International Communications in Heat and Mass Transfer最新文献_第2页

Multi-task image-based deep learning for boiling analysis: Material recognition and heat flux prediction

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-24 DOI: 10.1016/j.icheatmasstransfer.2025.108763

Mengqi Wu , Nan Gui , Xingtuan Yang , Jiyuan Tu , Shengyao Jiang

Pool boiling, a fundamental heat transfer process, has been extensively studied due to its importance in various industrial applications. This paper presents a multi-task deep learning model for simultaneous material recognition and heat flux quantification from boiling process images, providing a resource-efficient solution for engineering applications requiring precise thermal analysis. The proposed model utilizes a shared feature extraction backbone with attention-enhanced convolutional blocks and a multi-task output head to jointly handle material classification and heat flux regression tasks within a single framework. A weighted loss function is incorporated to balance the learning dynamics between tasks, enabling optimized performance for both material classification and heat flux quantification. Experimental results demonstrate the model's high accuracy in both tasks, with a material recognition accuracy of 100 % and a mean absolute error (MAE) of 0.094 W/cm² for heat flux prediction, underscoring its reliability for practical deployment in real-time, accurate thermal monitoring and analysis. Future work will explore integrating multi-modal data, such as acoustic data, to further improve predictive performance and broaden the model's applicability in complex thermal environments.

{"title":"Multi-task image-based deep learning for boiling analysis: Material recognition and heat flux prediction","authors":"Mengqi Wu , Nan Gui , Xingtuan Yang , Jiyuan Tu , Shengyao Jiang","doi":"10.1016/j.icheatmasstransfer.2025.108763","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108763","url":null,"abstract":"<div><div>Pool boiling, a fundamental heat transfer process, has been extensively studied due to its importance in various industrial applications. This paper presents a multi-task deep learning model for simultaneous material recognition and heat flux quantification from boiling process images, providing a resource-efficient solution for engineering applications requiring precise thermal analysis. The proposed model utilizes a shared feature extraction backbone with attention-enhanced convolutional blocks and a multi-task output head to jointly handle material classification and heat flux regression tasks within a single framework. A weighted loss function is incorporated to balance the learning dynamics between tasks, enabling optimized performance for both material classification and heat flux quantification. Experimental results demonstrate the model's high accuracy in both tasks, with a material recognition accuracy of 100 % and a mean absolute error (MAE) of 0.094 W/cm<sup>2</sup> for heat flux prediction, underscoring its reliability for practical deployment in real-time, accurate thermal monitoring and analysis. Future work will explore integrating multi-modal data, such as acoustic data, to further improve predictive performance and broaden the model's applicability in complex thermal environments.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108763"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474229","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 study on melting-solidification cycle of phase change energy storage unit: Role of fin and metal foam hybrid structure

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-24 DOI: 10.1016/j.icheatmasstransfer.2025.108776

Xinyu Huang , Zhao Du , Junfei Guo , Yuan Xie , Xiaohu Yang , Bengt Sundén

The low thermal conductivity inherent to phase change materials (PCMs) presents challenges for implementing phase change energy storage (PCES) technologies. In this study, the enhanced heat transfer properties of 9 fins, copper metal foam with 0.98 porosity-10 PPI, and fin-metal foam composite structures are compared with pure PCM structures in square PCES units. The charging and discharging process of four structures in a complete heat storage and release cycle is studied by numerical simulation. Firstly, feasibility analysis and experimental verification are carried out to verify the accuracy of the numerical model. Then, the liquid phase behavior, temperature gradient and energy storage/release performance of the four PCES structures are compared. The results show that the fin-metal foam composite structure can further improve the phase transition rate compared with a single enhanced heat transfer measure. During melting and solidification, the storage period and release period of PCM structure are shortened by 83.91 % and 96.38 % respectively. At the end of the charging and discharging process, the average heat storage and heat release rate of the composite structure are 466.40 % and 24.91 times higher than that of the pure PCM structure, respectively. However, due to the use of fin-metal foam, the amount of heat absorption and release in the phase change material is reduced by 9.08 % and 5.89 %.

