Journal of Engineering Thermophysics最新文献_第2页

Caloric and Transport Properties of the Intermetallic Compound 金属间化合物的热学和输运性质

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010182

A.Sh Agazhanov, A.R. Khairulin, R.N. Abdullaev, V.A. Nepomnyashchikh

引用次数: 0

Testing Vortex Identification Methods on a Synthetic Velocity Field 在合成速度场上测试涡识别方法

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010017

A.S. Surtaev, I.P. Malakhov, I.A. Pavlov, D.S. Panov, W. Chu, Q. Wang, A.N. Pavlenko

{"title":"Testing Vortex Identification Methods on a Synthetic Velocity Field","authors":"A.S. Surtaev, I.P. Malakhov, I.A. Pavlov, D.S. Panov, W. Chu, Q. Wang, A.N. Pavlenko","doi":"10.1134/S1810232826010017","DOIUrl":"10.1134/S1810232826010017","url":null,"abstract":"The present study is devoted to the experimental investigation of the boiling process of promising dielectric refrigerants HFE 7100 and Novec 649 on silicon substrate at atmospheric pressure. The purpose of the research is to determine the key heat transfer parameters, specifically nucleation temperature, heat transfer coefficients, critical heat fluxes, as well as the growth dynamics of irreversible dry spots, using the high-speed IR thermography method. It has been found that the boiling of Novec 649 is characterized not only by higher heat transfer coefficients and a lower nucleation temperature head, but also by lower critical heat fluxes (151 kW/m2) compared to HFE 7100 (183 kW/m2). The propagation velocity of irreversible dry spots during the boiling crisis development on a silicon substrate has been measured. For Novec 649, the velocity (6.8 mm/s) turned out to be lower than for HFE 7100 (10.4 mm/s). The obtained experimental data have been generalized and methods for calculating the basic thermal characteristics based on known theoretical models for silicon–dielectric fluid systems have been proposed. The research results are also of practical importance, providing engineers with specific data for designing highly efficient direct cooling systems for silicon wafers using dielectric fluids.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"35 1","pages":"1 - 11"},"PeriodicalIF":1.5,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148877965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 of the Influence of a Sweeping Jet on Turbulent Mixing in a Narrow Gap 窄间隙内扫流射流对湍流混合影响的实验研究

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010078

M.V. Shestakov, A.A. Yagodnitsyna

引用次数: 0

Influence of Solid Soluble Impurity Concentration on Heating and Evaporation Characteristics of Droplets of Solutions 固体可溶性杂质浓度对液滴加热和蒸发特性的影响

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010121

S.A. Kerimbekova, G.V. Kuznetsov, M.S. Shahray, R.M. Fedorenko

{"title":"Influence of Solid Soluble Impurity Concentration on Heating and Evaporation Characteristics of Droplets of Solutions","authors":"S.A. Kerimbekova, G.V. Kuznetsov, M.S. Shahray, R.M. Fedorenko","doi":"10.1134/S1810232826010121","DOIUrl":"10.1134/S1810232826010121","url":null,"abstract":"The article presents the results of an experimental study of the influence of the concentration of soluble solid impurities (NaCl, CuSO4, K2SO4, KH2PO4, and NaHCO3) on the processes of heating and evaporation of droplets of aqueous solutions at gas medium temperatures of 335–683 K. It is shown that the presence of impurities in concentrations of 1 to 5% increases both the heating and evaporation rates compared to those of pure water, especially at high temperatures. The most intense evaporation is observed for NaHCO3 solutions, where internal vaporization and droplet fragmentation occur at late stages. The influence of the following most significant factors on heating and evaporation characteristics of suspension droplets has been determined: impurity type and concentration, gas flow temperature, and initial droplet sizes. Experimental dependences of heating and evaporation rates of suspension droplets have been established for varying parameters of the gas medium surrounding droplets. Recommendations have been formulated for application of the experimental results to development of technologies of heat and fire purification of waste and industrial waters from solid soluble impurities.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"35 1","pages":"123 - 138"},"PeriodicalIF":1.5,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148877999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Testing Vortex Identification Methods on a Synthetic Velocity Field 在合成速度场上测试涡识别方法

