cooling.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108914"},"PeriodicalIF":6.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative analysis of multichannel cold plates with various corrugated channel structures and dual flow outlets

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-27 DOI: 10.1016/j.icheatmasstransfer.2025.108908

Zainab Muwaffaq Saleh, Hayder Mohammad Jaffal

A multichannel cold plate is widely used for cooling electronics because of its high performance. This study aims to shed light on the different engineering effects on the characteristics of this cold plate. Splitting the outlet flow and using corrugated channels with different structures for six novel models are the proposed ways to achieve the best thermal performance with the least pressure losses. In addition to the straight channels, the corrugation of all channels was tested in three configurations: fully wavy, straight-wavy and wavy-straight. The corrugation of only the middle channels was tested in three shapes: zigzag, trapezoidal and wavy. Numerical simulation of the cold plate was conducted using the finite volume technique, and the results were verified experimentally for water flow rate ranging from 0.002 kg/s to 0.006 kg/s. Compared with the conventional single-inlet, single-outlet multichannel cold plate, the flow splitting at the outlet effectively reduces pressure losses even when using corrugated channels. Interestingly, using only wavy central channels is better than using fully wavy channels, achieving the same thermal-hydraulic performance as the fully wavy ones. Both achieved the highest performance evaluation factor of 1.92, thus indicating that the pressure losses for the fully wavy channels are the greatest.

{"title":"Comparative analysis of multichannel cold plates with various corrugated channel structures and dual flow outlets","authors":"Zainab Muwaffaq Saleh, Hayder Mohammad Jaffal","doi":"10.1016/j.icheatmasstransfer.2025.108908","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108908","url":null,"abstract":"<div><div>A multichannel cold plate is widely used for cooling electronics because of its high performance. This study aims to shed light on the different engineering effects on the characteristics of this cold plate. Splitting the outlet flow and using corrugated channels with different structures for six novel models are the proposed ways to achieve the best thermal performance with the least pressure losses. In addition to the straight channels, the corrugation of all channels was tested in three configurations: fully wavy, straight-wavy and wavy-straight. The corrugation of only the middle channels was tested in three shapes: zigzag, trapezoidal and wavy. Numerical simulation of the cold plate was conducted using the finite volume technique, and the results were verified experimentally for water flow rate ranging from 0.002 kg/s to 0.006 kg/s. Compared with the conventional single-inlet, single-outlet multichannel cold plate, the flow splitting at the outlet effectively reduces pressure losses even when using corrugated channels. Interestingly, using only wavy central channels is better than using fully wavy channels, achieving the same thermal-hydraulic performance as the fully wavy ones. Both achieved the highest performance evaluation factor of 1.92, thus indicating that the pressure losses for the fully wavy channels are the greatest.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108908"},"PeriodicalIF":6.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of intelligent scheduling and optimization decision system for multi-source regional crude oil transportation and distribution system

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-26 DOI: 10.1016/j.icheatmasstransfer.2025.108881

Xiaoqin Xiong , Ning Xu , Xiaokai Xing , Runbin Xue , Yuanyuan Li

How to apply optimization methods, establish intelligent scheduling systems, ensure safe and efficient transportation of crude oil, and achieve maximum economic benefits is the focus of attention for oil companies. In this paper, first, the difficulties of intelligent decision-making in crude oil transportation and distribution systems were analyzed. Second, the intelligent decision-making framework, simulation and deduction techniques, and decision optimization techniques were explained. Third, combined with the objective function and constraint conditions, a crude oil blending optimization model was established. Third, combined with the objective function and constraint conditions, a production profit maximization model was established. Results show that: (a) After 500 iterations, the average similarity was greater than 95 %. Successfully calculated the optimal blending ratio of crude oil under the corresponding conditions for each target crude oil. (b) under the condition that the upper limit of all crude oil purchases is 3850 tons, when the crude oil processing volume of the blending crude oil scheme W1–W2 is 2000 tons and 1850 tons respectively, the enterprise's production profit reaches the maximum of 705,400 RMB. (c) Model validation shows that the system can achieve upstream and downstream collaborative optimization, with strong effectiveness and feasibility.