{"title":"Numerical study on melting-solidification cycle of phase change energy storage unit: Role of fin and metal foam hybrid structure","authors":"Xinyu Huang , Zhao Du , Junfei Guo , Yuan Xie , Xiaohu Yang , Bengt Sundén","doi":"10.1016/j.icheatmasstransfer.2025.108776","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108776","url":null,"abstract":"<div><div>The low thermal conductivity inherent to phase change materials (PCMs) presents challenges for implementing phase change energy storage (PCES) technologies. In this study, the enhanced heat transfer properties of 9 fins, copper metal foam with 0.98 porosity-10 PPI, and fin-metal foam composite structures are compared with pure PCM structures in square PCES units. The charging and discharging process of four structures in a complete heat storage and release cycle is studied by numerical simulation. Firstly, feasibility analysis and experimental verification are carried out to verify the accuracy of the numerical model. Then, the liquid phase behavior, temperature gradient and energy storage/release performance of the four PCES structures are compared. The results show that the fin-metal foam composite structure can further improve the phase transition rate compared with a single enhanced heat transfer measure. During melting and solidification, the storage period and release period of PCM structure are shortened by 83.91 % and 96.38 % respectively. At the end of the charging and discharging process, the average heat storage and heat release rate of the composite structure are 466.40 % and 24.91 times higher than that of the pure PCM structure, respectively. However, due to the use of fin-metal foam, the amount of heat absorption and release in the phase change material is reduced by 9.08 % and 5.89 %.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108776"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480134","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

Double diffusion heat convection of a porous enclosure loaded with nano-encapsulated phase change materials

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-24 DOI: 10.1016/j.icheatmasstransfer.2025.108764

Abed Mourad , Naim Hocine , Aissa Abderrahmane , Obai Younis , Riadh Marzouki

No doubt that the recovery of the wasted heat and the maximizing of heat transmission rates are of great interest to engineers and scientists due to their direct impact on global warming. In this article, The thermal efficiency of a Latent Heat Storage (LHS) system was numerically studied with the aim of augmenting its performance. The Double-diffusive convection of Nano-encapsulated phase change material (NEPCM), confined in an annulus between an inner Koch snowflake cylinder and an outer hexagon, is considered and analyzed. A key contribution of this study is the application of a stabilized Galerkin finite element method)GFEM(for numerical modeling. The study spans a broad range of parameters, including Rayleigh numbers (Ra = 10³ to 10⁶), Darcy parameters (Da = 10⁻² to 10⁻⁵), Lewis numbers (Le = 0.1 to 5), and the inner cylinder shape (triangle, Koch snowflake). The results are presented in the form of streamlines, isotherms and heat capacity ratio (Cr). The findings suggested that increasing Ra and Da significantly augmented the heat transfer rates, while the impact of Le was less important. At the highest studied Ra, increasing Da to 10⁻⁵ and improved heat transmission rate by 160 %, whereas it decreased by 22 % when Le increased to 5. Moreover, it was noted that the triangular body has a better heat transmission rate in comparison with the other two bodies. The triangular shape resulted in a 116 % increment in the heat transmission rate compared to the snowflake shape.

{"title":"Double diffusion heat convection of a porous enclosure loaded with nano-encapsulated phase change materials","authors":"Abed Mourad , Naim Hocine , Aissa Abderrahmane , Obai Younis , Riadh Marzouki","doi":"10.1016/j.icheatmasstransfer.2025.108764","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108764","url":null,"abstract":"<div><div>No doubt that the recovery of the wasted heat and the maximizing of heat transmission rates are of great interest to engineers and scientists due to their direct impact on global warming. In this article, The thermal efficiency of a Latent Heat Storage (LHS) system was numerically studied with the aim of augmenting its performance. The Double-diffusive convection of Nano-encapsulated phase change material (NEPCM), confined in an annulus between an inner Koch snowflake cylinder and an outer hexagon, is considered and analyzed. A key contribution of this study is the application of a stabilized Galerkin finite element method)GFEM(for numerical modeling. The study spans a broad range of parameters, including Rayleigh numbers (<em>Ra</em> = 10<sup>3</sup> to 10<sup>6</sup>), Darcy parameters (<em>Da</em> = 10<sup>−2</sup> to 10<sup>−5</sup>), Lewis numbers (<em>Le</em> = 0.1 to 5), and the inner cylinder shape (triangle, Koch snowflake). The results are presented in the form of streamlines, isotherms and heat capacity ratio (Cr). The findings suggested that increasing <em>Ra</em> and <em>Da</em> significantly augmented the heat transfer rates, while the impact of <em>Le</em> was less important. At the highest studied Ra, increasing Da to 10<sup>−5</sup> and improved heat transmission rate by 160 %, whereas it decreased by 22 % when Le increased to 5. Moreover, it was noted that the triangular body has a better heat transmission rate in comparison with the other two bodies. The triangular shape resulted in a 116 % increment in the heat transmission rate compared to the snowflake shape.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108764"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480133","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

