International Journal of Heat and Mass Transfer最新文献

{"title":"Generalized physics-based cavitation model encompassing multiple cavitation regimes","authors":"Lester Toledo ,&nbsp;Kyungjun Choi ,&nbsp;Hyunji Kim ,&nbsp;Chongam Kim","doi":"10.1016/j.ijheatmasstransfer.2025.126898","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126898","url":null,"abstract":"<div><div>Accurate modeling of multiple cavitation regimes and their thermodynamic effects remains a challenge. This study extends the baseline physics-based cavitation model to a generalized form, encompassing the inertial, intermediate, and thermal cavitation regimes including the extreme thermal regime at very low Jakob number. For this purpose, a single bubble growth rate that is valid over a broad range of Jakob number is formulated. The dynamics of intermediate regime is captured by employing local pressure and temperature conditions. Key physical corrections for the bubble growth initiation, time delay, and growth acceleration are taken into account. The proposed cavitation model is then carefully validated and critically assessed with a series of test cases including homogeneous bubble growth over multiple cavitation regimes, cryogenic and isothermal cavitating flows. The bubble growth tests confirm its superior performance, particularly in the intermediate regime, and yield an excellent agreement with the experimental bubble growth curve over the entire bubble growth regime. Other computed results also show accurate capturing of cavitation features and thermal effects, demonstrating its utility in a wide range of operation conditions. Especially, the physical mechanism of multiple bubble pulsations is unveiled by analyzing the contribution of bubble growth rate from each cavitation regime.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126898"},"PeriodicalIF":5.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641725","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 of the condensing heat transfer characteristics in a circular tube bank fin air cooler and the comparison to a flat tube bank fin air cooler","authors":"Shi-Qiang Zhu ,&nbsp;Liang-Bi Wang ,&nbsp;Xin Na ,&nbsp;Zhi-Min Lin ,&nbsp;Xiao-E Zhang","doi":"10.1016/j.ijheatmasstransfer.2025.126974","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126974","url":null,"abstract":"<div><div>The direct air-cooling technology employed in power plants offers significant potential for conserving water resource. The condensing heat transfer characteristics in the tubes of air cooler are crucial, and such condensation is enforced by air flow. Now most air-cooling islands of power plant use finned flat tube instead of finned circular tube or circular tube bank fin air cooler (CTBFAC) to decrease the air flow pressure drop. This paper performs an experimental study of the condensing heat transfer characteristics in a CTBFAC. The condensing heat transfer characteristics of the CTBFAC are compared to that of the flat tube bank fin air cooler (FTBFAC). The main experimental results demonstrate that: air flow rate plays a vital role in condensation heat transfer, there are strong coupling correlations between the tube side liquid/steam Reynolds number (<em>Re</em>_LS/<em>Re</em>_s), Nusselt number (<em>Nu</em>_s) and the air side Reynolds number (<em>Re</em>_a): <em>Re</em>_LS = 0.748<em>Re</em>_a^0.759 (1−<em>β</em>/180)^−0.169, <em>Re</em>_s = 12.704<em>Re_a</em>^0.760 (1−<em>β</em>/180)^−0.162, <em>Nu</em>_s = 1.510<em>Re</em>_a^0.455 (1−<em>β</em>/180)^−0.216, within the range of <em>Re</em>_a from 295 to 1100 and the range of inclination angle (<em>β</em>) from 30° to 90°. At the same <em>Re</em>_LS/<em>Re</em>_s, <em>Nu</em>_s of the CTBFAC is significantly higher than that of the FTBFAC.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126974"},"PeriodicalIF":5.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636572","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 analyses of flow boiling heat transfer on downward-facing surface at low inclination: Critical heat flux and vapor bubble dynamics","authors":"Min Suk Lee ,&nbsp;Hyoung Suk Yu ,&nbsp;Jun Yeong Jung ,&nbsp;Dong Hoon Kam ,&nbsp;Yong Hoon Jeong","doi":"10.1016/j.ijheatmasstransfer.2025.126960","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126960","url":null,"abstract":"<div><div>Numerous studies on critical heat flux (CHF) on a downward-facing heating surface in a low inclination channel have been reported, yet a profound understanding of CHF is still lacking under these conditions, which reflect the optimized design of thermal systems with a large surface that manage a large amount