International Journal of Heat and Mass Transfer最新文献_第2页

Graphene-tuned nonreciprocal thermal emitter under near-normal illumination

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-14 DOI: 10.1016/j.ijheatmasstransfer.2025.126966

Xuantong Shi , Bo Wang , Jing Ye , Jinyun Zhou

引用次数: 0

Momentum and energy budgets of high-pressure subcooled boiling flows using two-fluid RANS simulations

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-14 DOI: 10.1016/j.ijheatmasstransfer.2025.126839

Etienne Chavasse-Frétaz , Alan Burlot , Guillaume Bois , Catherine Colin

{"title":"Momentum and energy budgets of high-pressure subcooled boiling flows using two-fluid RANS simulations","authors":"Etienne Chavasse-Frétaz , Alan Burlot , Guillaume Bois , Catherine Colin","doi":"10.1016/j.ijheatmasstransfer.2025.126839","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126839","url":null,"abstract":"<div><div>This study presents the simulation of a high-pressure upward boiling flow in a vertical pipe, using the two-fluid model with Neptune_CFD standard closure laws. Radially-dependent experimental bubble diameters are enforced in the simulations, reducing the number of closure laws and helping to decouple some phenomena in the analysis. The goal of this paper is to highlight the predominant physical phenomena as a function of flow conditions and as a function of the distance to the wall, in order to help determine which model should be improved as a priority. Analysis of the momentum balance for the vapor phase shows that in the radial direction, the predominant effects are turbulent dispersion moving the vapor away from the wall, balanced by the drag and lift forces. An increase in mass flow rate or thermodynamic quality increases liquid shear rate, turbulent viscosity and turbulent dispersion. In addition, liquid enthalpy budget analysis reveals that the liquid temperature is determined by an equilibrium between the radial turbulent diffusion of wall heat, axial inertial thermal effects and an interphase exchange by condensation. Simulations predict significant evaporation near the wall, although this phenomenon has not been observed experimentally, which is a source of error in the mass and enthalpy balances. We demonstrate the improvement in predictions in the near-wall region induced by the use of a limiter to the liquid heat flux in wall Heat Flux Partitioning (HFP) model. Condensation reaches its maximum in an intermediate radial position between the center and the wall, where interfacial area and subcooling are large. This position depends on the thermodynamic quality.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126839"},"PeriodicalIF":5.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal conductivity of suspended GaN thin film measured by Raman spectroscopy

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-14 DOI: 10.1016/j.ijheatmasstransfer.2025.126946

Sopheap Sam , Yutao Fang , Ziling Cai , Masatomo Sumiya , Liwen Sang

引用次数: 0

On the influence of radiation on the large-scale circulation in a Rayleigh–Bénard cubic cell

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-14 DOI: 10.1016/j.ijheatmasstransfer.2025.126899

Bérengère Podvin , Laurent Soucasse , Philippe Rivière , Anouar Soufiani

{"title":"On the influence of radiation on the large-scale circulation in a Rayleigh–Bénard cubic cell","authors":"Bérengère Podvin , Laurent Soucasse , Philippe Rivière , Anouar Soufiani","doi":"10.1016/j.ijheatmasstransfer.2025.126899","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126899","url":null,"abstract":"<div><div>Radiative transfer effects on the Large-Scale Circulation (LSC) in a Rayleigh–Bénard cubic cell are analyzed from coupled Direct Numerical Simulation data for an air/H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O/CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> mixture in the range <span><math><mrow><mi>R</mi><mi>a</mi><mo>∈</mo><mrow><mo>[</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>6</mn></mrow></msup><mo>,</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>8</mn></mrow></msup><mo>]</mo></mrow></mrow></math></span>. The local effects of radiation are first studied using conditional averaging. It is found that radiation coupling accentuates the temperature field asymmetry between the ejecting and the impinging sides. The mean kinetic energy increase is also higher on the ejecting side of the horizontal entrainment zone. To better understand the impact of these variations on the reorientation frequency of the LSC, a clustering analysis based on Latent Dirichlet Allocation (LDA) is carried out in the vertical mid-planes of the cell. The dynamics of the LSC can then be tracked through local characteristic patterns called motifs. We show that the contributions of the dominant heat flux motifs associated with plume ejection increase in the presence of radiation, while those of the dominant temperature motifs associated with impinging plumes tend to decrease, which is consistent with a reinforcement of the LSC with respect to the corner structures. Using a motif-based model, we show that the frequency decrease associated with this reinforcement is offset by the increase due to kinetic effects. The model predictions are found to be in good agreement with numerical data.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126899"},"PeriodicalIF":5.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621082","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 models of radiative transfer in fibrous insulation under collimated irradiation