{"title":"Design of intelligent scheduling and optimization decision system for multi-source regional crude oil transportation and distribution system","authors":"Xiaoqin Xiong , Ning Xu , Xiaokai Xing , Runbin Xue , Yuanyuan Li","doi":"10.1016/j.icheatmasstransfer.2025.108881","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108881","url":null,"abstract":"<div><div>How to apply optimization methods, establish intelligent scheduling systems, ensure safe and efficient transportation of crude oil, and achieve maximum economic benefits is the focus of attention for oil companies. In this paper, first, the difficulties of intelligent decision-making in crude oil transportation and distribution systems were analyzed. Second, the intelligent decision-making framework, simulation and deduction techniques, and decision optimization techniques were explained. Third, combined with the objective function and constraint conditions, a crude oil blending optimization model was established. Third, combined with the objective function and constraint conditions, a production profit maximization model was established. Results show that: (a) After 500 iterations, the average similarity was greater than 95 %. Successfully calculated the optimal blending ratio of crude oil under the corresponding conditions for each target crude oil. (b) under the condition that the upper limit of all crude oil purchases is 3850 tons, when the crude oil processing volume of the blending crude oil scheme W1–W2 is 2000 tons and 1850 tons respectively, the enterprise's production profit reaches the maximum of 705,400 RMB. (c) Model validation shows that the system can achieve upstream and downstream collaborative optimization, with strong effectiveness and feasibility.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108881"},"PeriodicalIF":6.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic impact of baffles and winglets on thermal/hydraulic behavior of rectangular duct: Machine learning-based assessment

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-26 DOI: 10.1016/j.icheatmasstransfer.2025.108842

Issa A. Azab, Mohamed A. Saleh, Osama M. Mesalhy, Wael M. Elwan, Mohamed A. Abdelatief

In this research, an investigation is conducted into the thermal and hydraulic performance of an air-cooled channel, equipped with a combination of baffles and winglets. Specifically, hollow trapezoidal baffles of a wavy top surface and three sets of winglets have been selected from the literature as the basis of further numerical optimization. First, the spacing between the selected baffles is optimized in both longitudinal (L/P_L = 0.2–0.8) and transverse (S/P_t = 0.2–0.8) directions. Artificial neural network modeling (ANN) is employed to predict the optimum design condition and visualize the impact of individual input parameters. The Bayesian regularization algorithm is utilized in conjunction with the backpropagation technique to determine the ideal size of the ANN. Then, delta winglets are introduced between baffle rows with different shapes, arrangements, and orientations. In this study, air serves as the working fluid and is examined across a range of Reynolds numbers (3.8 × 10³ ≤ Re ≤ 2.4 × 10⁴). By leveraging numerical simulations and machine learning, the integration of baffles and winglets offers a promising passive cooling technique. For baffles, longitudinal length-to-pitch ratio L/P_L = 0.2 and transverse width-to-pitch ratio S/P_t = 0.4 provide the best performance as TEF value reached 1.68 achieving an average gain of 35.9 % compared to the non-optimized one in literature. A comparison of the different sets of winglets demonstrated that delta winglets at a 30° orientation angle provide the best performance. A single row of winglets provided an additional gain of 10.4 % in TEF average value compared to the case without winglets. Two rows of the optimum winglet shape are then optimized in aligned and staggered arrangements at different spacing ratio (P_W/P_L = 0.3–0.7). TEF attains its peak value of approximately 1.81 at P_W/P_L = 0.5 in aligned configurations, reflecting an overall 54.7 % improvement compared to the base case.