of heat. Flow boiling experiments were conducted in this work to evaluate boiling heat transfer and CHF with a downward-facing heating surface and very low inclination (10°) flow channel. The experimental conditions in this study were determined from the configuration of the core catcher as a representative system utilizing the flow boiling phenomenon on a 10° inclined large heating surface. Mass flux and subcooling effects on boiling heat transfer and CHF were evaluated, and analyses were performed on the heater and fluid temperature measurement results. Furthermore, an optical probe with two fiber sensor tips and a high-speed camera were used to estimate the vapor bubble characteristics. Results indicate that CHF increases with increasing mass flux and subcooling, while other distinct phenomena were observed including an overheated fluid region around the heater surface, condensation-induced water hammer events under 15 K subcooling, and converged local void fraction near the CHF.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126960"},"PeriodicalIF":5.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636571","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":"Development of conduction optimized heat sinks with enhanced fluid flow path for passive cooling applications","authors":"Huanyu Zhao ,&nbsp;Hanyang Ye ,&nbsp;Huaxu Liang ,&nbsp;Pengfei Liu ,&nbsp;Yugo Asai ,&nbsp;Hideaki Miyamoto ,&nbsp;Ryo Kajitani ,&nbsp;Tsutomu Sakata ,&nbsp;Jin Yao Ho","doi":"10.1016/j.ijheatmasstransfer.2025.126963","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126963","url":null,"abstract":"<div><div>Passive cooling, which utilizes natural convection and thermal radiation as the heat removal mechanisms, offers the advantages of high reliability, compactness, noise-free and low-energy-cost for thermal management of electronics. Unfortunately, existing passive heat sinks have limited geometrical variation to take advantage of the heat dissipation mechanisms, leading to large air flow paths and conduction resistances. To overcome these shortcomings of conventional passive heat sink designs, this study proposes three categories of passive heat sinks including parameter optimized cross-shaped plate fins (CF), topology optimized tree-shaped fins (TF) and hybridized cross-shaped and tree-shaped fins (CF-TF). While the CF heat sinks aim to reduce the air flow resistance to increase the average air velocity in the heat sinks and the TF heat sinks simultaneously reduce the fin conduction resistance and increase the wetted area for enhanced heat transfer, the CF-TF heat sinks synergize the advantages of both CF and TO topology to further enhance cooling performance. Using selective laser melting (SLM), a laser powder bed fusion (LPBF) process, we showed that the complex geometries of the heat sinks can be readily fabricated with short production time and at low cost, thus demonstrating the potential of utilizing LPBF for full scale production for these heat sinks. Furthermore, using Fourier transform infrared spectroscopy (FTIR), we showed that the SLM-fabricated heat sinks made from AlSi10Mg have the added advantage of significantly higher spectral emissivity, thus enhancing radiation heat dissipation as compared to conventionally casted aluminum alloy, Al6061. To evaluate the passive cooling performance of the new heat sinks, they were experimentally characterized in an environmental chamber. Our results showed that the best hybridized heat sink (CF0-TF16), cross-shaped heat sink (CF2), and topology optimized heat sink (TF16-R) exhibited 10.6 % 10.5 % and 10.0 % reduction in thermal resistance as compared to the best conventional plate fin heat sink, respectively. More importantly, the thermal enhancements of CF0-TF16, CF2 and TF16-R were achieved at the weight reductions of 14.8 %, 18.7 % and 20.7 %, respectively, as compared to the conventional heat sink. This research demonstrates the advantage of synergizing new thermal design strategy and additive manufacturing technique to develop passive cooling devices with simultaneous thermal efficiency enhancement and weight reduction.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126963"},"PeriodicalIF":5.