Oil-CO2 phase behavior in nanoporous media: A lattice Boltzmann study

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-24 DOI: 10.1016/j.icheatmasstransfer.2025.108738

Han Wang , Qinjun Kang , Wendong Wang , Wu He , Yuxuan Xia , Jianchao Cai

The complex phase behaviors of oil-CO₂ immiscible diffusion and oil swelling in shale nanoscale space under the influence of competitive adsorption caused by fluid-solid interaction force are still unclear, which is significantly important for shale oil recovery and carbon sequestration. In this paper, a multi-relaxation-time lattice Boltzmann method integrating the two-phase two-component three-distribution Shan-Chen flow model and mass transfer model is established to simulate the CO₂ diffusion through immiscible phase interfaces, oil-dissolved CO₂ competitive adsorption on the mineral surfaces, and oil swelling in nanoporous media. The proposed model is verified by the microfluidic experiment to successfully capture the diffusion and swelling. Then, the effects of equilibrium dissolution concentration and competitive adsorption on CO₂ diffusion/dissolution and oil swelling are studied. The results show that as the equilibrium dissolution concentration increases, the dissolution rate of CO₂ is accelerated, resulting in the increase of oil swelling volume and the dissolved CO₂ adsorption concentration. The mass of CO₂ diffusing into the oil phase increases with CO₂ adsorption capacity, but the oil swelling volume decreases because of the increased CO₂ adsorption on mineral surfaces.

{"title":"Oil-CO2 phase behavior in nanoporous media: A lattice Boltzmann study","authors":"Han Wang , Qinjun Kang , Wendong Wang , Wu He , Yuxuan Xia , Jianchao Cai","doi":"10.1016/j.icheatmasstransfer.2025.108738","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108738","url":null,"abstract":"<div><div>The complex phase behaviors of oil-CO<sub>2</sub> immiscible diffusion and oil swelling in shale nanoscale space under the influence of competitive adsorption caused by fluid-solid interaction force are still unclear, which is significantly important for shale oil recovery and carbon sequestration. In this paper, a multi-relaxation-time lattice Boltzmann method integrating the two-phase two-component three-distribution Shan-Chen flow model and mass transfer model is established to simulate the CO<sub>2</sub> diffusion through immiscible phase interfaces, oil-dissolved CO<sub>2</sub> competitive adsorption on the mineral surfaces, and oil swelling in nanoporous media. The proposed model is verified by the microfluidic experiment to successfully capture the diffusion and swelling. Then, the effects of equilibrium dissolution concentration and competitive adsorption on CO<sub>2</sub> diffusion/dissolution and oil swelling are studied. The results show that as the equilibrium dissolution concentration increases, the dissolution rate of CO<sub>2</sub> is accelerated, resulting in the increase of oil swelling volume and the dissolved CO<sub>2</sub> adsorption concentration. The mass of CO<sub>2</sub> diffusing into the oil phase increases with CO<sub>2</sub> adsorption capacity, but the oil swelling volume decreases because of the increased CO<sub>2</sub> adsorption on mineral surfaces.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108738"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480130","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 study of droplets impacting on flat and cone-arrayed surfaces

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-22 DOI: 10.1016/j.icheatmasstransfer.2025.108729

Jinggang Zhang , Wei Zhao , Haihu Liu , Dong Wang , Haihang Cui , Li Chen

The dynamic behaviour of droplets impacting on both flat and cone-arrayed microstructural surfaces is investigated using an improved colour-gradient lattice Boltzmann method. We first study the effect of the Reynolds number (

Re

) on the dynamic behaviour of the impacting droplet by fixing the Weber number (

We

) at 10. As

Re

increases, the maximum dimensionless mass centroid of the droplet (

{z_{cmax}}^{*}

) for the droplet impact on a cone-arrayed surface is first larger and then smaller than that on a flat surface, indicating that the cone-arrayed surface changes from promoting to preventing the rebound of the droplet from the solid surface. Next, the effect of

We

on the dynamic behaviour of the impacting droplet is studied by fixing

Re = 350

. For the droplet impact on a flat surface,

{z_{cmax}}^{*}

first increases and then decreases with increasing

We

, and its maximum value is reached near

We = 20

. For the droplet impact on a cone-arrayed surface,

{z_{cmax}}^{*}

monotonically decreases with increasing

We

. Finally, the study concludes with phase diagrams that illustrate how the droplet rebound patterns and maximum rebound height vary with

Re

and

We

, providing valuable insights for optimizing textured surface designs in applications requiring precise droplet control.

