Journal of Engineering Thermophysics最新文献_第6页

Experimental Investigations of Non-Stationary Heat and Mass Transfer with Reversible Air Flow through Fixed Layers of Absorbent and Heat-Accumulating Packing 通过固定层吸热和蓄热填料进行可逆气流非静态传热和传质的实验研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040124

I. V. Mezentsev, S. I. Mezentsev, Z. Wu, S. R. Gorelik, N. N. Mezentseva

引用次数: 0

Mixed Convection Flow of a Casson Fluid over a Curved Stretching Surface with Nonlinear Rosseland Thermal Radiation 卡松流体在具有非线性 Rosseland 热辐射的弯曲拉伸表面上的混合对流

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040148

M. Naveed, Z. Abbas, M. Sajid

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Visual Study of the Impact and Freezing Process of a Water Droplet on Carbon Fiber Plates 水滴对碳纤维板的冲击和冻结过程的视觉研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040112

J. J. Tian, H. Y. Wang, S. Mehendale, Z. Zhang, C. X. Wu, X. D. Gu

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Polymerization in Droplet of Aqueous Solution of PEGDA/Irgacure at Various Concentrations of Components 不同成分浓度下 PEGDA/Irgacure 水溶液液滴中的聚合情况

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040057

S. Y. Misyura, A. V. Bilsky, V. S. Morozov, M. N. Ryabov, O. A. Gobyzov

{"title":"Polymerization in Droplet of Aqueous Solution of PEGDA/Irgacure at Various Concentrations of Components","authors":"S. Y. Misyura, A. V. Bilsky, V. S. Morozov, M. N. Ryabov, O. A. Gobyzov","doi":"10.1134/S1810232823040057","DOIUrl":"10.1134/S1810232823040057","url":null,"abstract":"The authors experimentally studied the behavior of evaporation, convection in the liquid, and temperature of the free surface of a pendant droplet of aqueous solution of PEGDA/Irgacure 2959 before and after the onset of polymerization under UV radiation. Data on the temperature of the free surface of droplet were obtained for a wide range of the initial concentration of the polymer base (C_{0}). For (C_{0}= 35)% and less, no polymerization area was observed (according to thermal images). The temperature gradients observed over the droplet surface were very low (less than 0.3°C). At (C_{0}= 65)% and (C_{0}= 90)%, the average temperature (T_{rm S}) on the free surface of droplet changed during polymerization by 2.8C° and 3.7°C, respectively. After polymerization, (T_{rm S}) for the hydrogel became higher than (T_{rm S }) of droplet of pure water. The average velocity of motion of polyamide particles (U_{C}) for water was 2.2–2.4 times higher than that for the PEGDA solution with the initial concentration (C_{0} = 65)%, which is associated with the higher viscosity of the solution. At the onset of polymerization, the velocity (U_{C})dropped to 0 mm/s in a very short time. With increase in the concentration (C_{0}) in the pre-polymer, the time of polymerization reaction start decreased significantly, which shortened the time in which the particles stopped completely. Different limiting factors govern evaporation of a water droplet and a hydrogel droplet. The evaporation rate of droplet of hydrogel decreased with time due to the porous structure of the hydrogel.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"702 - 713"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138629705","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}

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A Novel Method Based on a Non-Stationary Discrete Markov Chain for Tracking Variations in the Quantity of Reserved Energy and the Number of Electric Vehicles 一种基于非静态离散马尔可夫链的新方法，用于跟踪储备能源数量和电动汽车数量的变化

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040094

M. H. Bahmani, M. Esmaeili Shayan, G. Lorenzini

{"title":"A Novel Method Based on a Non-Stationary Discrete Markov Chain for Tracking Variations in the Quantity of Reserved Energy and the Number of Electric Vehicles","authors":"M. H. Bahmani, M. Esmaeili Shayan, G. Lorenzini","doi":"10.1134/S1810232823040094","DOIUrl":"10.1134/S1810232823040094","url":null,"abstract":"Since the initial suggestion that electrically propelled vehicles could be used on the grid-side, numerous significant investigations have been conducted to showcase the capabilities of these technologies, which have proven to be highly advantageous. Nevertheless, there are still many uncertainties surrounding the integration of electric vehicles into the power grid, which is why it has been likened to a black box. These uncertainties include the number of electric vehicles that will be connected to the grid at any given time, the amount of energy that will be stored in their batteries during both the daytime and overnight, and the impact that their charging profiles will have on the overall load placed on the power system. In addition, there are several unanswered questions that need to be addressed. This article presents a novel model that effectively addresses these uncertainties. It is based on a non-stationary Markov chain, and it was introduced in this paper. The findings of the model provide fascinating insights into the number of electric vehicles connected to the grid and the amount of energy saved over the course of a day, as demonstrated by a case study. In addition, this article analyzes and evaluates the ability of the model to accurately represent the load modeling of electric vehicle charging.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"758 - 775"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138630476","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

