International Communications in Heat and Mass Transfer最新文献_第10页

Effects of key thermal parameters on the flow boiling process of water and prediction of the heat transfer coefficient in the corrugated plate heat exchanger

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-14 DOI: 10.1016/j.icheatmasstransfer.2025.108709

Fulin Kong , Xiaoxiao Wang , Wei Guo , Xiaoyu Li , Yongqiang Ren , Shisen Xu

The thermal parameters of the corrugated plate heat exchanger (CPHE) significantly affect its flow and heat transfer performance. To investigate the influence of key thermal parameters on the flow boiling process of water in CPHE, this study established a three-dimensional numerical model based on the VOF model and Lee evaporation model. The Nusselt number and heat transfer coefficient were calculated, and the simulation results were validated with experimental results showing an error of less than 5 %. The key flow and heat/mass transfer parameters of different height sections and the entire fluid domain were simultaneously calculated. The effects of wall superheat (5.0–12.5 K), inlet subcooling (−5.0–0 K), and inlet velocity (0.4–0.8 m/s) on pressure drop, mass transfer rate, heat transfer coefficient, etc. were analyzed. The main conclusions are as follows: the two-phase pressure drop mainly depends on the flow rate and the gas-liquid volume fraction. The mass transfer rate has a positive correlation with the superheat, and a negative correlation with the subcooling degree and the flow rate. Velocity affects the heat transfer coefficient more easily than superheat and inlet velocity. When the inlet flow rate is 0.8 m/s, the heat transfer coefficient is 23.23 kW/(m² K), which is 12.00 kW/(m² K) higher than that when the inlet flow rate is 0.4 m/s, about 106.78 %. This study presents a novel correlation that can precisely predict the heat transfer coefficient in the flow boiling process within a specific range, with an average prediction error of merely 6.71 % and a correlation coefficient of 0.98. The research findings are beneficial for the thermal design and heat-mass transfer enhancement of heat exchangers with phase change processes.

{"title":"Effects of key thermal parameters on the flow boiling process of water and prediction of the heat transfer coefficient in the corrugated plate heat exchanger","authors":"Fulin Kong , Xiaoxiao Wang , Wei Guo , Xiaoyu Li , Yongqiang Ren , Shisen Xu","doi":"10.1016/j.icheatmasstransfer.2025.108709","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108709","url":null,"abstract":"<div><div>The thermal parameters of the corrugated plate heat exchanger (CPHE) significantly affect its flow and heat transfer performance. To investigate the influence of key thermal parameters on the flow boiling process of water in CPHE, this study established a three-dimensional numerical model based on the VOF model and Lee evaporation model. The Nusselt number and heat transfer coefficient were calculated, and the simulation results were validated with experimental results showing an error of less than 5 %. The key flow and heat/mass transfer parameters of different height sections and the entire fluid domain were simultaneously calculated. The effects of wall superheat (5.0–12.5 K), inlet subcooling (−5.0–0 K), and inlet velocity (0.4–0.8 m/s) on pressure drop, mass transfer rate, heat transfer coefficient, etc. were analyzed. The main conclusions are as follows: the two-phase pressure drop mainly depends on the flow rate and the gas-liquid volume fraction. The mass transfer rate has a positive correlation with the superheat, and a negative correlation with the subcooling degree and the flow rate. Velocity affects the heat transfer coefficient more easily than superheat and inlet velocity. When the inlet flow rate is 0.8 m/s, the heat transfer coefficient is 23.23 kW/(m<sup>2</sup> K), which is 12.00 kW/(m<sup>2</sup> K) higher than that when the inlet flow rate is 0.4 m/s, about 106.78 %. This study presents a novel correlation that can precisely predict the heat transfer coefficient in the flow boiling process within a specific range, with an average prediction error of merely 6.71 % and a correlation coefficient of 0.98. The research findings are beneficial for the thermal design and heat-mass transfer enhancement of heat exchangers with phase change processes.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108709"},"PeriodicalIF":6.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418928","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

Effect of nanoparticle size on the thermal performance of paraffin-O2 hybrid heat sink using molecular dynamics approach 利用分子动力学方法研究纳米粒子尺寸对石蜡-O2 混合散热器热性能的影响

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-14 DOI: 10.1016/j.icheatmasstransfer.2025.108713