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-13 DOI: 10.1016/j.ijheatmasstransfer.2025.126961

Sergio A. Carvajal , Lucas Paulien , Autumn Elniski , Kamran Daryabeigi , Matthew J. Berg

{"title":"Analytical models of radiative transfer in fibrous insulation under collimated irradiation","authors":"Sergio A. Carvajal , Lucas Paulien , Autumn Elniski , Kamran Daryabeigi , Matthew J. Berg","doi":"10.1016/j.ijheatmasstransfer.2025.126961","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126961","url":null,"abstract":"<div><div>Thermal insulation is essential for high temperature applications, where extreme operating conditions are found. Given its thermal, mechanical, optical and economical characteristics, refractory ceramic-based fibrous materials are widely used. In these materials, radiation is one of the most relevant mechanisms of heat transfer, making its modeling important for the design and optimization of thermal insulation systems. Although traditional techniques such as the Discrete Ordinate Method can be applied, the strong forward scattering found in fibrous materials limits the achievable accuracy due to the computing requirements and normalization issues associated with the phase function. Therefore, there is still a need for approximate but accurate methods to represent radiative transfer. This paper presents two analytical approaches based on the transport and delta-Eddington approximations, along with the Milne-Eddington method, for modeling the radiative transfer in low-density fibrous materials. Spectral transmittance and reflectance measurements on alumina and silica-based insulation were used for validation purposes. The model based on the transport approximation demonstrates good agreement with experimental measurements and can be used at wavelengths relevant to high-temperature applications. The model based on the delta-Eddington approximation extends the wavelength range of the transport approximation and can be used in applications at high and moderate temperatures. Since the models are based on deterministic properties, they can be used for engineering materials with tailorable properties and for improving their manufacturing process.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126961"},"PeriodicalIF":5.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal switching performance of surface plasmon polaritons in Ag2Se quantum-Dot/Polymer composite film

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-13 DOI: 10.1016/j.ijheatmasstransfer.2025.126943

Congliang Huang , Changkang Du , Yanru Yang , Xiaodong Wang

{"title":"Thermal switching performance of surface plasmon polaritons in Ag2Se quantum-Dot/Polymer composite film","authors":"Congliang Huang , Changkang Du , Yanru Yang , Xiaodong Wang","doi":"10.1016/j.ijheatmasstransfer.2025.126943","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126943","url":null,"abstract":"<div><div>To stabilize the working temperature of an equipment, a solid-state thermal switch is usually a requisite. In this work, the thermal switching performance of surface plasmon polaritons (SPPs) in Ag<sub>2</sub>Se quantum-dot (QD)/polymer film was probed. Firstly, a theoretical model of thermal conductivity of SPPs was derived to reveal the dependence of the thermal conductivity on both the temperature and film structure. Then, the thermal conductivity and the thermal switching performances of SPPs were analyzed. It shows that the thermal conductivity of SPPs is ∼<em>t</em><sup>-3</sup>exp(ζ/<em>Td</em>) under the thin film limit, here <em>t</em>, d and <em>T</em> are film thickness, diameter of QDs and temperature, respectively. A high thermal conductivity of SPPs could be only realized at a device with a size lager than millimeter scale, due to the need of avoiding boundary scatterings of SPPs. At the millimeter scale, the heat conduction of SPPs will be on the 100 nW·K<sup>-1</sup> level, on the same magnitude scale as the phonon and also phonon-polariton heat conductions. At this size scale, the thermal conductivity of SPPs could be reduced by 100 times by increasing temperature from 300 to 400 K, suggesting a thermal switching ratio of 100, which is one of the highest in these of all thermal switches. This study brings a new thermal switch which has a potential application in thermal management system.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126943"},"PeriodicalIF":5.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610029","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 study of the micro-mechanism of CO2 hydrate formation in the confined space of porous media