{"title":"Synergistic impact of baffles and winglets on thermal/hydraulic behavior of rectangular duct: Machine learning-based assessment","authors":"Issa A. Azab, Mohamed A. Saleh, Osama M. Mesalhy, Wael M. Elwan, Mohamed A. Abdelatief","doi":"10.1016/j.icheatmasstransfer.2025.108842","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108842","url":null,"abstract":"<div><div>In this research, an investigation is conducted into the thermal and hydraulic performance of an air-cooled channel, equipped with a combination of baffles and winglets. Specifically, hollow trapezoidal baffles of a wavy top surface and three sets of winglets have been selected from the literature as the basis of further numerical optimization. First, the spacing between the selected baffles is optimized in both longitudinal (<em>L/P</em><sub><em>L</em></sub> <em>=</em> 0.2–0.8) and transverse (<em>S/P</em><sub><em>t</em></sub> <em>=</em> 0.2–0.8) directions. Artificial neural network modeling (ANN) is employed to predict the optimum design condition and visualize the impact of individual input parameters. The Bayesian regularization algorithm is utilized in conjunction with the backpropagation technique to determine the ideal size of the ANN. Then, delta winglets are introduced between baffle rows with different shapes, arrangements, and orientations. In this study, air serves as the working fluid and is examined across a range of Reynolds numbers (3.8 × 10<sup>3</sup> ≤ <em>Re</em> ≤ 2.4 × 10<sup>4</sup>). By leveraging numerical simulations and machine learning, the integration of baffles and winglets offers a promising passive cooling technique. For baffles, longitudinal length-to-pitch ratio <em>L/P</em><sub><em>L</em></sub> <em>=</em> 0.2 and transverse width-to-pitch ratio <em>S/P</em><sub><em>t</em></sub> <em>=</em> 0.4 provide the best performance as <em>TEF</em> value reached 1.68 achieving an average gain of 35.9 % compared to the non-optimized one in literature. A comparison of the different sets of winglets demonstrated that delta winglets at a 30° orientation angle provide the best performance. A single row of winglets provided an additional gain of 10.4 % in <em>TEF</em> average value compared to the case without winglets. Two rows of the optimum winglet shape are then optimized in aligned and staggered arrangements at different spacing ratio (<em>P</em><sub><em>W</em></sub><em>/P</em><sub><em>L</em></sub> = 0.3–0.7). <em>TEF</em> attains its peak value of approximately 1.81 at <em>P</em><sub><em>W</em></sub><em>/P</em><sub><em>L</em></sub> = 0.5 in aligned configurations, reflecting an overall 54.7 % improvement compared to the base case.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108842"},"PeriodicalIF":6.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation for hydrogenation process inside metal hydride canister and optimized fin structure for minimized hydrogenation time

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-25 DOI: 10.1016/j.icheatmasstransfer.2025.108863

Chao Bai, Huakun Zhao, Maocheng Tian

We present a new model for hydrogenation process and compare our numerical results with experimental data of Jemni. To enhance heat-transfer during hydrogenation process inside metal hydride canister, the evolutionary topology optimization method is applied under reasonable assumptions to find the optimized fin configurations. Then the optimally finned metal hydride canister performance is calculated. Compared with the initial metal hydride canister, the finned metal hydride canister can shorten the absorption time of hydrogen by 86.1 %.

引用次数: 0

Multi-level optimization of thermal management systems with compact large-bend configurations in hybrid electric vehicles

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-25 DOI: 10.1016/j.icheatmasstransfer.2025.108901

Yu Yang, Qianghui Xu, Siyu Zheng, Tao Yang, Yongzhen Wang, Pengcheng Zhang, Jun Shen

The thermal management system design for specialized hybrid vehicles presents unique challenges, particularly due to the presence of a 90° bend in the airflow path. This study proposes a multi-level modelling and optimization methodology aimed at meeting cooling requirements while minimizing airflow pressure drop across all system components, despite spatial constraints. The integrated modelling framework incorporates a zero-dimensional heat transfer model, a one-dimensional model for non-uniform airflow, and three-dimensional computational fluid dynamics simulations. Coupled with the NSGA-II algorithm, the optimization addresses multiscale structures, including fin design, radiator arrangement, radiator dimensions, and air duct size. The 90° bend induces substantial non-uniform flux across the radiator's airflow face, reducing heat transfer performance by up to 10 % compared to uniform airflow. However, adjusting the radiator thickness and expanding the air duct can mitigate this non-uniformity, reducing it by up to 40 %. Results indicate that the total pressure drop initially decreases and then increases as the air duct expands and the radiator thins, due to the interplay of pressure drop across components, allowing for the identification of an optimal radiator height. This optimization framework and the insights gained provide valuable guidance for developing integrated thermal management systems for large-bend configurations in hybrid electric vehicles.