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引用次数: 0

Coupling effect of substrate thermal properties and droplet geometry on Marangoni instabilities inside an evaporating droplet at quasi-steady state

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-21 DOI: 10.1016/j.icheatmasstransfer.2025.108745

Tianshi Wang , Jintao Chen , Xiaomin Kang , Jinglan Zou , Yanan Zou , Wan-Yuan Shi

Although extensive researches have been conducted into influences of substrate thermal properties on droplet evaporation, few of them were aimed on the instabilities of their internal flow. In this paper, flow fields of Marangoni instabilities inside an evaporating droplet are simulated by a three-dimensional one-sided model, with considering the coupling effect of substrate thermal properties and droplet geometrical shape. Results shows that a large relative thermal conductivity and a larger droplet contact angle favor the appearance of hydrothermal waves. Hydrothermal waves of fan-like configurations are transformed to irregular hydrothermal waves with evaporation. With a decrease of the contact angle, instability patterns of hydrothermal waves, coexistence of hydrothermal waves and longitudinal rolls, stationary longitudinal roll, irregular Bénard-Marangoni convection were generated in sequence. Nonetheless, a small relative thermal conductivity suppresses the emergency of hydrothermal waves, with longitudinal rolls coexisting with Bénard-Marangoni cells. Longitudinal rolls propagate towards the cold side along the droplet circumference, concurrently with Bénard-Marangoni cells exhibiting a direct movement towards the cold side. Influences of droplet contact angle, substrate temperature, and relative thermal conductivity on characteristics of the observed instability patterns were systematically analyzed. This research facilitates a deeper understanding of the substrate thermal impacts on Marangoni instabilities within droplets.

{"title":"Coupling effect of substrate thermal properties and droplet geometry on Marangoni instabilities inside an evaporating droplet at quasi-steady state","authors":"Tianshi Wang , Jintao Chen , Xiaomin Kang , Jinglan Zou , Yanan Zou , Wan-Yuan Shi","doi":"10.1016/j.icheatmasstransfer.2025.108745","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108745","url":null,"abstract":"<div><div>Although extensive researches have been conducted into influences of substrate thermal properties on droplet evaporation, few of them were aimed on the instabilities of their internal flow. In this paper, flow fields of Marangoni instabilities inside an evaporating droplet are simulated by a three-dimensional one-sided model, with considering the coupling effect of substrate thermal properties and droplet geometrical shape. Results shows that a large relative thermal conductivity and a larger droplet contact angle favor the appearance of hydrothermal waves. Hydrothermal waves of fan-like configurations are transformed to irregular hydrothermal waves with evaporation. With a decrease of the contact angle, instability patterns of hydrothermal waves, coexistence of hydrothermal waves and longitudinal rolls, stationary longitudinal roll, irregular Bénard-Marangoni convection were generated in sequence. Nonetheless, a small relative thermal conductivity suppresses the emergency of hydrothermal waves, with longitudinal rolls coexisting with Bénard-Marangoni cells. Longitudinal rolls propagate towards the cold side along the droplet circumference, concurrently with Bénard-Marangoni cells exhibiting a direct movement towards the cold side. Influences of droplet contact angle, substrate temperature, and relative thermal conductivity on characteristics of the observed instability patterns were systematically analyzed. This research facilitates a deeper understanding of the substrate thermal impacts on Marangoni instabilities within droplets.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108745"},"PeriodicalIF":6.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454389","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

Optimization of magnetohydrodynamic flow in a sudden expansion channel: Effects of Hartmann and Reynolds number on pressure and velocity dynamics

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-21 DOI: 10.1016/j.icheatmasstransfer.2025.108746

Rupesh Baroniya, Manoj Arya

This research investigates the optimization of magnetohydrodynamic (MHD) flow in a sudden expansion channel using response surface methodology. The study focuses on the effects of Hartmann number (Ha) and Reynolds number (Re) on pressure drop and velocity dynamics. The numerical investigation was conducted using a robust 3D MHD solver called ANUPRAVAHA, developed by researchers at IIT Guwahati and IIT Kanpur, across a range of Hartmann numbers (10−100) and Reynolds numbers (100–500), and results were optimized using response surface methodology. Key findings include the development of mathematical models that effectively captures the nonlinear relationships between Hartmann number, Reynolds number and critical flow parameters: pressure drop, maximum velocity, and outlet velocity. Mathematical models were created to predict these flow parameters, showing high accuracy when validated against numerical results. The effectiveness of the model is further validated by prediction errors of less than 1.899 % for all response variables. Response surface methodology (RSM) optimization identified the optimal conditions for balancing pressure drop, maximum velocity, and outlet velocity at Ha = 76.83 and Re = 500, with a desirability score of 0.963. The analysis reveals that while Reynolds number has a stronger impact on pressure drop, Hartmann number's quadratic and cubic terms significantly impact the maximum velocity within the channel. The results also show that increasing Hartmann number leads to a higher pressure drop and nonlinear changes in velocity distribution, whereas higher Reynolds number generally increases maximum and outlet velocities.