Yi Ru , Ali B.M. Ali , Karwan Hussein Qader , Rasha Abed Hussein , Ramdevsinh Jhala , Mukhlisa Soliyeva , Soheil Salahshour , M. Hekmatifar

Phase change materials and nanostructures are necessary to raise the efficiency of thermal energy (TE) storage systems, hence improving the efficiency of energy storage units. For this reason, the construction makes use of metal oxides and nanoscale metal particles. This work examined, using molecular dynamics modeling, the influence of nanoparticle (NP) size on the paraffin/O₂/Al₂O₃ hybrid heat sink performance. The results show that the thermal conductivity of the structure rose from 391.34 to 404.44 W/m.K as Al₂O₃ NP size rose. This resulted in lengthier NP aggregation from 6.95 to 7.02 ns. Moreover, changing the radius of NPs in a simulated construction would boost the heat flow from 333.99 to 368.05 W/m². Consequently, phase change materials and nanostructures improve the heat transfer (HT) and storage capacity of the system. Renewable energy systems, electronics cooling, and thermal management in industrial processes are just a few of the many disciplines where this technology might find use.

{"title":"Effect of nanoparticle size on the thermal performance of paraffin-O2 hybrid heat sink using molecular dynamics approach","authors":"Yi Ru , Ali B.M. Ali , Karwan Hussein Qader , Rasha Abed Hussein , Ramdevsinh Jhala , Mukhlisa Soliyeva , Soheil Salahshour , M. Hekmatifar","doi":"10.1016/j.icheatmasstransfer.2025.108713","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108713","url":null,"abstract":"<div><div>Phase change materials and nanostructures are necessary to raise the efficiency of thermal energy (TE) storage systems, hence improving the efficiency of energy storage units. For this reason, the construction makes use of metal oxides and nanoscale metal particles. This work examined, using molecular dynamics modeling, the influence of nanoparticle (NP) size on the paraffin/O<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> hybrid heat sink performance. The results show that the thermal conductivity of the structure rose from 391.34 to 404.44 W/m.K as Al<sub>2</sub>O<sub>3</sub> NP size rose. This resulted in lengthier NP aggregation from 6.95 to 7.02 ns. Moreover, changing the radius of NPs in a simulated construction would boost the heat flow from 333.99 to 368.05 W/m<sup>2</sup>. Consequently, phase change materials and nanostructures improve the heat transfer (HT) and storage capacity of the system. Renewable energy systems, electronics cooling, and thermal management in industrial processes are just a few of the many disciplines where this technology might find use.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108713"},"PeriodicalIF":6.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418927","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 novel optimized liquid cooled heat sink integrated with 3D lattice structure under different blockage ratios

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-13 DOI: 10.1016/j.icheatmasstransfer.2025.108715

Aditya Narkhede , N. Gnanasekaran , Ajay Kumar Yadav

In this numerical work, investigation is focused on thermo-hydraulic nature of a periodic metal foam-integrated heat sink with an octet lattice-structure topology. Heat sink is partially filled with octet structure based periodic metal foam having 2.5 mm unit cell length with blockage ratios of 0.25/0.5/0.75/1, porosity of 0.83/0.87/0.91, and flow velocity of 0.02–0.05 m/s for electronic thermal management. The effect of porosity and blockage ratio on the wall temperature and pressure gradient of the heat sink is examined. Among all configurations, the lowest value of wall temperature of 311.24 K and the highest value of pressure gradient of 5091 Pa/m are observed for the case of blockage ratio 1, porosity 0.83, and flow velocity of 0.05 m/s. Additionally, the thermo-hydraulic performance enhancement owing to the partly packed configuration is observed based on the enhancement ratio and thermo-hydraulic performance parameter (THPP). The highest enhancement ratio is observed for the case with a blockage ratio of 1, porosity of 0.83, and a velocity of 0.02 m/s. The thermal design with a velocity of 0.03 m/s, a blockage ratio of 0.75, and a porosity of 0.83 is considered the optimal design in accordance with the THPP, which has a value of approximately 1.7.

