Journal of Engineering Thermophysics最新文献

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

Numerical Simulation of Droplet-Laden Flow in a Cylindrical Duct in the Absence of Cross-Flow 无横流条件下圆柱形管道内载液滴流动的数值模拟

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700213

M. A. Pakhomov

引用次数: 0

Study of Diffusion Combustion of a Hydrogen Microjet in the Presence of a Coaxially Supplied Air Flow 同轴送风条件下氢气微射流扩散燃烧的研究

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700201

A. S. Tambovtsev, V. V. Kozlov, Yu. A. Litvinenko, A. G. Shmakov

引用次数: 0

Modeling and Analysis of Magneto-Hydrodynamic Sisko Nanofluid Flow over a Nonlinearly Stretchable Porous Sheet with Thermal Radiation 热辐射下非线性可拉伸多孔板上磁流体动力学Sisko纳米流体流动建模与分析

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700298

Prathi Vijaya Kumar, Kanithi Jyothsna, Shaik Mohammed Ibrahim, Syamala Ramadevu, Giulio Lorenzini

{"title":"Modeling and Analysis of Magneto-Hydrodynamic Sisko Nanofluid Flow over a Nonlinearly Stretchable Porous Sheet with Thermal Radiation","authors":"Prathi Vijaya Kumar, Kanithi Jyothsna, Shaik Mohammed Ibrahim, Syamala Ramadevu, Giulio Lorenzini","doi":"10.1134/S1810232825700298","DOIUrl":"10.1134/S1810232825700298","url":null,"abstract":"This work examines the action of a magneto-Sisko fluid within a two-dimensional setting when it is subjected to a nonlinearly extensible sheet with a porous medium. The assessment considers the impacts of a continuous magnetic field, thermal radiation, and heat creation while also considering the implications of Brownian motion and thermophoresis diffusion. By employing appropriate similarity transformations, the sets of partial differential equations governing the system are transformed into a set of ordinary differential equations. These are then solved utilizing the NDSolve technique in MATHEMATICA. This research offers a tangible explanation for simulating and analyzing distinct flow properties, like concentration, temperature, and velocity profiles, in return for numerous influencing factors. These data reveal that raising the Sisko fluid parameter enhances the velocity profiles while reducing both the temperature and concentration curves. In addition, greater values of the power-law exponent and the nonlinear stretching coefficient result in reduced velocity, temperature, and concentration profiles. The results agree with the conclusions of previous investigations.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"793 - 810"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579488","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

Radial Uniformity in Trickle Beds: CFD Insights into Gas-Liquid Distributor Design at Industrial Scale 滴流床径向均匀性：工业规模气液分布器设计的CFD洞察

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700304

Peng Yan, Zeqi Chen, Bowen Zhao, Xueli Geng, Xin Gao, Liyan Liu, Haibo Jin

{"title":"Radial Uniformity in Trickle Beds: CFD Insights into Gas-Liquid Distributor Design at Industrial Scale","authors":"Peng Yan, Zeqi Chen, Bowen Zhao, Xueli Geng, Xin Gao, Liyan Liu, Haibo Jin","doi":"10.1134/S1810232825700304","DOIUrl":"10.1134/S1810232825700304","url":null,"abstract":"The radial uneven distribution of the liquid phase in trickle beds significantly impacts mass transfer, heat transfer, and reaction efficiency. This study addresses the gap in optimizing gas-liquid distributors for enhanced radial uniformity, particularly in high gas-liquid ratio, low spray density, multiphase exothermic reaction systems. Using CFD simulations, a quasi-homogeneous model was combined with bulk chemical reaction and porous media models to simulate the catalytic process in industrial trickle beds. The effects of various chimney structures in liquid and gas-liquid distributors on radial velocity, composition, and temperature distribution were analyzed. Key findings reveal that coil-type distributors outperform grid-type and perforated designs in terms of overflow liquid layer performance. Additionally, the four-leaf quincunx chimney structure provides superior radial uniformity compared to the eight-leaf and windmill-type outlets. The study’s results contribute to the safer operation and optimized design of trickle bed reactors for highly exothermic reactions.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"811 - 831"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579494","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

Capillary Wicking and Heat Transfer during Boiling of HFE-7100 on Black Silicon Surfaces with Different Morphologies 不同形态黑硅表面HFE-7100沸腾过程中的毛细抽吸和传热

