Journal of Non-Equilibrium Thermodynamics最新文献_第9页

Maximum work configuration of finite potential source endoreversible non-isothermal chemical engines 有限势源内可逆非等温化学发动机的最大功构型

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-11-18 DOI: 10.1515/jnet-2022-0045

Lingen Chen, Shaojun Xia

{"title":"Maximum work configuration of finite potential source endoreversible non-isothermal chemical engines","authors":"Lingen Chen, Shaojun Xia","doi":"10.1515/jnet-2022-0045","DOIUrl":"https://doi.org/10.1515/jnet-2022-0045","url":null,"abstract":"Abstract Chemical engine is an abstract model of some devices, such as solid state, photochemical, and electrochemical devices, photovoltaic cell, and mass exchangers. Finite chemical-potential source is one of its features. Finite time thermodynamics provides effective theoretical tool for determining performance limits for given thermal systems, and determining optimal process paths of thermal systems for given performance objectives. Endoreversible model is its basic model. A model of endoreversible non-isothermal chemical engines operating between a finite chemical-potential source and an infinite chemical-potential sink with mass resistance and heat resistance is established. Mass transfer processes between chemical potential reservoir and working fluid of the model are assumed to obey Onsager equations in linear irreversible thermodynamics. With a fixed cycle period, optimal cycle configuration for the maximum work output of the model is derived by applying optimal control theory. The results obtained include optimal performance and optimal path results in many previous literatures, and can provide some theoretical guidelines for optimal designs of practical chemical plants.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49584299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 15

Stability Analysis of Double Diffusive Convection in Local Thermal Non-equilibrium Porous Medium with Internal Heat Source and Reaction Effects 具有内热源和反应效应的局部热非平衡多孔介质双扩散对流稳定性分析

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-20 DOI: 10.1515/jnet-2022-0047

N. Noon, S. Haddad

引用次数: 3

Heat Engine Cycle Configurations for Maximum Work Output with Generalized Models of Reservoir Thermal Capacity and Heat Resistance 基于广义储热容和热阻模型的最大功输出热机循环配置

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-16 DOI: 10.1515/jnet-2022-0029

Lingen Chen, Shaojun Xia

引用次数: 27

Thermoelectric Response Characteristics of Bi2Te3 Based Semiconductor Materials Bi2Te3基半导体材料的热电响应特性

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-16 DOI: 10.1515/jnet-2022-0049

Zhanxuan Wang, Xiulian Cheng, K. Guo, Enling Tang, Lei Li, Hui Peng, Yafei Han, Chuang Chen, Mengzhou Chang, Liping He

{"title":"Thermoelectric Response Characteristics of Bi2Te3 Based Semiconductor Materials","authors":"Zhanxuan Wang, Xiulian Cheng, K. Guo, Enling Tang, Lei Li, Hui Peng, Yafei Han, Chuang Chen, Mengzhou Chang, Liping He","doi":"10.1515/jnet-2022-0049","DOIUrl":"https://doi.org/10.1515/jnet-2022-0049","url":null,"abstract":"Abstract In actual operation, the operating environment temperature of thermoelectric devices are constantly changing and rarely remain stable, and the electrical output characteristics of thermoelectric devices are largely determined by thermoelectric materials. In response to this question, the thermoelectric properties of thermoelectric materials (p and n type Bi 2 Te 3 {mathrm{Bi}_{2}}{mathrm{Te}_{3}}) are measured under different temperature difference environments. The Seebeck coefficient, resistivity, and thermal conductivity of the specimens at T = 300 – 600 KT=300text{--}600hspace{0.1667em}text{K} were measured by CTA-4 and CLA1000 (laser flash method), respectively; the thermal and electrical output responses of the thermoelectric materials under different temperature difference conditions were collected in real time by using a self-built thermoelectric performance test platform, thermal/electrical test system with infrared thermal imager, and voltage acquisition system, respectively. The experimental results show that when the temperature difference between the two ends of the specimen increases uniformly, the electrical output signal amplitude also increases uniformly; when the temperature difference is stable, the two ends of the specimen also produce a stable electrical output signal. After stabilization, the electrical output signal amplitude also decreases uniformly when the temperature decreases at a uniform rate. In the temperature range of 298 ∼ 573 K298sim 573hspace{0.1667em}text{K}, the larger the temperature difference between the two ends of the specimen was, the larger the amplitude of the electrical output signal was after stabilization; and vice versa. The greater the loading rate of the thermal load was, the greater the rate of increase of the electrical output signal amplitude at both ends of the specimen was, and the steady-state equilibrium time required was less.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49267425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A Study of the Nonlinear Thomson Effect Produced by Changing the Current in a Thermoelectric Cooler 改变热电冷却器电流产生的非线性汤姆逊效应的研究