Promising Cathode Materials for Solid Oxide Fuel Cells 前景看好的固体氧化物燃料电池阴极材料

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040070

M. R. Alsayed omar, A. G. Laptev, A. M. Dimiev, Ya. V. Ivanov

{"title":"Promising Cathode Materials for Solid Oxide Fuel Cells","authors":"M. R. Alsayed omar, A. G. Laptev, A. M. Dimiev, Ya. V. Ivanov","doi":"10.1134/S1810232823040070","DOIUrl":"10.1134/S1810232823040070","url":null,"abstract":"PURPOSE. The cathode in a solid oxide fuel cell is responsible for reduction of oxygen molecules to oxygen ions, which then migrate through the electrolyte to the anode. The thermophysical properties of the cathode material play a crucial role for the performance and efficiency of the fuel cell. So, creation of the cathodes of solid oxide fuel cells (SOFCs) requires taking into account the thermal and chemical stability, as well as analysis of the main characteristics of the cathodes, such as the electrocatalyst activity, electrical conductivity, and mechanical strength. This article presents a review of scientific literature on the qualitative characteristics of SOFC cathodes made of various alloys, as well as their operation parameters. In the review, results of functioning of such cathodes are compared in view of possible improvement of their performance parameters in dependence on the composition of the materials used. The composition and microstructure of cathode materials have a great influence on the characteristics of SOFCs. A rational composition of materials is ensured by controlled oxygen non-stoichiometry, and some aspects of defects can improve the ionic and electronic conductivity, as well as catalytic properties for the oxygen reduction in the cathode.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"728 - 735"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139015514","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

Base Fluids, Its Temperature and Heat Source on MHD Couette–Poiseuille Nanofluid Flow through Slippy Porous Microchannel with Convective-Radiative Condition: Entropy Analysis 基底流体、其温度和热源对对流-辐射条件下通过滑动多孔微通道的 MHD Couette-Poiseuille 纳米流体的影响：熵分析

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S181023282304015X

P. Mondal, D. K. Maiti

{"title":"Base Fluids, Its Temperature and Heat Source on MHD Couette–Poiseuille Nanofluid Flow through Slippy Porous Microchannel with Convective-Radiative Condition: Entropy Analysis","authors":"P. Mondal, D. K. Maiti","doi":"10.1134/S181023282304015X","DOIUrl":"10.1134/S181023282304015X","url":null,"abstract":"The intention behind this research work is to analyze the flow, heat transfer and entropy generation in a vertical channel filled with a nanofluid. The vertical microchannel is made of two parallel porous and slippy plates. The hot fluid is injected from the left side and succeeded from the right side. Fluid flow within the channel is induced due to an applied favorable/adverse pressure gradient (due to Couette–Poiseuille flow), right plate movement, buoyancy force due to the temperature difference of the channel plates in the presence of heat generation/absorption inside the channel and subjected to a constant applied transverse magnetic field. The resulting governing equations are solved numerically by the shooting method. The conventional fluids are chosen as water, and ethylene glycol-water mixture. The nanoparticles are selected as Al2O3 and CuO. Nanofluids modeling, which takes care of base fluid temperature, Brownian motion, diameter and concentration of nano particles, and base fluid physical properties are considered here. Roles of pressure gradient P (at the inlet), temperature of base fluids, heat generation/absorption, the density of the nanoparticle volume fraction on flow and heat transfer characteristics (velocity and temperature distribution, Nusselt number (Nu) distribution, entropy generation and Bejan Number) are investigated here. How the sequence of appearance of curves of flow and heat transfer characteristics (due to variation of aforesaid parameters) are disturbed by the presence of injection/suction, radiation and convective boundary condition is discussed here. A critical analysis is conducted on the individual contribution of irreversibilities due to heat flow, fluid friction and Joule heating to the total entropy generation. At last, we try to find an optimum condition at which local and global entropy generation are minimally generated in the channel.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"835 - 857"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627943","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}

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Heat Capacity of Corrosion-Resistant Refractory Alloy ChS88U-VI in the Temperature Range of 300–1270 K 耐腐蚀耐火合金 ChS88U-VI 在 300-1270 K 温度范围内的热容量

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040033

D. A. Samoshkin, S. V. Stankus, A. Sh. Agazhanov

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On Temperature of Working Fluid Supply to Combustion Chamber in CO2 Power Cycles with Oxy-Combustion of Methane 二氧化碳甲烷氧燃烧发电循环中燃烧室工作流体的温度问题

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040136

I. S. Sadkin, E. M. Korepanova, P. A. Shchinnikov

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Linear Thermal Expansion Coefficient of Nickel NP2 Brand 镍 NP2 品牌的线性热膨胀系数