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636449","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":"Onset of liquid films instability in microchannel flow boiling","authors":"Adam Kriz,&nbsp;Saeed Moghaddam","doi":"10.1016/j.ijheatmasstransfer.2025.126964","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126964","url":null,"abstract":"<div><div>Microchannel flow boiling is becoming increasingly important in many applications, yet its modeling has remained a challenge due to a lack of mechanistic fluid flow models, particularly for thin liquid films. In a recent study, we determined the liquid film thickness and velocity in 300-µm-wide microchannels and used the results to calculate the shear stress at the liquid-vapor interface. A graph of the shear stress versus the liquid film thickness delineated transition to wavy-annular flow regime. Here, we have extended our studies to different channel sizes and fluids, from low to high surface tension, using a combination of flow boiling and adiabatic test studies. The results show that the onset of films instability is a function of the shear stress at the liquid-vapor interface, consistent with the Kelvin-Helmholtz (K-H) instability. Various criteria for the onset of K-H instability are evaluated. The Richardson number (<em>Ri</em>) as an indicator of the onset of film instability is shown to decrease greatly for thin films in microchannels and is demonstrated to be dependent on surface tension such that Bond number, <em>Bo</em>/<em>Ri</em> for different fluids are relatively close. However, this criterion does not accurately predict the onset of instability of relatively thinner films. Further analysis suggests that Taitel and Dukler's (1976) criterion can accurately predict instability of adiabatic films. However, liquid films in boiling become unstable at a significantly lower interfacial shear stresses relative to Taitel and Dukler's prediction. Additional forces and perturbation mechanisms such as evaporative momentum effects, acoustics of nucleate boiling, and local temperature-induced surface tension variations could account for deviations relative to adiabatic films.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126964"},"PeriodicalIF":5.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636453","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":"Enhancing pool boiling with separated liquid-vapor pathways on perforated micromesh surface","authors":"Yuxuan Chen ,&nbsp;Pengkun Li ,&nbsp;Qifan Zou ,&nbsp;Xiuliang Liu ,&nbsp;Ronggui Yang","doi":"10.1016/j.ijheatmasstransfer.2025.126949","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126949","url":null,"abstract":"<div><div>Boiling heat transfer has been utilized in many industrial applications, including thermal power plants, air conditioners, and thermal management of electronics and data centers. Micro/nano-structured surfaces have been developed to enhance the key performance metrics of boiling, including heat transfer coefficient (HTC) and critical heat flux (CHF). Porous structures, such as sintered micromesh and packed micropowders, show great promise in promoting bubble nucleation. However, the conflicting requirements of HTC and CHF for surface structures make it challenging to simultaneously enhance both CHF and HTC on porous surfaces. In this work, stacked micromesh surfaces are perforated to enhance bubble nucleation, and facilitate bubble escape and liquid delivery through separated liquid and vapor pathways. Nucleated bubbles within the micromesh pores can easily escape through perforations due to low flow resistance, significantly augmenting HTC. Liquid supply is improved due to decreased obstruction of vapor bubbles in liquid pathways, leading to enhancement of CHF. Both visualization of bubble dynamics and theoretical analysis of liquid-vapor transport are conducted to demonstrate the effectiveness of perforation design for the separation of liquid and vapor transport. Significant enhancements are demonstrated on the perforated micromesh surface with a perforation spacing of 2 mm compared to a smooth copper surface, with HTC and CHF increasing by 598 % and 136 %, respectively.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126949"},"PeriodicalIF":5.0,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632007","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":"A generalized performance evaluation plot for flow resistance reduction design of heat transfer surfaces","authors":"Wanlong Jin,&nbsp;Limin Wang,&nbsp;Lei Deng,&nbsp;Gaofeng Fan,&nbsp;Defu Che","doi":"10.1016/j.ijheatmasstransfer.2025.126941","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126941","url":null,"abstract":"<div><div>The performance evaluation plot (PEP) is a visualized performance evaluation method with definite physical meaning. However, the strict constraints including property constraints, geometry constraints and operation constraints restrict the generality of PEP. The previous PEPs are oriented for heat transfer enhancement technologies. In this study, the constraints restricting the