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引用次数: 0

Multifunctional asymmetric directional thermal radiation device and its detecting potential

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-13 DOI: 10.1016/j.icheatmasstransfer.2025.108720

Hao-Ran Xu, Bao-Fei Wan, Hai-Feng Zhang

In this paper, a Weyl semimetal asymmetrical metastructure (WSAM) is proposed to fulfill multifunctional thermal radiation adjustment in the near-infrared band. When the transverse magnetic (TM) waves incident from two sides of the WSAM, two kinds of different thermal asymmetry have been established. From the forward direction, thermal radiation (e) displays a huge asymmetry degree (η_1,2 = |e(θ) - e(−θ)| = 0.9) for the positive and negative incident angles (±θ), which can be applied in the area of thermal management. At the same time, for TM waves incident with +θ, radiation peak (e > 0.9) corresponding to wavelength has a linear relationship with θ as λ = −5.09 × 10⁻⁴θ + 4.5221 μm, and the average values of introduced figure of merit, detection limit, and Q are 0.016 /°, 3.1958°, and 141.4229, respectively, all displays good detection of θ, which is the direction of transmitted TM waves. From the backward direction, asymmetric directional thermal radiation (ADTR) has been made. In the case of λ = 4.434 μm, ADTR covers the range of 34° ∼ 82°, and η₂ can get as 0.45, while at λ = 4.430 μm, the range of ADTR shortens to 51° ∼ 77.3°, which has a better directionality, and the η₂ improves to 0.75. In this situation, the designed WSAM has the potential for infrared stealth, infrared information encryption, and thermal radiation cooling.

{"title":"Multifunctional asymmetric directional thermal radiation device and its detecting potential","authors":"Hao-Ran Xu, Bao-Fei Wan, Hai-Feng Zhang","doi":"10.1016/j.icheatmasstransfer.2025.108720","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108720","url":null,"abstract":"<div><div>In this paper, a Weyl semimetal asymmetrical metastructure (WSAM) is proposed to fulfill multifunctional thermal radiation adjustment in the near-infrared band. When the transverse magnetic (TM) waves incident from two sides of the WSAM, two kinds of different thermal asymmetry have been established. From the forward direction, thermal radiation (<em>e</em>) displays a huge asymmetry degree (<em>η</em><sub>1,2</sub> = |<em>e</em>(<em>θ</em>) - <em>e</em>(−<em>θ</em>)| = 0.9) for the positive and negative incident angles (±<em>θ</em>), which can be applied in the area of thermal management. At the same time, for TM waves incident with +<em>θ</em>, radiation peak (<em>e</em> > 0.9) corresponding to wavelength has a linear relationship with <em>θ</em> as <em>λ</em> = −5.09 × 10<sup>−4</sup><em>θ</em> + 4.5221 μm, and the average values of introduced figure of merit, detection limit, and <em>Q</em> are 0.016 /°, 3.1958°, and 141.4229, respectively, all displays good detection of <em>θ</em>, which is the direction of transmitted TM waves. From the backward direction, asymmetric directional thermal radiation (ADTR) has been made. In the case of <em>λ</em> = 4.434 μm, ADTR covers the range of 34° ∼ 82°, and <em>η</em><sub>2</sub> can get as 0.45, while at <em>λ</em> = 4.430 μm, the range of ADTR shortens to 51° ∼ 77.3°, which has a better directionality, and the <em>η</em><sub>2</sub> improves to 0.75. In this situation, the designed WSAM has the potential for infrared stealth, infrared information encryption, and thermal radiation cooling.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108720"},"PeriodicalIF":6.4,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403253","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

Molecular dynamics simulation of thermal conductivity of GaN

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-13 DOI: 10.1016/j.icheatmasstransfer.2025.108658

Mustafa Ozsipahi , Sophia Jean , Ali Beskok , Adam A. Wilson

Wurtzite GaN (gallium nitride) is a technologically significant semiconductor material known for its diverse applications in optoelectronics and high-power electronics. Understanding its thermal properties is crucial for optimizing the performance and efficiency of GaN-based devices. This study investigates the thermal conductivity of wurtzite GaN along the [0001] crystallographic direction at 300 K. We employ two computational methods: Non-Equilibrium Molecular Dynamics (NEMD) and Equilibrium Molecular Dynamics (EMD). NEMD involves applying a heat flux/sink to the system and measuring the resulting temperature gradient to determine thermal conductivity. We introduce a novel interpolation method for predicting thermal conductivity and extend our simulations to sizes up to 8.5 micrometers to explore size effects. Results reveal that linear extrapolation of thermal resistivity versus the reciprocal of system length is not valid for GaN. EMD is employed using the Green-Kubo method, which calculates thermal conductivity by analyzing heat flux autocorrelation functions at equilibrium. We compare the results from NEMD, EMD, various analytical models, experiments, and first-principles calculations. Our results reveal that NEMD provides thermal conductivity values approximately 1.3 times higher than those obtained from EMD. This comparative analysis presents the strengths and limitations of each method and provides a thorough understanding of the thermal transport properties of GaN.