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-16 DOI: 10.1515/jnet-2022-0037

L.G. Lafaurie-Ponce, F. Chejne, Luis M. Ramirez-Aristeguieta, Carlos Gomez

{"title":"A Study of the Nonlinear Thomson Effect Produced by Changing the Current in a Thermoelectric Cooler","authors":"L.G. Lafaurie-Ponce, F. Chejne, Luis M. Ramirez-Aristeguieta, Carlos Gomez","doi":"10.1515/jnet-2022-0037","DOIUrl":"https://doi.org/10.1515/jnet-2022-0037","url":null,"abstract":"Abstract This work describes the nonlinear Thomson effect produced by a transient current source powering a thermoelectric cooler. The electric effect of the capacitive impedance in the semiconductors was considered in the equations as a novelty term that naturally appears by solving the Boltzmann equation to find the mathematical form of the current density. Thus, considering the new term and heath energy balances, a one-dimensional mathematical model for a thermoelectric cooler (TEC) powered by a time-dependent current was developed, finding a new nonlinear Thomson effect in the heath transfer equations. To evaluate the impact of the nonlinear effect on the thermodynamic behavior of the thermoelectric cooler, a continuous, sinusoidal and square-pulse current conditions were simulated. The temperature profile, temporal evolution, and the effective coefficient of performance (COP) were calculated. The results revealed a new thermoelectric heat transfer in addition to the Thomson flow created by virtual junctions throughout the semiconductors caused by the instantaneous change of current. This fact was evidenced by three results: the shifting of the temperature mean value due to the peak current change 0.45 A is 1.68 K1.68hspace{0.1667em}mathrm{K} and 2.56 K2.56hspace{0.1667em}mathrm{K} to sinusoidal and square current supplies, respectively; it was determined that a TEC powered by a square-pulse current signal had greater effective efficacy, having more pronounced cold side supercooling temperature peaks compared to those powered by a constant sinusoidal current signal.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48843893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 6

Impact of Thermal Nonequilibrium on Flow Through a Rotating Disk with Power Law Index in Porous Media Occupied by Ostwald-de-Waele Nanofluid Ostwald de Waele纳米流体占据的多孔介质中热非平衡对幂律指数旋转圆盘流动的影响

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-15 DOI: 10.1515/jnet-2022-0030

