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Inconsistency between the micropolar theory and non-equilibrium thermodynamics in the case of polar fluids 极性流体微波理论与非平衡热力学之间的不一致性
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-04-30 DOI: 10.1515/jnet-2023-0106
Pavlos S. Stephanou
{"title":"Inconsistency between the micropolar theory and non-equilibrium thermodynamics in the case of polar fluids","authors":"Pavlos S. Stephanou","doi":"10.1515/jnet-2023-0106","DOIUrl":"https://doi.org/10.1515/jnet-2023-0106","url":null,"abstract":"The balance equation of angular momentum in anisotropic fluids includes a couple stress contribution, also responsible for an antisymmetric contribution to the force stress tensor. We herein derive all balance equations for the simplest anisotropic fluid, i.e., a polar fluid, using the GENERIC formalism of non-equilibrium thermodynamics. In doing so, we find that there is an inconsistency between the internal energy density evolution equation derived using non-equilibrium thermodynamics and the one usually considered in micropolar theory.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"56 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140819166","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 double-pass optical beam deflection instrument for the measurement of diffusion, thermodiffusion and Soret coefficients in liquid mixtures and its application to polymer analysis 用于测量液体混合物中的扩散系数、热扩散系数和索雷特系数的双通道光束偏转仪及其在聚合物分析中的应用
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-04-24 DOI: 10.1515/jnet-2023-0104
Roman Reh, Mareike Hager, Werner Köhler
{"title":"A double-pass optical beam deflection instrument for the measurement of diffusion, thermodiffusion and Soret coefficients in liquid mixtures and its application to polymer analysis","authors":"Roman Reh, Mareike Hager, Werner Köhler","doi":"10.1515/jnet-2023-0104","DOIUrl":"https://doi.org/10.1515/jnet-2023-0104","url":null,"abstract":"We have developed a new double-pass optical beam deflection instrument for the measurement of diffusion, thermodiffusion and Soret coefficients in liquid mixtures. The increased sensitivity of the instrument results from a second passage of the readout laser beam through the Soret cell containing the sample. An elegant description of the total beam deflection is achieved by means of a transfer matrix formalism. The higher sensitivity allows for a reduction of the length of the detection arm and a compact and stiff design of the instrument. The performance of the new apparatus is demonstrated by its application to polymer analysis for the determination of the molar mass distribution of the polymer from the distribution of diffusion rates by means of the CONTIN algorithm.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"43 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140642608","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
Lack-of-fit reduction in non-equilibrium thermodynamics applied to the Kac–Zwanzig model 将非平衡热力学中的拟合缺陷还原应用于 Kac-Zwanzig 模型
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-04-08 DOI: 10.1515/jnet-2023-0110
Kateřina Mladá, Martin Šípka, Michal Pavelka
{"title":"Lack-of-fit reduction in non-equilibrium thermodynamics applied to the Kac–Zwanzig model","authors":"Kateřina Mladá, Martin Šípka, Michal Pavelka","doi":"10.1515/jnet-2023-0110","DOIUrl":"https://doi.org/10.1515/jnet-2023-0110","url":null,"abstract":"Even when microscopic particle dynamics is purely mechanistic and thus reversible, the behavior of macroscopic systems composed of those particles is irreversible. In other words, effectively irreversible behavior emerges out of purely reversible dynamics when we do not observe all degrees of freedom of the detailed dynamics. But how can we find the irreversible macroscopic evolution equations when we only know the reversible microscopic equations? Using the so-called lack-of-fit reduction, which gives the reduced evolution as a sum of Hamiltonian and gradient dynamics, we reduce the purely Hamiltonian Kac–Zwanzig model to a set of irreversible evolution equations with no fitting parameters.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"77 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140538780","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
Variations on the models of Carnot irreversible thermomechanical engine 卡诺不可逆热力机械发动机模型的变体
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-04-08 DOI: 10.1515/jnet-2023-0109
Michel Feidt, Monica Costea
{"title":"Variations on the models of Carnot irreversible thermomechanical engine","authors":"Michel Feidt, Monica Costea","doi":"10.1515/jnet-2023-0109","DOIUrl":"https://doi.org/10.1515/jnet-2023-0109","url":null,"abstract":"The JETC Conference held in Salerno (June 12–17, 2023) was the opportunity to honor the two centuries anniversary of the booklet publication of Sadi Carnot. The paper reports on a selective review summarizing the evolution of the ideas and concepts proposed by Carnot. We consider mainly: a. The Carnot cycle relative to thermomechanical engine, b. The concept of efficiency (Carnot efficiency), c. The forms of energy (thermal energy or heat, <jats:italic>Q</jats:italic>, and mechanical energy or work, <jats:italic>W</jats:italic>), d. The concept of entropy, rediscovered and completed by Clausius. We show the importance of the energy conversion irreversibilities that started to be considered more recently by two methods, namely, the ratio method and the entropy production method. The second approach provides more significant results from a global point of view, also with more local modeling (cycle process modeling). Some examples are given that illustrate the proposal: Carnot cycle in endo-irreversible or exo-reversible configuration, Chambadal modeling, Curzon–Ahlborn modeling. More generally, the modeling is done in the frame of FTT (Finite Time Thermodynamics), FST (Finite Speed Thermodynamics), or FDOT (Finite physical Dimensions Optimal Thermodynamics). Preliminary conclusions and perspectives are proposed.