Journal of Non-Equilibrium Thermodynamics最新文献_第10页

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":"47 1","pages":"289 - 309"},"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

Internal Variables as a Tool for Extending Navier-Stokes Equations 内变量作为扩展Navier-Stokes方程的工具

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-04-05 DOI: 10.1515/jnet-2021-0089

A. Berezovski

引用次数: 1

Thermodynamical Foundations of Closed Discrete Non-Equilibrium Systems 封闭离散非平衡系统的热力学基础

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-04-01 DOI: 10.1515/jnet-2021-0064

W. Muschik

引用次数: 1

Nonlinear Thermal Transport with Inertia in Thin Wires: Thermal Fronts and Steady States 细导线中具有惯性的非线性热输运:热锋和稳态

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-03-31 DOI: 10.1515/jnet-2021-0069

M. Sciacca, D. Jou

引用次数: 0

Editorial 社论

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-03-30 DOI: 10.1515/jnet-2022-5003

V. Klika, M. Pavelka

引用次数: 0

Thermotics As an Alternative Nonequilibrium Thermodynamic Approach Suitable for Real Thermoanalytical Measurements: A Short Review 热力学作为一种适用于实际热分析测量的替代非平衡热力学方法：简评

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-03-30 DOI: 10.1515/jnet-2021-0074

J. Šesták, R. Černý

{"title":"Thermotics As an Alternative Nonequilibrium Thermodynamic Approach Suitable for Real Thermoanalytical Measurements: A Short Review","authors":"J. Šesták, R. Černý","doi":"10.1515/jnet-2021-0074","DOIUrl":"https://doi.org/10.1515/jnet-2021-0074","url":null,"abstract":"Abstract The general concept of temperature is thermodynamically defined in equilibrium somehow predictable even for non-equilibrium; however, it presents some still controversial aspects, as has been shown in a number of studies and reviews that have been published so far. Equilibrium concepts are often extrapolated to apply in micro-localized equilibrium and then appended to non-equilibrium in its entirety, which helps to define out-of-equilibrium temperature on both the macroscopic and microscopic bases. Unfortunately, these theoretical analyses do not provide any guidance on how to assess and understand temperature in practical measurements, such as for conventional thermal analysis. Insufficient use of alternative thermodynamic attitudes is evident especially in the field of thermophysical studies, which do not use static measurements, because they usually involve heating from an external source, i. e., the effect of thermal dynamics on the laboratory sample. This paper presents the applied nonequilibrium thermodynamic concept, historically known as thermotics. This approach takes into account the existence of gradients and heat fluxes, which it assesses from the point of view of the average user, and considers additional influences, going beyond the description of thermodynamics in traditional textbooks. The goal is to extend their validity, even to the state of constant first-time derivatives. At the same time, it points to changes in the temperature due to thermal inertia, which has long been ignored, suggesting that the heat spreads immediately. Moreover, special techniques enabling measurements during its extreme changes probably then require an alternative concept for temperature (tempericity). This opinion paper may provide stimuli for further discussion with regard to the practice of measurements done in the customary nonisothermal mode.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"47 1","pages":"233 - 240"},"PeriodicalIF":6.6,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48097957","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

Thermal Shear Waves Induced in Mesoscopic Liquids at Low Frequency Mechanical Deformation 介观液体低频机械变形诱导的热剪切波

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2022-03-14 DOI: 10.1515/jnet-2021-0091

E. Kume, L. Noirez

{"title":"Thermal Shear Waves Induced in Mesoscopic Liquids at Low Frequency Mechanical Deformation","authors":"E. Kume, L. Noirez","doi":"10.1515/jnet-2021-0091","DOIUrl":"https://doi.org/10.1515/jnet-2021-0091","url":null,"abstract":"Abstract We show that a confined viscous liquid emits a dynamic thermal response upon applying a low frequency (∼1 Hz) shear excitation. Hot and cold thermal waves are observed in situ at atmospheric pressure and room temperature, in a viscous liquid (polypropylene glycol) at various thicknesses ranging from 100 µm up to 340 µm, upon applying a mechanical oscillatory shear strain. The observed thermal effects, synchronous with the mechanical excitation, are inconsistent with a viscous behaviour. It indicates that mesoscopic liquids are able to (partly) convert mechanical shear energy in non-equilibrium thermodynamic states. This effect called thermo-elasticity is well known in solid materials. The observation of a thermal coupling to the mechanical shear deformation reinforces the assumption of elastically correlated liquid molecules. The amplitude of the thermo-elastic waves increases linearly by increasing the shear strain amplitude up to a transition to a non-linear thermal behavior, similar to a transition from an elastic to plastic regime. The thermo-elastic effects do not give rise to any change in stress measurements and thus the dynamic thermal analysis provides unique information about dynamic liquid properties.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"47 1","pages":"155 - 163"},"PeriodicalIF":6.6,"publicationDate":"2022-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42055871","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