applicability of PEP are removed, and a generalized PEP for flow resistance reduction design of heat transfer surfaces is proposed. The multiple evaluation criteria including power consumption comparison under heat duty constraint, pressure drop comparison under heat duty constraint and comparison of Fanning friction factor over heat transfer rate under equal mass flow rate can be performed in the same plot. The effectivity of flow resistance reduction design can be easily determined by the position comparisons between working lines and baselines. Three intercept factors based on the developed PEP are proposed for quantitative evaluation. The accuracy and applicability of the proposed evaluation method are verified. It is reliable and practicable for evaluating the comprehensive hydraulic performance of heat transfer surfaces. The comprehensive performance comparison of printed circuit heat exchangers with rectangular and airfoil fins is presented to illustrate the application of generalized PEP.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126941"},"PeriodicalIF":5.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628017","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":"Coaxial Airflow Modulation for Cryogen Spray Cooling: Towards Heat Transfer Enhancement and Film Control in Laser Dermatology","authors":"Mohamed Qenawy ,&nbsp;Mona Ali ,&nbsp;Yiqi Chen ,&nbsp;Yuchen Zhu ,&nbsp;Si Chen ,&nbsp;Jiameng Tian ,&nbsp;Junfeng Wang ,&nbsp;Bin Chen ,&nbsp;Hengjie Guo","doi":"10.1016/j.ijheatmasstransfer.2025.126969","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126969","url":null,"abstract":"<div><div>In clinical treatment, effective cooling is crucial for avoiding skin injury, particularly for patients with higher melanin concentrations, however still recent advancements are limited by the thermal barring of the deposited liquid film or asymmetric heat transfer. Expanding upon our previous research on coaxial air-cryogen spray cooling, this study investigates the effects of converging and diverging airflow configurations to enhance heat transfer, reduce film deposition, and improve cooling uniformity. The heat flux on skin-like epoxy surface was calculated via Duhamel methodology, utilizing fast-responding thin-film thermocouple measurements. Meanwhile, the film and spray dynamics/morphologies were captured via high-speed video recording that employing Mie-scattering method, and further predicted through large eddy simulation coupled with discrete phase and Eulerian wall film modelling. The analysis of spray patterns, thermal features, and deposited film behavior reveals significant improvements in heat transfer, droplet evaporation, and film dynamics by airflow. The coaxial diameter ratio (<span><math><mrow><msub><mi>d</mi><mi>o</mi></msub><mo>/</mo><mi>d</mi></mrow></math></span>) of 1.0 and 1.5 demonstrated more effective spray dispersion, significantly influenced film dynamics during both cryogen on- and off-duties by reducing frost formation and enhanced evaporation efficiency. The <span><math><mrow><msub><mi>d</mi><mi>o</mi></msub><mo>/</mo><mi>d</mi></mrow></math></span> = 1.5 configuration achieved the best performance with higher average heat transfer coefficient and lower minimum surface temperature, offering superior heat dissipation, particularly at the spray periphery, though it had longer film resistance due to slower evaporation at the impingement point. The <span><math><mrow><msub><mi>d</mi><mi>o</mi></msub><mo>/</mo><mi>d</mi></mrow></math></span> = 1.5 and 0.5 cases showed distinct cooling patterns, with the former providing better overall cooling and heat transfer, while the latter concentrated cryogen in the impingement core, resulting in thicker films and slower evaporation. Thus, the divergent and convergent airflow designs offer superior cooling performance at the impingement point and the core region, respectively. These findings offer valuable insights for optimizing air-cryogenic spray cooling systems for precise temperature control of the skin.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126969"},"PeriodicalIF":5.