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010042

B.B. Ilyushin

引用次数: 0

Magnetohydrodynamic Mixed Convection of Hybrid Nanofluid Flow past Non-Isothermal Cone/Wedge Surfaces with Non-Linear Radiation and Chemical Reaction 混合纳米流体通过非等温锥/楔表面的磁流体动力学混合对流与非线性辐射和化学反应

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010108

M.S. Hussain, S.M. Ibrahim, B.N. Lakshmi, C. Maheswari, G. Lorenzini

{"title":"Magnetohydrodynamic Mixed Convection of Hybrid Nanofluid Flow past Non-Isothermal Cone/Wedge Surfaces with Non-Linear Radiation and Chemical Reaction","authors":"M.S. Hussain, S.M. Ibrahim, B.N. Lakshmi, C. Maheswari, G. Lorenzini","doi":"10.1134/S1810232826010108","DOIUrl":"10.1134/S1810232826010108","url":null,"abstract":"The current article focuses on the examination of a hybrid nanofluid magnetohydrodynamic flow across two different geometries, specifically a cone or wedge, within a porous medium with considering non-linear thermal radiation and chemical reactions. Hybrid nanoliquids have numerous applications in engineering and industry. Cone and wedge geometries are commonly employed in processing of polymer data. Hybrid nanoliquids exhibit superior performance in heat and mass transport rates when compared to both nanoliquids and conventional liquids. This study introduces the concept of hybrid nanoliquid to enhance energy and mass transfer, demonstrating favorable outcomes in thermal and mass transfer performance. The current study is structured using partial differential equations, which are converted into ordinary differential equations through appropriate similarity transformations. Numerical solutions are derived utilizing the bvp4c function within the MATLAB environment. This simplification has several significant outcomes: increasing the non-linear thermal radiation parameter enhances the thermal profile of the hybrid nanoliquid; the mass transfer rate of the hybrid nanoliquid decreases with respect to the Schmidt number and the chemical reaction; hybrid nanofluids excel single component nanofluids in their thermal performance, which confirms their potential in enhancing the heat transfer efficiency.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"35 1","pages":"91 - 112"},"PeriodicalIF":1.5,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Development of Probe Ultrasonic Method for Diagnostics of Flow Velocity through Multiphase Barrier 探头超声诊断多相障壁流速的研究进展

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010054

I.K. Kabardin, V.G. Meledin, S.V. Dvoinishnikov, V.V. Rakhmanov, V.O. Zuev, M.R. Gordienko, S.V. Kakaulin, A.M. Oborin, A.T. Yanchat, G.V. Bakakin

引用次数: 0

Exergy Analysis of Transient Operation Modes of Liquid Cooling Systems of Microprocessors 微处理器液冷系统瞬态运行模式的火用分析

IF 1.5 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-09-04 DOI: 10.1134/S1810232826010157

A.I. Andreev, A.E. Semenov, R.A. Ilyin

{"title":"Exergy Analysis of Transient Operation Modes of Liquid Cooling Systems of Microprocessors","authors":"A.I. Andreev, A.E. Semenov, R.A. Ilyin","doi":"10.1134/S1810232826010157","DOIUrl":"10.1134/S1810232826010157","url":null,"abstract":"The paper analyzes liquid cooling systems of high-performance microprocessors (Intel Core i7-13700K, i9-14900K), integrated with compression refrigeration machines, in transient and steady-state operating modes. Data on heat transfer coefficients for two microchannel heat transfer surfaces with plate and prismatic fins have been obtained experimentally. The conducted analysis has shown that the plate heat exchanger has a higher heat transfer coefficient, but its exergy losses are 15–40% higher due to hydraulic resistance. A transient analysis has revealed system delays (150–250 s) for both processors, resulting in an increase in exergy losses up to 12% of the compressor power. It is shown that with an increase in the heat load above 300 W the total exergy losses are non-linear ((propto Q^{1.8})). At a load of 300 W, losses deviate from linear growth by 18–25%; the proportion of hydraulic losses in the cooling agent circuit increases to 40% and the flow unevenness results in an increase of (Delta T) in heat exchangers by 30–35%. The exergy efficiency of the system is reduced by 0.8–1.2% for every 50 W of load gain. An adaptive cooling agent flow rate control algorithm has been developed, providing optimum flow rate of 0.6 kg/min and a temperature difference of 13–14◦C reducing losses by 25%. The data obtained are consistent with those available in literary sources; they show the need to modernize the cooling system control algorithms as well as to update compressors (which accounts for 50% of the exergy loss). Another important issue of reducing total exergy losses is the reduction of a cooling system delay. Further research will focus on the investigation of the ways of reducing exergy losses in processor cooling systems.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"35 1","pages":"161 - 174"},"PeriodicalIF":1.5,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Peculiarities of Heat Transfer by Mixtures Briefly Superheated above the Liquid–Liquid Spinodal 液-液涡旋量以上短暂过热混合物的传热特性