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700225

O. Volodin, E. Vyacheslavova, A. Baranov, I. Malakhov, S. Konev, I. Kosovskikh, V. Serdyukov

{"title":"Capillary Wicking and Heat Transfer during Boiling of HFE-7100 on Black Silicon Surfaces with Different Morphologies","authors":"O. Volodin, E. Vyacheslavova, A. Baranov, I. Malakhov, S. Konev, I. Kosovskikh, V. Serdyukov","doi":"10.1134/S1810232825700225","DOIUrl":"10.1134/S1810232825700225","url":null,"abstract":"The paper presents the results of an experimental study on the effect of the morphology of a hemi-wicking black silicon surface on capillary wicking and heat transfer characteristics during pool boiling of HFE-7100. The investigated homogeneous and hybrid silicon surfaces were fabricated using low-temperature plasma-chemical etching. It was shown that the modified silicon surfaces enhance liquid wicking, with taller homogeneous needle-like microstructures promoting more efficient liquid spreading. Hybrid surfaces (combining low and high needle-like microstructures) exhibit significantly higher values of the Wi number (characterizing capillary wicking) compared to homogeneous ones. Heat transfer experiments were carried out on the most efficient (in terms of capillary wicking) homogeneous and hybrid black silicon surfaces. Unlike in the case of water boiling, the expected increase in critical heat flux (CHF) was not achieved for HFE-7100 on black silicon surfaces due to the partial or complete loss of hydrophilicity during boiling. Instead, the experiments revealed a noticeable enhancement of the heat transfer coefficient (HTC) on both homogeneous and hybrid surfaces, which can be attributed exclusively to the effect of microstructuring rather than capillary wicking.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"709 - 720"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579201","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

The Effect of Phase-Change Material on the Efficiency of Decentralized Ventilation Systems 相变材料对分散通风系统效率的影响

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700286

I. V. Mezentsev, D. B. Chapayev, S. A. Tihomirov, D. G. Titkov

引用次数: 0

The Influences of Various Fin and Corrugation Arrangements on Flow Characteristics and Transfer of Heat in Ducts of Semi-Circular Grooved Using Diamond–Water Nanofluid 不同翅片和波纹布置对金刚石-水纳米流体半圆沟槽管内流动特性和传热的影响

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700341

Koray Karabulut, Yeliz Alnak

{"title":"The Influences of Various Fin and Corrugation Arrangements on Flow Characteristics and Transfer of Heat in Ducts of Semi-Circular Grooved Using Diamond–Water Nanofluid","authors":"Koray Karabulut, Yeliz Alnak","doi":"10.1134/S1810232825700341","DOIUrl":"10.1134/S1810232825700341","url":null,"abstract":"In this work, the transfer of heat and characteristic of flow in semi-circular grooved finless, double and triple semi-circular grooved finned channels were researched numerically by comparing them with the straight channel. Using the Ansys-Fluent computer program, numerical analysis was performed by solving the conservation equations under steady, two-dimensional and laminar flow conditions. To better direct the flow to the lower surfaces of corrugated channels with constant surface temperature, the fins were positioned between the grooves at the top surface of the duct at angles of 30°, 60°, and 90° (θ) with the horizontal and at different heights of 3, 6, and 9 mm (z). The outcomes of the work were searched as variations in the mean Nu number (Num corrugated ch/Num straight ch., mean surface temperature (Tsm corrugated ch/Tsm straight ch) and performance evaluation criteria (PEC), taking into account the effects of fin angles and heights for all the semi-circular grooved channels employing water and diamond–water nanofluid. The study’s outcomes were checked against both the numerical outcomes and, the analytical equation of the work in the literature giving the mean Nu number (Num) under the condition of flow of laminar. The outcomes illustrated that increasing the fin height (z) from 3 to 9 mm for Re = 600 in the double semi-circular grooved duct with a 60° fin angle provides the (Num corrugated ch/Num straight ch rate increase by 11.99%. Moreover, for Re = 1000, the PEC value of the triple semi-circular corrugated channel with θ = 90° and z = 9 mm fins and nanofluid is 5.15% higher than that of the double corrugated finned channel.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 4","pages":"857 - 881"},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579205","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

Control of Flow Structure of Supersonic Underexpanded Jet of Rarified Gas 超声速稀薄气体欠膨胀射流流动结构控制

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2026-04-01 DOI: 10.1134/S1810232825700195

V. N. Yarygin, V. G. Prikhodko, I. V. Yarygin

引用次数: 0