E. Ragupathi, D. Prakash, M. Muthtamilselvan, Q. Al‐Mdallal

{"title":"Impact of Thermal Nonequilibrium on Flow Through a Rotating Disk with Power Law Index in Porous Media Occupied by Ostwald-de-Waele Nanofluid","authors":"E. Ragupathi, D. Prakash, M. Muthtamilselvan, Q. Al‐Mdallal","doi":"10.1515/jnet-2022-0030","DOIUrl":"https://doi.org/10.1515/jnet-2022-0030","url":null,"abstract":"Abstract The current study is made to analyze the impact of local thermal nonequilibrium (LTNE) on the steady, incompressible, and viscous Ostwald-de-Waele nano-liquid over a rotating disk in a porous medium with the various power law index, due to many remarkable applications, such as aeronautical systems, rotating machineries, air cleaning machineries, electrical power-generating systems, heat exchangers, gas turbines, centrifugal pumps. To describe the modeling of the nano-liquid, Brownian movement and thermophoresis are employed with the passive control boundaries. Three temperature model is adopted to distinguish the temperature among the fluid, particle, and solid. The governing transport equations have been converted to a system of nonlinear coupled ordinary differential equations by employing von Karman transformation. Numerical results of the flow and heat and transfer characteristics of the fluid, particle, and solid are obtained by applying Runge–Kutta–Fehlberg method (RKF) together with the shooting technique. The numerical results in the present work are compared with the published results for the case of thermal equilibrium and found that they are in good agreement. It is observed that the temperature profile significantly varies with the fluid-particle, fluid-solid interphase heat transfer coefficients and the modified thermal capacity ratios.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47234467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 3

Physical Mathematical Modeling and Simulation Based on Hyperbolic Heat Transfer for High Heating Rate Processes in Biomass Pyrolysis 基于双曲传热的生物质热解过程物理数学建模与仿真

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-10 DOI: 10.1515/jnet-2022-0028

F. Chejne, W. Flórez, J. Maya, Javier Ordoñez-Loza, M. García-Pérez

引用次数: 0

Exergetic and Exergo-Economical Analyses of a Gas-Steam Combined Cycle System 燃气-蒸汽联合循环系统的火用与火用经济性分析

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-09-01 DOI: 10.1515/jnet-2022-0042

G. Gonca, Bulent Guzel

引用次数: 11

Optimal Configuration of Finite Source Heat Engine Cycle for Maximum Output Work with Complex Heat Transfer Law 具有复杂传热规律的最大输出功的有限源热机循环的优化配置

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-07-20 DOI: 10.1515/jnet-2022-0024

Jun Li, Lingen Chen

引用次数: 34

Power Density Analysis and Multi-Objective Optimization for an Irreversible Dual Cycle 不可逆双循环的功率密度分析与多目标优化

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-04-29 DOI: 10.1515/jnet-2021-0083

Y. Ge, Shuangshuang Shi, Lingen Chen, Difeng Zhang, H. Feng

{"title":"Power Density Analysis and Multi-Objective Optimization for an Irreversible Dual Cycle","authors":"Y. Ge, Shuangshuang Shi, Lingen Chen, Difeng Zhang, H. Feng","doi":"10.1515/jnet-2021-0083","DOIUrl":"https://doi.org/10.1515/jnet-2021-0083","url":null,"abstract":"Abstract Considering the various irreversibility conditions caused by heat transfer and working processes in a dual cycle, the power density performance is optimized by applying finite-time thermodynamics theory, and multi-objective optimization is performed by using NSGA-II. The effects of cut-off ratio, maximum cycle temperature ratio, and various losses by heat transfer and working processes on the relationships between the power density and the compression ratio and between the power density and the thermal efficiency are analyzed. The thermal efficiency and engine size obtained under the conditions of maximum power output and power density are discussed. The results show that for a dual cycle, the heat engine has a smaller size and higher thermal efficiency under the condition of maximum power density. The cycle compression ratio and cut-off ratio are selected as decision variables, and the dimensionless power output, thermal efficiency, dimensionless ecological function, and dimensionless power density are selected as objective functions. Multi-objective optimization is performed with different objective combinations. The deviation indexes under the LINMAP, TOPSIS, and Shannon entropy approaches are discussed, and the number of generations when the genetic algorithm reaches convergence are obtained. The results show that the genetic algorithm converges at the 341st generation for the quadru-objective optimization, at the 488th generation for the tri-objective optimization, and at the 399th generation for the bi-objective optimization. When the bi-objective optimization is performed with dimensionless power output and dimensionless ecological function as the objective functions, the deviation index obtained based on the LINMAP approach is 0.1400, which is better than those obtained for other single- and multi-objective optimizations.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47172874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 40