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"1 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140538680","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
Proposing a procedure for multi-objective optimization of cascade thermoelectric coolers to achieve maximum cooling capacity and COP 提出一种多目标优化级联热电冷却器的程序，以实现最大冷却能力和 COP
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-03-22 DOI: 10.1515/jnet-2023-0087
Amin Hadidi
{"title":"Proposing a procedure for multi-objective optimization of cascade thermoelectric coolers to achieve maximum cooling capacity and COP","authors":"Amin Hadidi","doi":"10.1515/jnet-2023-0087","DOIUrl":"https://doi.org/10.1515/jnet-2023-0087","url":null,"abstract":"A novel approach is proposed for optimal designing two-stage thermoelectric coolers using the biogeography-based optimization algorithm. For the comprehensiveness of the research, both types of two-stage coolers, including electrically serial and separated stages, have been investigated. Using the proposed procedure, first by selecting the most important performance parameters of the cooler, i.e. COP and the cooling capacity as objective functions, the efficiency and the validity of the approach are proved by comparing the results with results of the previous researchers. In all the examined cases, the proposed approach has led to the enhancing of the cooler performance. The results of single-objective optimization showed that using the proposed method, the cooling capacity and COP can be improved up to 17 % and 8.5 % compared to the previous designs, respectively. In the following, multi-objective optimization of thermoelectric coolers is conducted, taking into account both the objectives of the COP and the cooling capacity. Finally, Pareto optimal solutions and the exergetic efficiency of the optimized cooler were calculated for different values of the weight factor of the multi-objective function. The results of multi-objective optimization showed that by increasing the COP weight factor in the objective function, the exergetic efficiency of the refrigeration system enhances.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"32 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140192494","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
Poroacoustic front propagation under the linearized Eringen–Cattaneo–Christov–Straughan model 线性化 Eringen-Cattaneo-Christov-Straughan 模型下的咽腔声前传播
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-03-19 DOI: 10.1515/jnet-2023-0121
Vittorio Zampoli, Pedro M. Jordan
{"title":"Poroacoustic front propagation under the linearized Eringen–Cattaneo–Christov–Straughan model","authors":"Vittorio Zampoli, Pedro M. Jordan","doi":"10.1515/jnet-2023-0121","DOIUrl":"https://doi.org/10.1515/jnet-2023-0121","url":null,"abstract":"Employing the Laplace transform and its properties, we investigate the evolution of the coupled thermal and fluid-acoustic waveforms that arise in a signaling problem under the Eringen–Cattaneo–Christov–Straughan model of poroacoustic phenomena. Assuming a Heaviside temperature input, we determine the effects of what we term the “Eringen coefficient” by examining the propagation and evolution of the resulting shock and/or acceleration waveforms. Special/limiting cases are also discussed and, in the final section of this Note, possible follow-on studies are suggested.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"42 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140164589","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
The wall effect in a plane counterflow channel 平面逆流水道中的壁面效应
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-03-19 DOI: 10.1515/jnet-2023-0123
Luca Galantucci, Michele Sciacca
{"title":"The wall effect in a plane counterflow channel","authors":"Luca Galantucci, Michele Sciacca","doi":"10.1515/jnet-2023-0123","DOIUrl":"https://doi.org/10.1515/jnet-2023-0123","url":null,"abstract":"In this paper, we study the influence of the boundary conditions of the velocity fields in superfluid helium counterflow experiments. To make progress, we perform numerical simulations where we allow a slip velocity of the viscous component at the walls, and observe how this impacts on velocity fields and density profiles of distribution of quantized vortices. We conclude that the presence of a slip velocity at the walls generates a more homogeneous vortex distribution throughout the channel.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"25 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140164582","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
