International Communications in Heat and Mass Transfer最新文献

{"title":"Predictive modelling of MHD time-dependent multiphase fluid dynamics in curved corrugated channels: A small corrugations approximation approach","authors":"Jafar Hasnain ,&nbsp;Nomana Abid ,&nbsp;A.S. Alofi","doi":"10.1016/j.icheatmasstransfer.2025.109291","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109291","url":null,"abstract":"<div><div>High-performance electronic devices require precise control over fluid movement in corrugated channels. Magnetohydrodynamics effects can improve cooling efficiency. Better mixing and reaction rates can be obtained in chemical reactors having corrugated channels. By controlling the flow of reactive fluids, MHD effects can improve the effectiveness of chemical reactions. Thus, the study aims to predict the dynamics of hydromagnetic fluid flow in clear medium sandwiching porous viscous fluid under oscillatory time-dependent pressure gradient in corrugated curved channels with chemical reaction for efficient chemical processing applications. It might be helpful in the prediction of magnetic resonance-enhanced reactions and improved catalyst distribution. Moreover, corrugated walls can be used as an optimized reactor geometry. To the best of the authors' knowledge, there is no single study given on three immiscible fluids flowing through a corrugated CC in the presence of a chemical reaction. In this study, the curved channel is distributed in three regions with two interfaces. Regions-I and III are occupied with hydromagnetic viscous fluids within a clear medium whereas the middle region is filled with viscous fluid in porous media. The velocity slippage at the corrugated walls is also considered which helps the fluid to flow easily at the surface, as a result, increased separation efficiency can be achieved. The effects of curvature, Lorentz force produced by the magnetic field, porous media and velocity slippage on the flow dynamics, shear stress and volumetric flow rate are examined using analytical simulations (perturbation series method). The numerical analysis of concentration is made through the shooting technique. It is concluded that the fluid velocity, concentration and volumetric flow rate increase with higher curvature which can enhance the mixing and reaction rates, leading to improved process efficiency. When time passes, the size of velocity and circular shape of the flow pattern decreases in region III and the fluid layers move towards the lower corrugated wall of CC.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109291"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522712","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}

{"title":"Study on crystal growth and distribution characteristics of supercooling salt solution in the process of flow","authors":"Fuchun Yan ,&nbsp;Penghui Gao ,&nbsp;Kezheng Chen ,&nbsp;Bo Cheng","doi":"10.1016/j.icheatmasstransfer.2025.109285","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109285","url":null,"abstract":"<div><div>As a phase change energy storage material, salt solution ice slurry exhibits significant advantages and broad application prospects in the field of cold storage media due to its high latent heat of phase change and high heat transfer efficiency. In this study, the flow field and phase field method (PFM) were coupled, and the lattice Boltzmann method (LBM) was employed to analyze the dendrite growth and distribution characteristics of the supercooled salt solution under both static and flowing conditions. Subsequently, partial least squares (PLS) theory was utilized to analyze the weights of the factors influencing the supercooling crystallization of the solution, providing guidance and reference for understanding the crystallization solidification characteristics and state regulation of salt solution. The results indicated that when the flow velocity increased from 0.1 m/s to 0.5 m/s, the growth rate in the upstream side rose by 27 %, whereas the growth rate in the downstream side only increased by 12 %. The influence of anisotropy intensity on dendrite shape was weakened by the flow velocity. The dendrite growth rate decreased with the increase of concentration. Supercooling degree and heat flux are crucial parameters affecting ice crystal growth. As the supercooling degree and heat flux increased, supercooling crystallization of the salt solution was more likely to occur, and dendrite growth became more pronounced. This research offers scientific guidance and reference for understanding the crystallization solidification characteristics and freezing state regulation of salt solution.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109285"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522713","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}