{"title":"Optimization of magnetohydrodynamic flow in a sudden expansion channel: Effects of Hartmann and Reynolds number on pressure and velocity dynamics","authors":"Rupesh Baroniya, Manoj Arya","doi":"10.1016/j.icheatmasstransfer.2025.108746","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108746","url":null,"abstract":"<div><div>This research investigates the optimization of magnetohydrodynamic (MHD) flow in a sudden expansion channel using response surface methodology. The study focuses on the effects of Hartmann number (<em>Ha</em>) and Reynolds number (<em>Re</em>) on pressure drop and velocity dynamics. The numerical investigation was conducted using a robust 3D MHD solver called ANUPRAVAHA, developed by researchers at IIT Guwahati and IIT Kanpur, across a range of Hartmann numbers (10−100) and Reynolds numbers (100–500), and results were optimized using response surface methodology. Key findings include the development of mathematical models that effectively captures the nonlinear relationships between Hartmann number, Reynolds number and critical flow parameters: pressure drop, maximum velocity, and outlet velocity. Mathematical models were created to predict these flow parameters, showing high accuracy when validated against numerical results. The effectiveness of the model is further validated by prediction errors of less than 1.899 % for all response variables. Response surface methodology (RSM) optimization identified the optimal conditions for balancing pressure drop, maximum velocity, and outlet velocity at <em>Ha</em> = 76.83 and <em>Re</em> = 500, with a desirability score of 0.963. The analysis reveals that while Reynolds number has a stronger impact on pressure drop, Hartmann number's quadratic and cubic terms significantly impact the maximum velocity within the channel. The results also show that increasing Hartmann number leads to a higher pressure drop and nonlinear changes in velocity distribution, whereas higher Reynolds number generally increases maximum and outlet velocities.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108746"},"PeriodicalIF":6.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454395","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

Simulation and prediction of multisource/sink behaviours of VOCs emitted from building materials

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-21 DOI: 10.1016/j.icheatmasstransfer.2025.108750

Yuan Ma , Zhongbao Guo , Yan Zhang , Jiemin Liu , Hongyan Guan , Xuemei Dong

Indoor air pollution can be determined collectively by volatile organic compounds (VOCs) emitted from all decoration materials. Existing studies on the multisource emissions of VOC are primarily based on adding up the amounts of individual emission, which has significant limitations. In this study, a new multisource mass transfer model was developed. Wall paint, wooden decorative panels and leather were selected for experiments on VOC emissions from single and multiple sources. Numerical simulations were performed, demonstrating favourable alignment with the experimental data. Research has found that leather can adsorb VOCs released from other building materials, which changes the pattern of multisource releases of VOC compared to the emission patterns observed when the materials are tested individually. However, once the VOCs adsorbed onto the leather surface become saturated, they may subsequently desorb, resulting in secondary contamination of the indoor air. Additionally, simulation results of multisource experiments with different types of building materials without adsorption characteristics reveal that as long as the types of pollutants released from the materials are different, the VOC emissions from each material do not interfere with one another. The conclusions of this research can provide a theoretical reference for formulating strategies to prevent and control indoor air pollution.

{"title":"Simulation and prediction of multisource/sink behaviours of VOCs emitted from building materials","authors":"Yuan Ma , Zhongbao Guo , Yan Zhang , Jiemin Liu , Hongyan Guan , Xuemei Dong","doi":"10.1016/j.icheatmasstransfer.2025.108750","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108750","url":null,"abstract":"<div><div>Indoor air pollution can be determined collectively by volatile organic compounds (VOCs) emitted from all decoration materials. Existing studies on the multisource emissions of VOC are primarily based on adding up the amounts of individual emission, which has significant limitations. In this study, a new multisource mass transfer model was developed. Wall paint, wooden decorative panels and leather were selected for experiments on VOC emissions from single and multiple sources. Numerical simulations were performed, demonstrating favourable alignment with the experimental data. Research has found that leather can adsorb VOCs released from other building materials, which changes the pattern of multisource releases of VOC compared to the emission patterns observed when the materials are tested individually. However, once the VOCs adsorbed onto the leather surface become saturated, they may subsequently desorb, resulting in secondary contamination of the indoor air. Additionally, simulation results of multisource experiments with different types of building materials without adsorption characteristics reveal that as long as the types of pollutants released from the materials are different, the VOC emissions from each material do not interfere with one another. The conclusions of this research can provide a theoretical reference for formulating strategies to prevent and control indoor air pollution.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108750"},"PeriodicalIF":6.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454392","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