Corrigendum to: Significance of entropy generation and the Coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs) 更正：熵产生和科里奥利力对输送碳纳米管（SWCNTs 和 MWCNTs）的乙烯-乙二醇三维非达西流动的意义
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-03-12 DOI: 10.1515/jnet-2023-0102
Ikram Ullah, Tasawar Hayat, Arsalan Aziz, Ahmed Alsaedi
{"title":"Corrigendum to: Significance of entropy generation and the Coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs)","authors":"Ikram Ullah, Tasawar Hayat, Arsalan Aziz, Ahmed Alsaedi","doi":"10.1515/jnet-2023-0102","DOIUrl":"https://doi.org/10.1515/jnet-2023-0102","url":null,"abstract":"This corrigendum addresses some typographical mistakes and errors in published article “Significance of entropy generation and the Coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs)”. Corrections about some typographical errors and plots of <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mi>g</m:mi> <m:mfenced close=\")\" open=\"(\"> <m:mrow> <m:mi>η</m:mi> </m:mrow> </m:mfenced> </m:math> <jats:tex-math> $gleft(eta right)$ </jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_jnetdy-2023-0102_ineq_001.png\" /> </jats:alternatives> </jats:inline-formula> satisfying ambient condition in study (I. Ullah, T. Hayat, A. Aziz, and A. Alsaedi, “Significance of entropy generation and the coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs),” <jats:italic>J. Non-Equilibrium Thermodyn.</jats:italic>, vol. 47, pp. 61–75, 2022) are presented here.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"14 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140115307","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
On the dynamic thermal conductivity and diffusivity observed in heat pulse experiments 热脉冲实验中观察到的动态热导率和扩散率
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-03-11 DOI: 10.1515/jnet-2023-0119
Anna Fehér, Róbert Kovács
{"title":"On the dynamic thermal conductivity and diffusivity observed in heat pulse experiments","authors":"Anna Fehér, Róbert Kovács","doi":"10.1515/jnet-2023-0119","DOIUrl":"https://doi.org/10.1515/jnet-2023-0119","url":null,"abstract":"Determining the thermal properties of materials with complex structures is still a major engineering challenge today. The well-known heat pulse experiment can be used to determine the thermal diffusivity by measuring the temperature history as a thermal response for a fast excitation. However, the evaluation of the measurements can be challenging, especially when dealing with non-homogeneous samples. The thermal behavior of such heterogeneous materials may exhibit a response including two-time scales. Therefore, the Fourier equation is not necessarily applicable. The simplest possible alternatives are the 2-temperature models the Guyer–Krumhansl and Jeffreys heat equations. In the present paper, we focus on the interpretation of the Jeffreys heat equation; studying its analytical solution, we present a fitting method for determining the unknown parameters. We also discuss its relation with the other two heat equations, and we offer an interpretation of how to characterize the transient response of heterogeneous materials.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"42 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140104673","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
Optimization analysis of an endoreversible quantum heat engine with efficient power function 具有高效功率函数的内可逆量子热机的优化分析
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-02-14 DOI: 10.1515/jnet-2023-0082
Kirandeep Kaur, Anmol Jain, Love Sahajbir Singh, Rakesh Singla, Shishram Rebari
{"title":"Optimization analysis of an endoreversible quantum heat engine with efficient power function","authors":"Kirandeep Kaur, Anmol Jain, Love Sahajbir Singh, Rakesh Singla, Shishram Rebari","doi":"10.1515/jnet-2023-0082","DOIUrl":"https://doi.org/10.1515/jnet-2023-0082","url":null,"abstract":"We study the optimal performance of an endoreversible quantum dot heat engine, in which the heat transfer between the system and baths is mediated by qubits, operating under the conditions of a trade-off objective function known as the maximum efficient power function defined by the product of power and efficiency of the engine. First, we numerically study the optimization of the efficient power function for the engine under consideration. Then, we obtain some analytic results by applying a high-temperature limit and compare the performance of the engine at maximum efficient power function to the engine operating in the maximum power regime. We find that the engine operating at maximum efficient power function produces at least 88.89 % of the maximum power output while at the same time reducing the power loss due to entropy production by a considerable amount. We conclude by studying the stochastic simulations of the efficiency of the engine in maximum power and maximum efficient power regime. We find that the engine operating at maximum power is subjected to fewer power fluctuations as compared to the one operating at maximum efficient power function.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"184 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139739500","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
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