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700249

D. Volosnikov, A. Melkikh, P. Skripov

{"title":"Peculiarities of Heat Transfer by Mixtures Briefly Superheated above the Liquid–Liquid Spinodal","authors":"D. Volosnikov, A. Melkikh, P. Skripov","doi":"10.1134/S1810232825700249","DOIUrl":"10.1134/S1810232825700249","url":null,"abstract":"The paper is devoted to elucidation of characteristic features of the heat transfer through a solid wall into a liquid heat-transfer agent in conditions of a confined space and a high heat flux density typical of modern mini-size systems. The objects of investigation were polypropylenglycol (PPG-425 and PPG-725) aqueous solutions with the lower critical solution temperature (LCST), transiently superheated with respect to the liquid—liquid equilibrium line and the liquid—liquid spinodal. Superheat was performed by the method of controlled pulse heat generation in a micro-size wire probe. The heating duration was from 20 to 100 ms, and the probe temperature varied from 373 to 773 К at a supercritical pressure. The attention is focused on a search for the explanation of the considerable changes in heat-transfer intensity accompanying the decomposition of an unstable solution, as functions of the changes of the water content in the initial solution. A physical model of the spinodal decomposition of aqueous solution of PPG has been suggested. According to this model, the effect of the asymmetry of heat-transfer intensity with respect to the critical concentration of the solution is related to the concentration dependence of the solution viscosity. The results will serve as a basis for choosing the optimum composition for transferring high-density heat fluxes in solutions with the LCST.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"739 - 753"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 the Multilayer Thermophotovoltaic Thermal Emitter Based on the Simulated Annealing Algorithm 基于模拟退火算法的多层热光伏热发射器优化

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700316

Yifan Gu

{"title":"Optimization of the Multilayer Thermophotovoltaic Thermal Emitter Based on the Simulated Annealing Algorithm","authors":"Yifan Gu","doi":"10.1134/S1810232825700316","DOIUrl":"10.1134/S1810232825700316","url":null,"abstract":"It is crucial to optimize the thermophotovoltaic (TPV) thermal emitter to enhance energy conversion. In this work, the optimization of the thermal emitter is achieved through changing the layer thicknesses and the material arrangement of the thermal emitter. The transfer matrix method (TMM) and the simulated annealing algorithm (SAA) are integrated to achieve an optimal thermal emitter. By searching for the global optimal solution, the SAA can ultimately achieve an optimal multilayer thermal emitter structure with the value of figure of merit (FOM) = 85.34%, which is greatly surpassing most previous works. The optimal thermal emitter is comprised of three materials: Si, SiO2, and W. The material W (105 nm) is as the base, and the optimal TPV thermal emitter structure is: Si (15 nm), SiO2 (35 nm), Si (35 nm), W (15 nm), Si (15 nm), W (24 nm), Si (35 nm) from top to bottom. After optimizing the structure, this work conducted a detailed analysis of the physical mechanism and the theoretical efficiency of TPV system. More specifically, this work provides an insight into the mechanism through electric and magnetic fields of optimal thermal emitter at 570 and 1510 nm wavelengths. Related physical properties reveal that the incident spectral energy of this thermal emitter is almost below the bandgap wavelength of photovoltaic cell. Upon evaluating the system efficiency and theoretical emissivity of this TPV thermal emitter, it is found that the TPV thermal emitter exhibits superior system performance. This work paves the way for the design of a thermophotovoltaic thermal emitter.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"832 - 843"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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