{"title":"Molecular dynamics simulation of thermal conductivity of GaN","authors":"Mustafa Ozsipahi , Sophia Jean , Ali Beskok , Adam A. Wilson","doi":"10.1016/j.icheatmasstransfer.2025.108658","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108658","url":null,"abstract":"<div><div>Wurtzite GaN (gallium nitride) is a technologically significant semiconductor material known for its diverse applications in optoelectronics and high-power electronics. Understanding its thermal properties is crucial for optimizing the performance and efficiency of GaN-based devices. This study investigates the thermal conductivity of wurtzite GaN along the [0001] crystallographic direction at 300 K. We employ two computational methods: Non-Equilibrium Molecular Dynamics (NEMD) and Equilibrium Molecular Dynamics (EMD). NEMD involves applying a heat flux/sink to the system and measuring the resulting temperature gradient to determine thermal conductivity. We introduce a novel interpolation method for predicting thermal conductivity and extend our simulations to sizes up to 8.5 micrometers to explore size effects. Results reveal that linear extrapolation of thermal resistivity versus the reciprocal of system length is not valid for GaN. EMD is employed using the Green-Kubo method, which calculates thermal conductivity by analyzing heat flux autocorrelation functions at equilibrium. We compare the results from NEMD, EMD, various analytical models, experiments, and first-principles calculations. Our results reveal that NEMD provides thermal conductivity values approximately 1.3 times higher than those obtained from EMD. This comparative analysis presents the strengths and limitations of each method and provides a thorough understanding of the thermal transport properties of GaN.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108658"},"PeriodicalIF":6.4,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395154","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

Study on full-scale experimental and numerical investigation of fire-induced smoke control in an underground Double-Island Subway Station

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-12 DOI: 10.1016/j.icheatmasstransfer.2025.108697

Xueren Li , Liwei Zhang , Bichen Shang , Xiang Fang , Yao Tao , Yin Ma , Yong Wang , Jiyuan Tu

Effective smoke control in densely populated subway stations is crucial for safe passenger evacuation during a fire. This study conducted two full-scale fire experiments in the hall and platform of a double-island subway station. The characteristics of smoke flow and the effectiveness of smoke exhaust systems were evaluated by analyzing the vertical temperature distribution and CO/CO₂ levels in key regions. Fire Dynamics Simulator (FDS) was further employed to optimize key factors, such as ceiling perforation rate, smoke reservoir utilization, and vent orientation. The results demonstrated that, although smoke removal at breathing height generally met fire safety requirements (i.e., temperature below 30 °C, and CO and CO₂ levels under 1.2 ppm and 500 ppm, respectively), an insufficient ceiling perforation ratio hindered smoke storage, causing some fire smoke to spread along the ceiling as jet flow. Using FDS, the study found that the optimal design included a smoke reservoir utilization rate of 40 %, a ceiling perforation rate of 40 %, and upward-oriented exhaust vents. This study aimed to enhance understanding of smoke control effectiveness and offers insights for designing fire-induced smoke control systems in underground double-island subway stations.