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628019","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":"Examining the mass transport resistance of porous transport layers at the rib/channel scale in polymer electrolyte membrane water electrolyzers: Modeling and design","authors":"Pablo A. García-Salaberri ,&nbsp;Jack Todd Lang ,&nbsp;Hung-Ming Chang ,&nbsp;Nausir Firas ,&nbsp;Hasan Shazhad ,&nbsp;Iryna V. Zenyuk","doi":"10.1016/j.ijheatmasstransfer.2025.126889","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126889","url":null,"abstract":"<div><div>The porous transport layer (PTL) plays a relevant role in the efficiency of polymer electrolyte membrane water electrolyzers (PEMWE). Extraction of good design guidelines for this porous component is necessary for efficient water/oxygen transport. In this regard, numerical modeling provides a versatile tool to examine large parameter set and determine optimal PTL conditions to be verified experimentally. Here, a hybrid model is presented to analyze two-phase transport of oxygen and water in the anode PTL of a PEMWE. Oxygen capillary transport is modeled with a multi-cluster invasion-percolation algorithm, while water convective transport is modeled with a continuum formulation that incorporates the blockage of gas saturation. The model is validated against in-operando X-ray computed tomography data of the oxygen saturation distribution at the rib/channel scale. Subsequently, a comprehensive parametric analysis is presented, considering the following variables: ( <span><math><mi>i</mi></math></span>) PTL slenderness ratio, (<span><math><mrow><mi>i</mi><mi>i</mi></mrow></math></span>) flow-field open area fraction, (<span><math><mrow><mi>i</mi><mi>i</mi><mi>i</mi></mrow></math></span>) PTL isotropy, (<span><math><mrow><mi>i</mi><mi>v</mi></mrow></math></span>) PTL average pore radius, and (<span><math><mi>v</mi></math></span>) PTL pore-size heterogeneity. Among other conclusions, the results show that the water transport resistance under the rib can lead to non-negligible mass transport losses at high current density. Water transport from the channel to the catalyst layer can be promoted by: (<span><math><mi>i</mi></math></span>) the use of PTLs with a slenderness ratio, defined as the PTL thickness to rib half-width ratio, around 0.5, (<span><math><mrow><mi>i</mi><mi>i</mi></mrow></math></span>) the increase of the flow-field open area fraction, (<span><math><mrow><mi>i</mi><mi>i</mi><mi>i</mi></mrow></math></span>) the design of highly anisotropic PTLs with a relatively large pore radius between <span><math><mrow><msub><mrow><mi>r</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>∼</mo><mn>10</mn><mo>−</mo><mn>40</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>, and (<span><math><mrow><mi>i</mi><mi>v</mi></mrow></math></span>) increasing the homogeneity of the PTL microstructure.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126889"},"PeriodicalIF":5.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628020","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":"Conjugate heat transfer analysis of a ram/scramjet with thermal decomposition of the regenerative cooling channel","authors":"Jae Seung Kim ,&nbsp;Song Hyun Seo ,&nbsp;Chang Gyoo Ban ,&nbsp;Kyu Hong Kim","doi":"10.1016/j.ijheatmasstransfer.2025.126901","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126901","url":null,"abstract":"<div><div>This study conducts a conjugate heat transfer (CHT) analysis to design the regenerative cooling system of a dual-mode ram/scramjet aircraft operating in a flight environment. The analysis incorporates key factors such as heat generation from airflow, temperature variations due to structural material, and the properties of supercritical fuel within the cooling channels. The cooling channel analysis part introduces a temperature correction method for efficient supercritical flow simulation. The CHT methodology was validated through comparisons with experimental data, focusing on aerodynamic heating, structural thermal responses, and cooling channel performance. The analysis also includes the prediction of supercritical fuel properties, specifically the thermal decomposition of JP-10 fuel, which is characterized by a high critical compressibility factor (<span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>). By implementing a method that resolves instability in property predictions, a stable CHT analysis framework was established. This approach enables detailed investigation of thermal behaviors related to fuel flow within cooling channels. Furthermore, the application of a reliable predictive method for both the aircraft’s flight environment and the characteristics of fuels with high <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> extends the range of fuels that can be considered in CHT analyses. This study contributes to advancing the design and performance evaluation of regenerative cooling systems in high-speed aerospace applications.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126901"},"PeriodicalIF":5.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628018","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}