Journal of Engineering Thermophysics最新文献_第10页

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}

引用次数: 0

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

引用次数: 0

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

引用次数: 0

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

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040045

Yu. M. Kozlovskii, S. V. Stankus

引用次数: 0

Structure of Liquid Jets and Wetting Front in the Refrigerant Mixture Falling Films at Various Contact Angles 不同接触角下制冷剂混合物落膜中的液体射流和润湿前沿的结构

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040021

A. Yu. Sakhnov, A. N. Pavlenko, N. I. Pecherkin, O. A. Volodin

{"title":"Structure of Liquid Jets and Wetting Front in the Refrigerant Mixture Falling Films at Various Contact Angles","authors":"A. Yu. Sakhnov, A. N. Pavlenko, N. I. Pecherkin, O. A. Volodin","doi":"10.1134/S1810232823040021","DOIUrl":"10.1134/S1810232823040021","url":null,"abstract":"The paper presents 3D numerical modeling of spreading dynamics of R21 (mol. fraction: 0.9) and R114 refrigerant mixture film. We considered an outer flow along a round vertical cylinder at Reynolds number 104 and contact angles of 10°, 30°, 50°, 70°, and 90°. The simulation was performed in OpenFOAM software on the basis of the volume of fluid (VOF) method. Simulated results show an occurrence of the liquid jets flowing from the upper continuous falling film in the range of contact angles 30°–90°, while the liquid flow at contact angle of 10° keeps the only continuous film till the bottom boundary of the cylinder. We defined two scenarios for wetting of the cylinder sidewall at different contact angles: liquid near the contact line moves down and towards to the cylinder surface at (theta = 10^circ), 30°, and 50°, while only vertical velocity differs from zero at (theta = 70^circ) and 90°, excluding jets at (theta = 70^circ). The increase of the contact angle leads to complication of the structure of the refrigerant mixture falling films, arising of jets and redistribution of flow rate between them.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"672 - 691"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138630641","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 and Analysis of Turbulent Natural Convection at Isothermal Vertical Plate 等温垂直板湍流自然对流的实验研究与分析

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040082

A. G. Kirdyashkin, A. A. Kirdyashkin

引用次数: 0

Evaporation and Boiling Heat Transfer at Film Irrigation of Horizontal Roughened Tubes 水平粗化管薄膜灌溉时的蒸发和沸腾传热

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S181023282304001X

A. N. Pavlenko, A. I. Kataev, I. B. Mironova

引用次数: 0

Saturated Pool Boiling Heat Transfer of R-141b on Al2O3 Nano-Structured Surfaces Fabricated by Dip-Coating Method 浸涂法制造的 Al2O3 纳米结构表面上 R-141b 的饱和池沸腾传热

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI: 10.1134/S1810232823040100

A. S. Katarkar, A. D. Pingale, S. Satpathy, V. Goyal, B. Majumder, A. Saha, S. Bhaumik

{"title":"Saturated Pool Boiling Heat Transfer of R-141b on Al2O3 Nano-Structured Surfaces Fabricated by Dip-Coating Method","authors":"A. S. Katarkar, A. D. Pingale, S. Satpathy, V. Goyal, B. Majumder, A. Saha, S. Bhaumik","doi":"10.1134/S1810232823040100","DOIUrl":"10.1134/S1810232823040100","url":null,"abstract":"In pool boiling applications, appropriate surface properties of the heating surface are crucial for improving the heat transfer. In this study, two different Al2O3 nano-structured surfaces were fabricated using dip-coating method by controlling coating thickness, and adopted to conduct pool boiling experiments with R-141b. Prepared Al2O3 nano-structured surfaces were characterized by scanning electron microscopy (SEM), elemental dispersive spectroscopy (EDS), ellipsometer, contact angle meter, and 2D profilometer to investigate the surface morphology, elemental composition, thickness, angle of contact, and surface roughness, respectively. Based on the surface characterization and boiling curves, the effects of coating thickness (300 nm and 400 nm) on the pool boiling heat transfer were examined. The heat transfer coefficient (HTC) of Al2O3 nano-structured surface (S2) was the highest, followed by those of Al2O3nano-structured surface (S1), and plain copper surface. The outstanding heat transfer performance of Al2O3 nano-structured surfaces is mainly associated with enhanced surface wettability and increased active nucleation site density.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"776 - 787"},"PeriodicalIF":1.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138629689","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