{"title":"Multi-level optimization of thermal management systems with compact large-bend configurations in hybrid electric vehicles","authors":"Yu Yang, Qianghui Xu, Siyu Zheng, Tao Yang, Yongzhen Wang, Pengcheng Zhang, Jun Shen","doi":"10.1016/j.icheatmasstransfer.2025.108901","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108901","url":null,"abstract":"<div><div>The thermal management system design for specialized hybrid vehicles presents unique challenges, particularly due to the presence of a 90° bend in the airflow path. This study proposes a multi-level modelling and optimization methodology aimed at meeting cooling requirements while minimizing airflow pressure drop across all system components, despite spatial constraints. The integrated modelling framework incorporates a zero-dimensional heat transfer model, a one-dimensional model for non-uniform airflow, and three-dimensional computational fluid dynamics simulations. Coupled with the NSGA-II algorithm, the optimization addresses multiscale structures, including fin design, radiator arrangement, radiator dimensions, and air duct size. The 90° bend induces substantial non-uniform flux across the radiator's airflow face, reducing heat transfer performance by up to 10 % compared to uniform airflow. However, adjusting the radiator thickness and expanding the air duct can mitigate this non-uniformity, reducing it by up to 40 %. Results indicate that the total pressure drop initially decreases and then increases as the air duct expands and the radiator thins, due to the interplay of pressure drop across components, allowing for the identification of an optimal radiator height. This optimization framework and the insights gained provide valuable guidance for developing integrated thermal management systems for large-bend configurations in hybrid electric vehicles.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108901"},"PeriodicalIF":6.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulations of heat and mass transfer in Sutterby fluid within porous media using Caputo fractional derivative

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-03-25 DOI: 10.1016/j.icheatmasstransfer.2025.108850

Ali Haider , M.S. Anwar , Yufeng Nie , Taseer Muhammad

This study enhances fluid modeling by integrating Caputo’s fractional derivative to improve accuracy in representing integer and non-integer order dynamics. Addressing the complexities of viscoelastic fluid behavior, it extends our understanding of fluid dynamics across diverse applications. A two-dimensional fractional Sutterby fluid model is analyzed under time-dependent conditions, incorporating convection, porous media, diffusion, thermal radiation, and chemical reaction. The model highlights the memory and inheritance effects of viscoelastic fluids. The governing equations are transformed using non-dimensional parameters and discretized via the explicit finite difference method. Quantities of physical interest, including the skin friction coefficient, Nusselt number, and Sherwood number, are computed to ensure model reliability, with stability analysis confirming convergence. A MATLAB algorithm is developed to visualize fractional and dimensionless parameter effects, with graphical results demonstrating model robustness. This study uniquely integrates fractional derivatives with porous media analysis in viscoelastic fluid contexts. The findings have implications for catalytic converters, gas turbines, and condensers, showing the potential of fractional derivatives to improve efficiency and reduce energy consumption.

{"title":"Numerical simulations of heat and mass transfer in Sutterby fluid within porous media using Caputo fractional derivative","authors":"Ali Haider , M.S. Anwar , Yufeng Nie , Taseer Muhammad","doi":"10.1016/j.icheatmasstransfer.2025.108850","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108850","url":null,"abstract":"<div><div>This study enhances fluid modeling by integrating Caputo’s fractional derivative to improve accuracy in representing integer and non-integer order dynamics. Addressing the complexities of viscoelastic fluid behavior, it extends our understanding of fluid dynamics across diverse applications. A two-dimensional fractional Sutterby fluid model is analyzed under time-dependent conditions, incorporating convection, porous media, diffusion, thermal radiation, and chemical reaction. The model highlights the memory and inheritance effects of viscoelastic fluids. The governing equations are transformed using non-dimensional parameters and discretized via the explicit finite difference method. Quantities of physical interest, including the skin friction coefficient, Nusselt number, and Sherwood number, are computed to ensure model reliability, with stability analysis confirming convergence. A MATLAB algorithm is developed to visualize fractional and dimensionless parameter effects, with graphical results demonstrating model robustness. This study uniquely integrates fractional derivatives with porous media analysis in viscoelastic fluid contexts. The findings have implications for catalytic converters, gas turbines, and condensers, showing the potential of fractional derivatives to improve efficiency and reduce energy consumption.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108850"},"PeriodicalIF":6.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

International Communications in Heat and Mass Transfer

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