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Journal of Non-Equilibrium Thermodynamics最新文献

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Phonon hydrodynamics of short channels with entrance-length effects: solids and superfluids 具有入口长度效应的短通道声子流体动力学：固体和超流体
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-04-21 DOI: 10.1515/jnet-2025-0141
Lidia Saluto
{"title":"Phonon hydrodynamics of short channels with entrance-length effects: solids and superfluids","authors":"Lidia Saluto","doi":"10.1515/jnet-2025-0141","DOIUrl":"https://doi.org/10.1515/jnet-2025-0141","url":null,"abstract":"In this paper we propose an expression for the effective thermal conductivity of thin and short channels in the context of non-linear phonon hydrodynamics with entrance-length effects. The channels communicate two thermal reservoirs of the same material than the channel, so that there are no interfaces at the longitudinal boundaries of the channel, but only an abrupt change of the radius. The channels are so short that the fully-developed Poiseuille flow usually assumed in phonon hydrodynamics cannot be reached in the length of the system. The corresponding expression is analogous to that arising in narrow and short channels of superfluid helium between two helium reservoirs at slightly different temperatures.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"263 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147731785","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
Eigenvalue analysis of thermo-mechanical relaxation times in viscoelastic skin tissue 粘弹性皮肤组织热-机械松弛时间特征值分析
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-04-09 DOI: 10.1515/jnet-2025-0168
Zuhur Alqahtani, Ibrahim Abbas, Areej Almuneef
{"title":"Eigenvalue analysis of thermo-mechanical relaxation times in viscoelastic skin tissue","authors":"Zuhur Alqahtani, Ibrahim Abbas, Areej Almuneef","doi":"10.1515/jnet-2025-0168","DOIUrl":"https://doi.org/10.1515/jnet-2025-0168","url":null,"abstract":"This study investigates the thermoviscoelastic behavior of skin tissue under applied heat flux. The analysis uses the Pennes bioheat transfer model and the Kelvin-Voigt model for viscoelastic materials. A governing equation for biothermoviscoelasticity is provided with relevant initial and boundary conditions for a single-layer skin model of finite thickness. Temperature, displacement, and stress in the tissue are computed using a Laplace-transform eigenvalue method, then converted back to the time domain with MATLAB. To understand the effects of the viscosity coefficient, relaxation times of viscosity and thermal conduction, and the characteristic time of pulsing heat flux on the temperature profiles and mechanical deformation, parametric studies are conducted. Displacement, temperature and stress are plotted and presented. In combination, these measures assess the tissue response and provide a theoretical framework to support model refinement and the optimization of thermal therapy.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"67 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147648957","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
Comparison of some geometric frameworks for dissipative evolution in multiscale non-equilibrium thermodynamics 多尺度非平衡热力学耗散演化几何框架的比较
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-03-17 DOI: 10.1515/jnet-2025-0174
Miroslav Grmela, Michal Pavelka
{"title":"Comparison of some geometric frameworks for dissipative evolution in multiscale non-equilibrium thermodynamics","authors":"Miroslav Grmela, Michal Pavelka","doi":"10.1515/jnet-2025-0174","DOIUrl":"https://doi.org/10.1515/jnet-2025-0174","url":null,"abstract":"In this paper, we review and compare some geometric frameworks for dissipation in non-equilibrium thermodynamics. We start with a brief overview of classical irreversible thermodynamics and gradient dynamics. Then we discuss several specific frameworks including Rayleigh dissipation potential and the dissipative d’Alembert framework, showing their relations with gradient dynamics. Finally, we discuss frameworks for dissipative evolution generated from Poisson brackets.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"17 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147471158","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
Rheological modeling with GENERIC and with the Onsager principle 采用GENERIC和Onsager原理进行流变学建模
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-03-07 DOI: 10.1515/jnet-2025-0125
Miroslav Grmela