Anisotropic heat conduction in composite rectangular fins: A theoretical analysis and optimal design

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-21 DOI: 10.1016/j.icheatmasstransfer.2025.108756

Zhiwei Liu , Guoqiang Xu , Bensi Dong , Jie Wen , Laihe Zhuang

In pursuit of higher aero-engine performance, fins are designed to meet extremely high-temperature tolerance. With excellent properties including low density, high thermal resistance and corrosion resistance, ceramic matrix composites (CMCs) have been widely used as promising thermal structure materials. The presence of fiber angle in composites results in the directionality of thermal conductivity, which limits the application of analysis and optimization methods developed based on isotropic fins. The analysis considers heat conduction in both the fin height (H) and thickness (δ) directions involving the mixed partial derivatives of temperature in the differential equation. The boundary conditions take into account the heat convection between the fin and the fluid as well as the adiabatic fin tip. The equations are solved using the integral method and Taylor expansion to obtain the fin efficiency and temperature field. Good agreement is observed between our analytical and numerical results demonstrated with the maximum relative deviation of 7.03 % for the fin efficiency and − 12.26 % for the dimensionless excess temperature. According to the proposed solution, the equivalent thermal conductivity is derived to broaden the universality of the previous fin optimization formula, which lays solid foundations for a deep understanding of the heat conduction process in anisotropic fins.

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引用次数: 0

Establishment and analysis of a new steady-state operation model of loop heat pipe

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer

Pub Date : 2025-02-21 DOI: 10.1016/j.icheatmasstransfer.2025.108754

Kangning Xiong , Yitong Chen , Wenjuan Zhang , Shuangfeng Wang

In this study, an original loop heat pipe (LHP) was used as the physical model. Based on the variable conductivity mode (VCM) and constant conductivity mode (CCM) of LHP, a steady-state mathematical model of the LHP was established, and the operational characteristics of the LHP were simulated by this mathematical model. The simulated results indicated that the mathematical model can accurately assess the operational temperature of the LHP with a flat evaporator. As the heat input increased, the length ratio and length of two-phase region in the condensation line, and the pressure drop of each component of LHP increased gradually. When the heat input was 750 W, the length of the two-phase region in the condensation line was 230.5 mm, which accounted for 42.3 % of the total length of the condensation line. The pressure drop of the condensation line was the highest in the entire heat input range from 50 W to 750 W compared to other components of the LHP. The ratio of heat leak to heat input decreased with the increasing of heat input. The largest ratio of heat leak to heat input of 5.93 % was obtained at the heat input of 50 W.

{"title":"Establishment and analysis of a new steady-state operation model of loop heat pipe","authors":"Kangning Xiong , Yitong Chen , Wenjuan Zhang , Shuangfeng Wang","doi":"10.1016/j.icheatmasstransfer.2025.108754","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108754","url":null,"abstract":"<div><div>In this study, an original loop heat pipe (LHP) was used as the physical model. Based on the variable conductivity mode (VCM) and constant conductivity mode (CCM) of LHP, a steady-state mathematical model of the LHP was established, and the operational characteristics of the LHP were simulated by this mathematical model. The simulated results indicated that the mathematical model can accurately assess the operational temperature of the LHP with a flat evaporator. As the heat input increased, the length ratio and length of two-phase region in the condensation line, and the pressure drop of each component of LHP increased gradually. When the heat input was 750 W, the length of the two-phase region in the condensation line was 230.5 mm, which accounted for 42.3 % of the total length of the condensation line. The pressure drop of the condensation line was the highest in the entire heat input range from 50 W to 750 W compared to other components of the LHP. The ratio of heat leak to heat input decreased with the increasing of heat input. The largest ratio of heat leak to heat input of 5.93 % was obtained at the heat input of 50 W.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"163 ","pages":"Article 108754"},"PeriodicalIF":6.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454394","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