{"title":"Numerical study on the cooling characteristic of a novel laminated cooling configuration with chained beam turbulator in an afterburner heat shield","authors":"Chengao Duan ,&nbsp;Xiaohui Bai ,&nbsp;Yuanlei Tang ,&nbsp;Ziwen Wang ,&nbsp;Cunliang Liu","doi":"10.1016/j.icheatmasstransfer.2025.109256","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109256","url":null,"abstract":"<div><div>The next-generation aircraft engine requires the development of high-efficiency laminate cooling configurations to protect afterburners. This paper proposes a novel laminated cooling configuration featuring a chained beam turbulator with annular holes. The film cooling effectiveness and the overall cooling effectiveness of the chained beam turbulator are calculated and compared with existing configurations. The effect of different parameters and temperature uniformity on the film cooling effectiveness of the chained beam turbulator is systematically researched. The results demonstrate that the novel laminated cooling configuration exhibits a higher cooling advantage. Compared to the cylindrical spoiler laminate, the surface-averaged film cooling effectiveness of the chained beam turbulator has increased by 7.0 %, while that of the existing cellular partition laminate increased by 7.1 %. The overall cooling effectiveness of the chained beam turbulator is 8.7 % higher than that of the cylindrical spoiler laminate, demonstrating the highest comprehensive cooling performance compared to other configurations. At a high momentum ratio of 0.16 (representing high-power engine operation), the uneven factor of temperature distribution of the new type laminate decreases by 2.1 %, whereas that of the cellular partition laminate reduces by 1.4 %. The average relative standard deviation of the chained beam turbulator is the lowest, which indicates that it has more superior temperature uniformity in three type laminates. Additionally, increases in the momentum ratio, distance between holes, and the end diameter of spoiler column all contribute to enhancing the heat insulating performance of the heat shield composed of the new type laminate.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109256"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522710","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}

{"title":"Numerical analysis of pulsating turbulent flow in planar and constricted channels","authors":"Liang Zhou ,&nbsp;Tieyu Gao ,&nbsp;Xiaojiang Yan ,&nbsp;Demin Liu ,&nbsp;Jianying Gong ,&nbsp;Jun Li","doi":"10.1016/j.icheatmasstransfer.2025.109260","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109260","url":null,"abstract":"<div><div>To assess the impact of separation flow on pulsating heat transfer, a numerical investigation is conducted to compare the thermal characteristics in both planar and constricted channels. The study examines steady and pulsating inlet flow conditions across a wide range of pulsation frequencies <em>l</em>_<em>s</em>⁺ = 3.2–14, providing insights into the distinct behaviors induced by separation effects. The turbulent Reynolds number <em>Re</em>_<em>τ</em> = 350 is set. Wall-resolved LES method implemented in OpenFOAM-8 is used to simulate complex flow phenomena. For the planar channel, pulsating flow enhances heat transfer by up to 7.49 % at <em>l</em>_<em>s</em>⁺ = 4.4, consistent with previous studies. Periodic changes in centerline velocity are observed, showing a 45-degree phase lag in near-wall flow behavior and wall shear stress at medium and high frequencies. In contrast, the constricted channel demonstrates over a 40 % increase in Nusselt number compared to the planar channel under steady inflow, with a maximum enhancement of 19.235 % at <em>l</em>_<em>s</em>⁺ = 4.4. Thermal performance improvement is localized at the leading edge and downstream separation region. The thermal enhancement coefficient <em>η</em> is more sensitive to pulsation in the constricted channel, increasing significantly at <em>l</em>_<em>s</em>⁺ = 3.2–14, while remaining stable in the planar channel. These findings suggest that pulsating flow, particularly at medium frequencies, offers superior performance in channels with separated flow, providing valuable insights for future engineering designs.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109260"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522709","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}

{"title":"The desorption processes of organic working fluids in metal organic frameworks and covalent organic frameworks: A molecular dynamics study","authors":"Qibin Li,&nbsp;Kai Wu","doi":"10.1016/j.icheatmasstransfer.2025.109294","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109294","url":null,"abstract":"<div><div>The heat storage capacity of working fluids can be enhanced by the conversion of thermal energy and surface energy during their adsorption and desorption processes in porous materials. However, existing studies have predominantly focused on adsorption processes, while desorption processes remain underexplored. This study employed molecular dynamics simulations to investigate the desorption properties of R32, R134a, and R1234yf in two groups of MOFs (IRMOF-1, IRMOF-16) and COFs (BF-COF-2, COF-108) with varying volume specific surface areas. The results show that the desorption capacity, desorption heat, and self-diffusion coefficient increase with temperature. For similar specific surface areas, the desorption performance of COFs is better than that of MOFs. In addition, the desorption free energy of COFs is relatively higher. Porous materials with smaller specific surface areas show greater advantages in desorption due to fewer adsorption sites. Adding 1 wt% of IRMOF-1, IRMOF-16, BF-COF-2, and COF-108 to R134a at 410 K enhanced thermal energy storage properties by 1.34 %, 5.49 %, 2.36 %, and 5.99 %, respectively. Due to the larger desorption heat of COFs, the thermal energy storage capacity of working fluids with COFs performs better than that of working fluids with MOFs at similar specific surface areas.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109294"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522708","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}