{"title":"Study on full-scale experimental and numerical investigation of fire-induced smoke control in an underground Double-Island Subway Station","authors":"Xueren Li , Liwei Zhang , Bichen Shang , Xiang Fang , Yao Tao , Yin Ma , Yong Wang , Jiyuan Tu","doi":"10.1016/j.icheatmasstransfer.2025.108697","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108697","url":null,"abstract":"<div><div>Effective smoke control in densely populated subway stations is crucial for safe passenger evacuation during a fire. This study conducted two full-scale fire experiments in the hall and platform of a double-island subway station. The characteristics of smoke flow and the effectiveness of smoke exhaust systems were evaluated by analyzing the vertical temperature distribution and CO<em>/</em>CO<sub>2</sub> levels in key regions. Fire Dynamics Simulator (FDS) was further employed to optimize key factors, such as ceiling perforation rate, smoke reservoir utilization, and vent orientation. The results demonstrated that, although smoke removal at breathing height generally met fire safety requirements (i.e., temperature below 30 °C, and CO and CO<sub>2</sub> levels under 1.2 ppm and 500 ppm, respectively), an insufficient ceiling perforation ratio hindered smoke storage, causing some fire smoke to spread along the ceiling as jet flow. Using FDS, the study found that the optimal design included a smoke reservoir utilization rate of 40 %, a ceiling perforation rate of 40 %, and upward-oriented exhaust vents. This study aimed to enhance understanding of smoke control effectiveness and offers insights for designing fire-induced smoke control systems in underground double-island subway stations.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108697"},"PeriodicalIF":6.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386301","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 effects of cadmium telluride and graphite nanoparticles with entropy analysis through Keller-box method

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-12 DOI: 10.1016/j.icheatmasstransfer.2025.108667

Mahnoor Sarfraz , Khursheed Muhammad , N. Ameer Ahammad , Ibrahim E. Elseesy

Motivated by the growing demand for high-efficiency photovoltaic systems, this research innovatively explores the enhancement of solar cell efficiency and thermal regulation through the strategic combination of cadmium telluride and graphite nanoparticles in water. It compares hybrid nanofluids (

CdTe

+

C

+

H_{2} O

) with mono nanofluids (

CdTe

+

H_{2} O

) across two distinct stagnation-point flows: Crane's stretching flow (Hiemenz flow) and radial stretching flow (Homann flow). The novelty of the study stems from the synergistic properties of these nanoparticles, as cadmium telluride excels in converting sunlight into electricity, while graphite offers thermal stability and energy storage potential, making their combination a powerful tool for optimizing a system. In addition, the effects of critical factors, such as permeability, Joule heating, the Hall effect, energy generation/absorption, and irreversibility, are meticulously studied for spherical-shaped particles in both profiles. Numerical solutions are derived using the Keller-Box Method in MATLAB, demonstrating the method's accuracy in solving nonlinear problems. The results conclusively demonstrate that hybrid nanofluids offer superior thermal conductivity and heat management compared to mono nanofluids. Notably, radiative heat transfer is the dominant mechanism in boosting solar cell energy output and improving thermal insulation. The stretching-strain rate ratio augments the energy transport rate while reducing frictional forces. The study also finds that Crane's stretching flow exhibits more pronounced effects, displaying stronger thermal conductivity and superior suitability for photovoltaic cells. These findings underscore the potential of hybrid nanofluids in next-generation solar energy systems.

{"title":"Synergistic effects of cadmium telluride and graphite nanoparticles with entropy analysis through Keller-box method","authors":"Mahnoor Sarfraz , Khursheed Muhammad , N. Ameer Ahammad , Ibrahim E. Elseesy","doi":"10.1016/j.icheatmasstransfer.2025.108667","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108667","url":null,"abstract":"<div><div>Motivated by the growing demand for high-efficiency photovoltaic systems, this research innovatively explores the enhancement of solar cell efficiency and thermal regulation through the strategic combination of cadmium telluride and graphite nanoparticles in water. It compares hybrid nanofluids (<span><math><mi>CdTe</mi></math></span>+<span><math><mi>C</mi></math></span>+<span><math><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></span>) with mono nanofluids (<span><math><mi>CdTe</mi></math></span>+<span><math><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></span>) across two distinct stagnation-point flows: Crane's stretching flow (Hiemenz flow) and radial stretching flow (Homann flow). The novelty of the study stems from the synergistic properties of these nanoparticles, as cadmium telluride excels in converting sunlight into electricity, while graphite offers thermal stability and energy storage potential, making their combination a powerful tool for optimizing a system. In addition, the effects of critical factors, such as permeability, Joule heating, the Hall effect, energy generation/absorption, and irreversibility, are meticulously studied for spherical-shaped particles in both profiles. Numerical solutions are derived using the Keller-Box Method in MATLAB, demonstrating the method's accuracy in solving nonlinear problems. The results conclusively demonstrate that hybrid nanofluids offer superior thermal conductivity and heat management compared to mono nanofluids. Notably, radiative heat transfer is the dominant mechanism in boosting solar cell energy output and improving thermal insulation. The stretching-strain rate ratio augments the energy transport rate while reducing frictional forces. The study also finds that Crane's stretching flow exhibits more pronounced effects, displaying stronger thermal conductivity and superior suitability for photovoltaic cells. These findings underscore the potential of hybrid nanofluids in next-generation solar energy systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108667"},"PeriodicalIF":6.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395205","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