{"title":"Rheological modeling with GENERIC and with the Onsager principle","authors":"Miroslav Grmela","doi":"10.1515/jnet-2025-0125","DOIUrl":"https://doi.org/10.1515/jnet-2025-0125","url":null,"abstract":"In this paper we compare three frameworks for modeling flows of complex fluids: (i) local conservations of mass, momentum and energy, (ii) GENERIC, and (iii) Onsager principle. The first is based on the mass, momentum, and energy conservation implied by mechanics, the second on the observed approach (in the state space) of externally unforced fluids to thermodynamic equilibrium states, and the third on the approach (in the space of vector fields) of externally driven fluids to dynamics involving less details. The comparison is illustrated on isothermal polymeric fluids.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"32 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147371208","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
Nonequilibrium thermodynamics with constraints: constrained functional derivatives and their transformations 有约束的非平衡热力学：约束泛函导数及其变换
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-02-17 DOI: 10.1515/jnet-2025-0143
Brian J. Edwards, Antony N. Beris
{"title":"Nonequilibrium thermodynamics with constraints: constrained functional derivatives and their transformations","authors":"Brian J. Edwards, Antony N. Beris","doi":"10.1515/jnet-2025-0143","DOIUrl":"https://doi.org/10.1515/jnet-2025-0143","url":null,"abstract":"A general methodology of incorporating physical constraints into applications of bracket theory in nonequilibrium thermodynamics is introduced at the macroscopic level expressed in terms of a set of local field variables. Constraints on the state variables are incorporated into the system description by suitably modifying the functional derivatives due to the presence of constraints through an extension of Lagrange’s method of undetermined multipliers to local field variables, whereby the dynamics of conserved quantities are restricted to submanifolds that are compatible with the imposed constraints. This article presents the mathematical prerequisites of the general methodology and a classification of constraints, along with a discussion of characteristic applications to microstructured materials.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"1 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146204859","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
Dynamics of stochastic chains with harmonic and FPUT potentials 具有谐波和FPUT势的随机链动力学
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-02-16 DOI: 10.1515/jnet-2025-0150
Emilio N.M. Cirillo, Matteo Colangeli, Claudio Giberti, Lamberto Rondoni
{"title":"Dynamics of stochastic chains with harmonic and FPUT potentials","authors":"Emilio N.M. Cirillo, Matteo Colangeli, Claudio Giberti, Lamberto Rondoni","doi":"10.1515/jnet-2025-0150","DOIUrl":"https://doi.org/10.1515/jnet-2025-0150","url":null,"abstract":"Inspired by recent studies on deterministic oscillator models, we introduce a stochastic one-dimensional model for a chain of interacting particles. The model consists of <jats:italic>N</jats:italic> particles performing continuous-time random walks on the integer lattice <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mi mathvariant=\"double-struck\">Z</m:mi> </m:math> <jats:tex-math>$mathbb{Z}$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_jnetdy-2025-0150_ineq_001.png\"/> </jats:alternatives> </jats:inline-formula> with exponentially distributed waiting times. The particles are bound by confining forces to two particles that do not move, placed at positions <jats:italic>x</jats:italic> <jats:sub>0</jats:sub> and <jats:italic>x</jats:italic> <jats:sub> <jats:italic>N</jats:italic> +1 </jats:sub> , respectively, and they feel the presence of baths with given inverse temperatures: <jats:italic>β</jats:italic> <jats:sub> <jats:italic>L</jats:italic> </jats:sub> to the left, <jats:italic>β</jats:italic> <jats:sub> <jats:italic>B</jats:italic> </jats:sub> in the middle, and <jats:italic>β</jats:italic> <jats:sub> <jats:italic>R</jats:italic> </jats:sub> to the right. Each particle has an index and interacts with its nearest neighbors in index space through either a quadratic potential or a Fermi-Pasta-Ulam-Tsingou type coupling. This local interaction in index space can give rise to effective long-range interactions on the spatial lattice, depending on the instantaneous configuration. Particle hopping rates are governed either by the Metropolis rule or by a modified version that breaks detailed balance at the interfaces between regions with different baths. In both cases, the dynamics drive the system toward the minimization of an appropriate energy functional, even under non-uniform temperature profiles.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"10 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146204860","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
Liquid-vapor interface resistivities for non-ideal gases 非理想气体的液-气界面电阻率
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-01-29 DOI: 10.1515/jnet-2025-0104
Henning Struchtrup