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-13 DOI: 10.1016/j.ijheatmasstransfer.2025.126940

Xuemin Zhang , Tao Shan , Hongbin Song , Jinping Li , Qingbai Wu

{"title":"Molecular dynamics study of the micro-mechanism of CO2 hydrate formation in the confined space of porous media","authors":"Xuemin Zhang , Tao Shan , Hongbin Song , Jinping Li , Qingbai Wu","doi":"10.1016/j.ijheatmasstransfer.2025.126940","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126940","url":null,"abstract":"<div><div>Sequestration and storage of CO<sub>2</sub> in the form of hydrate is an effective strategy to reduce carbon dioxide emissions in the atmosphere. In this work, Molecular Dynamics simulation was employed to investigate the formation process of CO<sub>2</sub> hydrate in the confined space of graphene porous media by comparing to the pure water system with fully developed space. Results demonstrated that hydrate formation was facilitated in confined space of porous media. The incorporation of porous media and the existence of confined space prominently enhanced the heat and mass transfer characteristics, with the thermal conductivity along the formation direction reaching 2614.22 % of the pure water system. However, such porous media and structure simultaneously induced hydrate structural destabilization, including decomposition, band diffusion, and dislocation of hydrate cell. Notably, the existence of unstable hydrate cages promoted the rapid formation of hydrate. And this study also thoroughly elaborated distinct regulatory mechanisms between unstable non-empty and empty cages. Additionally, due to the superior adsorption effect of graphene on CO<sub>2</sub> molecules, the CO<sub>2</sub> molecular \"bubble\" reduced the impact from porous media on hydrate.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126940"},"PeriodicalIF":5.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610032","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

Experimental study on the heat transfer performance of the two-phase spray cooling of Liquefied natural gas

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-13 DOI: 10.1016/j.ijheatmasstransfer.2025.126954

Xiaochuan LIU , Guiping LIN , Jinghui GUO

{"title":"Experimental study on the heat transfer performance of the two-phase spray cooling of Liquefied natural gas","authors":"Xiaochuan LIU , Guiping LIN , Jinghui GUO","doi":"10.1016/j.ijheatmasstransfer.2025.126954","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126954","url":null,"abstract":"<div><div>To improve the heat dissipation capability of future aircraft, the design of thermal management systems using cryogenic fuels has become one of the trending research directions in recent years. This study explores the feasibility of using liquefied natural gas (LNG) for spray cooling applications. An LNG spray cooling experimental system is constructed. The influence of spray flow rate, spray height, and surface roughness on spray heat transfer characteristics are discussed. Results show that LNG's critical heat flux (CHF) increases with flow rate (61.6 % higher at 0.3 kg/min than at 0.12 kg/min) and decreases with spray height (43.4 % higher at 11.5 mm compared to 31.5 mm). Surface roughness also enhances heat transfer, with a 12.4 % higher CHF observed on rough surface. The maximum CHF of 341 W/cm<sup>2</sup> of all experimental results is obtained with the surface sanded by P120 sandpaper at the spray height of 21.5 mm and the spray flow rate of 0.25 kg/min. Dimensionless correlation for LNG spray cooling is proposed as a function of Reynolds, Prandtl, Weber, and Jacob numbers. The experiments of water spray cooling using the same nozzle are also investigated to compare the differences in heat transfer capacity and application prospects of water and LNG.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126954"},"PeriodicalIF":5.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610030","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

Dynamic behaviors and heat transfer of HFE-7100 droplet impingement on heated copper surfaces

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-13 DOI: 10.1016/j.ijheatmasstransfer.2025.126965