{"title":"The ceiling temperature characteristics in a tunnel under different fire locations","authors":"Jiayi Shi ,&nbsp;Kai Wang ,&nbsp;Feng Lu ,&nbsp;Jishuo Wang ,&nbsp;Rongtao Cheng","doi":"10.1016/j.icheatmasstransfer.2025.109299","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109299","url":null,"abstract":"<div><div>Current studies on tunnel fires mainly focus on central-axis fires, and the combined influence of fire elevation and transverse fire location has not been explored adequately. To address this gap, a 1:8 scale experimental campaign was conducted in an 8 m × 1 m × 1 m rectangular tunnel model with variations in fire elevation and transverse fire location. The maximum ceiling temperature rise was more than twice as responsive to the fire elevation as to the transverse fire location, highlighting the dominant role of thermal radiation feedback. Accordingly, the dimensionless temperature rise reaches an upper limit of approximately 3.2, from which a linear correlation between the dimensionless maximum ceiling temperature and heat release rate was established. By accounting for transverse fire location effects, the dimensionless model describing the maximum ceiling temperature rise was refined. Furthermore, the transverse temperature attenuation was governed primarily by the transverse fire location rather than the fire elevation, with near-to-far wall differences of up to 70 K. By incorporating a double exponential summation term into the classical single exponential attenuation model, a generalized dimensionless equation was developed to accurately predict the transverse temperature profiles for various fire locations. Comparison with existing correlations and experimental data revealed a maximum relative error below 20 %, confirming the reliability and stability of the new model.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109299"},"PeriodicalIF":6.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522707","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}

{"title":"Experimental study the effect of differences in heat transfer in different freezing directions on the distribution characteristic of trapped bubbles in ice slices","authors":"Keke Shao ,&nbsp;Mengjie Song ,&nbsp;Long Zhang ,&nbsp;Zekang Zhen ,&nbsp;Runmiao Gao ,&nbsp;Xiaoze Yu","doi":"10.1016/j.icheatmasstransfer.2025.109295","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109295","url":null,"abstract":"<div><div>Icing is common in industry and nature and always has a negative effect. To cope with ice damage, it is necessary to understand the icing mechanisms. The presence of trapped air bubbles in ice is a common phenomenon during icing, and these bubbles affect the thermal, mechanical and other physical properties of ice. To understand the distribution characteristics of trapped air bubbles in ice, a water film freezing experimental setup is built. To clarify the effect of heat transfer on trapped air bubbles, five experiments of water film freezing under different freezing directions are carried out. The results showed that both egg-shaped and needle-shaped bubbles showed a tendency to increase and then decrease as the freezing direction changed from vertically upward to vertically downward. When the freezing direction angle is 135°, the widths of the two types of bubbles reach their maximum values, which are 182.5 μm and 134.3 μm, respectively. The study helps to understand and predict the growth and distribution of trapped air bubbles in ice, which in turn can provide a reference for the optimization of de-icing and ice-breaking techniques.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109295"},"PeriodicalIF":6.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518787","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}