Analytical solutions of 2D orthotropic transient heat conduction problems under Robin boundary conditions within the symplectic framework

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-12 DOI: 10.1016/j.icheatmasstransfer.2025.108694

Jinbao Li , Dian Xu , Chaoyu Cheng, Rui Li

The Robin boundary conditions-based orthotropic transient heat conduction problems are frequently encountered in engineering applications, which are characterized by the coupled effect of temperature and heat flux. Although numerous attentions have been paid to this topic, the current focus is mainly on isotropic materials, and analytical solutions are still scarce due to mathematical challenges. This study presents novel analytical solutions of 2D orthotropic transient heat conduction problems under Robin boundary conditions by the symplectic superposition method. The Laplace transform is first employed to convert the problems to the frequency domain, and they are then transferred into the symplectic framework. The process effectively divides an original problem into two subproblems, and they are solved through the variable separation method and symplectic eigen expansion, and ultimately the solutions of the original problem are obtained through superposition. The results obtained in this study agree well those by the finite element analysis. The effects of heat convection coefficient and thermal conductivity are discussed. The present solutions are derived rigorously within the symplectic framework, without assuming any fundamental solution forms, such that more analytical solutions are attainable within the same framework.

{"title":"Analytical solutions of 2D orthotropic transient heat conduction problems under Robin boundary conditions within the symplectic framework","authors":"Jinbao Li , Dian Xu , Chaoyu Cheng, Rui Li","doi":"10.1016/j.icheatmasstransfer.2025.108694","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108694","url":null,"abstract":"<div><div>The Robin boundary conditions-based orthotropic transient heat conduction problems are frequently encountered in engineering applications, which are characterized by the coupled effect of temperature and heat flux. Although numerous attentions have been paid to this topic, the current focus is mainly on isotropic materials, and analytical solutions are still scarce due to mathematical challenges. This study presents novel analytical solutions of 2D orthotropic transient heat conduction problems under Robin boundary conditions by the symplectic superposition method. The Laplace transform is first employed to convert the problems to the frequency domain, and they are then transferred into the symplectic framework. The process effectively divides an original problem into two subproblems, and they are solved through the variable separation method and symplectic eigen expansion, and ultimately the solutions of the original problem are obtained through superposition. The results obtained in this study agree well those by the finite element analysis. The effects of heat convection coefficient and thermal conductivity are discussed. The present solutions are derived rigorously within the symplectic framework, without assuming any fundamental solution forms, such that more analytical solutions are attainable within the same framework.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108694"},"PeriodicalIF":6.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386302","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

Correlating numerical and experimental analysis for aeration in gravity driven membrane systems

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-12 DOI: 10.1016/j.icheatmasstransfer.2025.108701

Peter F.R. Beshay, Elisa Y.M. Ang, Hui An, Peng Cheng Wang

Gravity driven membrane (GDM) is an alternative over conventional high energy-consuming water filtration systems. Especially in less-privileged communities with limited access to clean water or energy resources. Here, we optimize aeration mechanism for membrane recovery for GDM. Most contributions for aeration optimization focus on high pressure membrane operation, which differs for low pressure GDM. We propose a computationally efficient numerical model to be used for predicting the performance of different aeration regimes in GDM system. Time-averaged membrane shear from simulations is found to be inversely proportional to the experimental permeability drop. After validating, we present an empirically derived equation correlating shear stress for different scenarios to the expected permeability drop for GDM. The validated numerical model could predict permeability drop from CFD shear within acceptable error. To our knowledge, this is the first attempt to derive a predictive model for such application. Prolonged test using raw water was performed for the optimized aeration regime in the GDM system and the proposed empirical equation was validated for this case. Presented results provide a guide for development of anti-fouling aeration strategies for GDM systems and highlight a cost-effective use of CFD for practical GDM system optimization through correlation with real membrane performance.