Bo Xu , Jiahao Yang , Zhenqian Chen , Xin Wang

{"title":"Dynamic behaviors and heat transfer of HFE-7100 droplet impingement on heated copper surfaces","authors":"Bo Xu , Jiahao Yang , Zhenqian Chen , Xin Wang","doi":"10.1016/j.ijheatmasstransfer.2025.126965","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126965","url":null,"abstract":"<div><div>Droplet impingement is of great significance in fields such as electronic heat dissipation and spacecraft thermal management, such as flash evaporator and high-power lasers. In this work, a systematic experiment is conducted on the HFE-7100 droplet impingement on a heated copper surface to investigate the effects of surface temperature (<em>T<sub>s</sub></em>) and Weber number (<em>We</em>) on the dynamic behaviors and heat transfer characteristics. The results demonstrate that the droplet impact behaviors can be classified into six regimes: deposition, deposition and splitting, partial bouncing, complete bouncing, fragmentation, and splashing. When <em>We</em>≤85.4, the maximum spreading factor (<em>D<sub>max</sub></em>/<em>D</em><sub>0</sub>) first decreases linearly with <em>T<sub>s</sub></em> and then remains constant when <em>T<sub>s</sub></em>>100 °C, while at <em>We</em>≥136.7, <em>D<sub>max</sub></em>/<em>D</em><sub>0</sub> varies with <em>T<sub>s</sub></em> in four stages due to the existence of liquid fingers and vapor layer, being independent of <em>T<sub>s</sub></em> at <em>T<sub>s</sub></em>≤50 °C and <em>T<sub>s</sub></em>>100 °C, decreasing with <em>T<sub>s</sub></em> at 50 °C<<em>T<sub>s</sub></em>≤70 °C, and increasing with <em>T<sub>s</sub></em> at 70 °C<<em>T<sub>s</sub></em>≤100 °C. The average diameter of bubbles inside the liquid film strongly depends on <em>T<sub>s</sub></em>, while the average diameter of satellite droplets is significantly affected by <em>We</em>. The Leidenfrost temperature of drop is in the range of 100∼110 °C. At <em>We</em>=273.4 and <em>T<sub>s</sub></em>=75 °C, the heat flux is the highest at 958.6 kW/m², corresponding to the shortest droplet lifetime.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126965"},"PeriodicalIF":5.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610031","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

Experimental and molecular dynamics study on the reaction characteristics of methane-ammonia mixed fuel on SOFC anodes

IF 5 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-03-12 DOI: 10.1016/j.ijheatmasstransfer.2025.126947

Yuting Guo, Taiyo Taniuchi, Sora Nozaki, Masashi Kishimoto, Hiroshi Iwai

{"title":"Experimental and molecular dynamics study on the reaction characteristics of methane-ammonia mixed fuel on SOFC anodes","authors":"Yuting Guo, Taiyo Taniuchi, Sora Nozaki, Masashi Kishimoto, Hiroshi Iwai","doi":"10.1016/j.ijheatmasstransfer.2025.126947","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126947","url":null,"abstract":"<div><div>This study employs experiment and molecular dynamics (MD) simulations to investigate the reaction characteristics of methane-ammonia mixed fuels on a Ni-yttria-stabilized zirconia (YSZ) anode of solid oxide fuel cells (SOFCs). Experimental results found that when a methane-ammonia mixed fuel is supplied, the ammonia decomposition reaction occurs preferentially, and the steam reforming of methane is inhibited. However, at a higher temperature, the decomposition rate of ammonia decreases with a lower mole fraction of ammonia, and the decline in the methane reforming rate becomes gentler. MD simulations reveal that water adsorbs onto YSZ through electrostatic interactions, forming stable multilayer adsorption. In contrast, ammonia adsorbs onto YSZ through interfacial bonding, resulting in monolayer adsorption that is more susceptible to temperature. At higher temperatures, lower ammonia mole fraction and higher water mole fraction significantly reduce the adsorption of ammonia on YSZ. This reduction limits the supply of ammonia from YSZ to the Ni surface, consequently decreasing the ammonia decomposition rate and hence lessening the inhibitory effect of ammonia on steam methane reforming. It is also found that, ammonia molecules exhibit greater surface diffusion than water, enabling more effective mobility from YSZ to the Ni surface where they occupy reaction sites, resulting in the inhibition of the steam methane reforming reaction. In addition, the extensive adsorption of water molecules can significantly enhance interfacial heat transfer, which may enhance the endothermic methane steam reforming reaction.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"244 ","pages":"Article 126947"},"PeriodicalIF":5.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601076","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