{"title":"Effects of tip gap height on tip convective heat (mass) transfer characteristics in turbine blade cascades of weak and strong reactions","authors":"Sok Kyu Lim,&nbsp;Hong Sik Lee,&nbsp;Sang Woo Lee","doi":"10.1016/j.icheatmasstransfer.2025.109290","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109290","url":null,"abstract":"<div><div>Effects of <em>h/s</em> (tip gap height/blade span) on heat (mass) transfer and tip near-wall flow are investigated in turbine blade cascades of exit-to-inlet velocity ratio (<em>EIVR</em>) = 1.2 (weak reaction) and 2.4 (strong reaction), by using the naphthalene sublimation technique and oil film method. They have almost same inlet flow conditions and major cascade parameters except for <em>EIVR</em>. The results show that for <em>EIVR</em> = 2.4, there are chord-wise periodic changes of tip near-wall flow and heat transfer between the leading edge and mid-chord. On the contrary, the chord-wise periodic change is hardly found for <em>EIVR</em> = 1.2. Regardless of <em>EIVR</em>, <span><math><mover><mi>Sh</mi><mo>¯</mo></mover></math></span> (area-averaged tip Sherwood number) has a tendency to increase, to have a peak, and then to decrease, with increasing <em>h/s</em>. The stronger tip leakage flow for higher <em>EIVR</em> tends (i) to augment <span><math><mover><mi>Sh</mi><mo>¯</mo></mover></math></span> and (ii) to make the increasing-decreasing tendency of <span><math><mover><mi>Sh</mi><mo>¯</mo></mover></math></span> arise in a narrower tip gap range. The ratio of <span><math><mover><mi>Sh</mi><mo>¯</mo></mover></math></span> for <em>EIVR</em> = 2.4 to that for <em>EIVR</em> = 1.2 consistently decreases with <em>h/s</em> and is finally lower than unity. However, the mass-averaged loss for <em>EIVR</em> = 2.4 is about 2.5 times as high as that for <em>EIVR</em> = 1.2, regardless of <em>h/s</em>.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109290"},"PeriodicalIF":6.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518790","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}

{"title":"Thermal performance of a heat sink (HS)-phase change material (PCM) assisted dual heat pipe (DHP) for LED cooling","authors":"Seyfi Şevik","doi":"10.1016/j.icheatmasstransfer.2025.109304","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109304","url":null,"abstract":"<div><div>This study evaluates the cooling of 30 W high-power light-emitting diodes (LEDs) using a configuration of LED-heat sink (HS), phase change material (PCM), and dual heat pipe (DHP). Furthermore, it aims to recover HS and DHP from abandoned computers, reduce the thermal resistance between the LED junction and the surrounding air, significantly enhance heat dissipation efficiency, and protect luminous flux. Results show that the average thermal resistance (<em>Rth</em>) values for natural convection and forced convection, measured by the PCM-HS-DHP, were 3.50 and 3.22 °C/W, respectively. LED's maximum junction temperature (T_j,max) is below 113.9 °C and 104.4 °C in natural convection and forced convection, respectively, which meets the requirement of the LED operating below 120 °C. The luminous flux in the forced convection was 3.19 % higher than that in the natural convection, attributed to a lower T_j,max of 8.34 % due to increased heat transfer. This means extending the LED's lifespan. The enhancement ratio (<em>ER</em>) and reduction ratio (<em>RR</em>) values of 2.54 and 5.54, respectively, showed promising outcomes. Reducing the power of the LED, increasing the air velocity, arranging the DHP to draw heat directly from the entire PCM pool or HS base, and increasing the PCM volume can provide better performance and lower T_j,max.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109304"},"PeriodicalIF":6.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518803","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}

{"title":"Heat transfer enhancement by flow control with baffle optimization in vertical wall PCM","authors":"Yun Young Ji ,&nbsp;Dong Kee Sohn ,&nbsp;Han Seo Ko","doi":"10.1016/j.icheatmasstransfer.2025.109261","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109261","url":null,"abstract":"<div><div>The aim of this study was to improve heat transfer through flow control via optimized baffles with a gap in a PCM vertical wall system. Numerical simulation, performed for the baffles by varying the height of the PCM section and the gap length, was validated by experimental results. Analysis of the height of the PCM section with 1.5 mm gap showed that single enhanced circulation for each section reduces thermal stratification in the case of small section height, compared to the divided circulation in large section height. The divided flow includes circulation in the molten zone. In the fully molten zone, the temperature gradient was small, and the heat transfer rate was low, compared to those of the partially molten zone. For variations in gap length, the (1.5 and 2) mm gap cases increased the heat transfer rate, while larger gaps resulted in low heat transfer rate by weakened circulating flow. The 21 mm section height and 1.5 mm gap length showed the highest energy absorption rate. The results showed that efficient heat transfer to the PCM could be achieved by applying optimized baffles with a gap that could control the circulating flow and maximize the heat transfer.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109261"},"PeriodicalIF":6.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518788","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}