{"title":"Correlating numerical and experimental analysis for aeration in gravity driven membrane systems","authors":"Peter F.R. Beshay, Elisa Y.M. Ang, Hui An, Peng Cheng Wang","doi":"10.1016/j.icheatmasstransfer.2025.108701","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108701","url":null,"abstract":"<div><div>Gravity driven membrane (GDM) is an alternative over conventional high energy-consuming water filtration systems. Especially in less-privileged communities with limited access to clean water or energy resources. Here, we optimize aeration mechanism for membrane recovery for GDM. Most contributions for aeration optimization focus on high pressure membrane operation, which differs for low pressure GDM. We propose a computationally efficient numerical model to be used for predicting the performance of different aeration regimes in GDM system. Time-averaged membrane shear from simulations is found to be inversely proportional to the experimental permeability drop. After validating, we present an empirically derived equation correlating shear stress for different scenarios to the expected permeability drop for GDM. The validated numerical model could predict permeability drop from CFD shear within acceptable error. To our knowledge, this is the first attempt to derive a predictive model for such application. Prolonged test using raw water was performed for the optimized aeration regime in the GDM system and the proposed empirical equation was validated for this case. Presented results provide a guide for development of anti-fouling aeration strategies for GDM systems and highlight a cost-effective use of CFD for practical GDM system optimization through correlation with real membrane performance.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108701"},"PeriodicalIF":6.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395152","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

Prediction of the tube temperature and oxide scale formation of boiler superheater by a coupled combustion and hydrodynamic model

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-12 DOI: 10.1016/j.icheatmasstransfer.2025.108664

Hengyu Yin , Donghao Jin , Xin Liu , Chi Li , Xinying Li , Heyang Wang

Excessive oxide scale formation due to tube overheating is one of the major causes of boiler tube failures. Boiler tube overheating is caused by both the highly uneven gas heat flux distribution in the furnace and steam flow distribution in boiler tubes. Currently few models could predict oxide scale formation since incorporating the gas and steam flows that have huge scale difference in the same model framework presents a great challenge to such models. Therefore, this paper proposed a coupled combustion and hydrodynamic model that integrates a three-dimensional CFD model describing the gas flow and combustion processes in the furnace with a one-dimensional hydrodynamic model describing the steam flow and heat transfer processes in boiler tubes. This model was applied to predict the oxide scale formation in the platen superheater of a coal-fired boiler. The results closely agreed with the measurement data and demonstrated that tube overheating and the resultant oxide scale formation form a mutually promoted cycle that further accelerates oxide scale formation. By optimizing steam flow distribution, however, the tube temperature deviation of tube panel can be reduced from 60 °C to below 10 °C, and the growth of oxide scale can be reduced by 55 %.

{"title":"Prediction of the tube temperature and oxide scale formation of boiler superheater by a coupled combustion and hydrodynamic model","authors":"Hengyu Yin , Donghao Jin , Xin Liu , Chi Li , Xinying Li , Heyang Wang","doi":"10.1016/j.icheatmasstransfer.2025.108664","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108664","url":null,"abstract":"<div><div>Excessive oxide scale formation due to tube overheating is one of the major causes of boiler tube failures. Boiler tube overheating is caused by both the highly uneven gas heat flux distribution in the furnace and steam flow distribution in boiler tubes. Currently few models could predict oxide scale formation since incorporating the gas and steam flows that have huge scale difference in the same model framework presents a great challenge to such models. Therefore, this paper proposed a coupled combustion and hydrodynamic model that integrates a three-dimensional CFD model describing the gas flow and combustion processes in the furnace with a one-dimensional hydrodynamic model describing the steam flow and heat transfer processes in boiler tubes. This model was applied to predict the oxide scale formation in the platen superheater of a coal-fired boiler. The results closely agreed with the measurement data and demonstrated that tube overheating and the resultant oxide scale formation form a mutually promoted cycle that further accelerates oxide scale formation. By optimizing steam flow distribution, however, the tube temperature deviation of tube panel can be reduced from 60 °C to below 10 °C, and the growth of oxide scale can be reduced by 55 %.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108664"},"PeriodicalIF":6.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386303","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