{"title":"Liquid-vapor interface resistivities for non-ideal gases","authors":"Henning Struchtrup","doi":"10.1515/jnet-2025-0104","DOIUrl":"https://doi.org/10.1515/jnet-2025-0104","url":null,"abstract":"The classical Hertz–Knudsen–Schrage (HKS) relations for mass and heat transfer across liquid-vapor interfaces are valid for ideal gas vapors only. We propose a generalization of the HKS relations towards non-ideal vapors based on equilibrium and non-equilibrium property relations for a van-der-Waals-like gas obtained from the Enskog–Vlasov kinetic equation, and determine the corresponding dimensionless resistivities for mass and heat transfer across an interface. Considering constant evaporation and accommodation coefficients, it is found that all resistivities decay towards the critical point.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"4 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071514","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
Frontmatter Frontmatter
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2026-01-07 DOI: 10.1515/jnet-2026-frontmatter1
{"title":"Frontmatter","authors":"","doi":"10.1515/jnet-2026-frontmatter1","DOIUrl":"https://doi.org/10.1515/jnet-2026-frontmatter1","url":null,"abstract":"","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"21 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145907700","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
Ecological performance analyses and multi-objective optimizations for thermal-Brownian-engine with external heat-transfer 带外传热的热布朗发动机生态性能分析及多目标优化
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-12-11 DOI: 10.1515/jnet-2025-0083
Congzheng Qi, Lingen Chen, Huijun Feng, Yanlin Ge, Xubing Chen
{"title":"Ecological performance analyses and multi-objective optimizations for thermal-Brownian-engine with external heat-transfer","authors":"Congzheng Qi, Lingen Chen, Huijun Feng, Yanlin Ge, Xubing Chen","doi":"10.1515/jnet-2025-0083","DOIUrl":"https://doi.org/10.1515/jnet-2025-0083","url":null,"abstract":"Based on finite-time-thermodynamics and thermal-Brownian-engine cycle with external heat transfers, expressions for ecological function and efficient ecological function are derived firstly herein. Two temperatures for hot and cold viscous mediums are solved by combining heat flow balance equations, and ecological performances are analyzed. Next, with thermal-conductance-ratio, barrier-height and external-load as optimization variables, 15 combinations including power, efficiency, ecological-function and efficient-ecological-function as optimization objectives, single- and multi-objective optimizations are conducted utilizing non-dominated sorting genetic algorithm-II (NSGA-II), and Pareto frontiers for different combinations are obtained. Finally, the optimal schemes for different multi-objective optimizations are determined using three decision-making methods. Results indicate that this engine can operate under maximal ecological function or efficient ecological function objectives. Ecological-function, efficient-ecological-function and multi-objective optimizations can achieve trade-offs between power and efficiency, and multi-objective optimizations provide more suitable solutions. For four-objective optimization, optimal scheme with Shannon-Entropy method is closer to ideal solution, and barrier height and external load corresponding to Pareto frontier are distributed uniformly within their ranges, while thermal conductance ratio is concentrated around 0.5. Adjusting barrier height and external load is an effective way to achieve coordinated optimization of these four objectives.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"6 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731356","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
Modeling and simulations of nonequilibrium bioheat transfer in biological tissue using FEM with experimental verifications 生物组织内非平衡传热的有限元模拟与实验验证
IF 6.6 3区 工程技术
Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-12-09 DOI: 10.1515/jnet-2025-0152
Areej Almuneef, Ibrahim Abbas
{"title":"Modeling and simulations of nonequilibrium bioheat transfer in biological tissue using FEM with experimental verifications","authors":"Areej Almuneef, Ibrahim Abbas","doi":"10.1515/jnet-2025-0152","DOIUrl":"https://doi.org/10.1515/jnet-2025-0152","url":null,"abstract":"This work provides numerical solution for the dual-phase lag (DPL) theory, which accounts for non-equilibrium heating transfer in cylindrical living tissue during laser irradiation by finite element method. Given the complexity of the governing equation, the solution to such problems is pursued through the implementation of the finite element approach. The assessment of tissue thermal injuries includes determining the span of denatured proteins through the application of the Arrhenius formulation. The results of the finite element method are confirmed as valid by comparing its numerical solution with the data available from the existing experimental data. Furthermore, a comparison with validated experimental data confirms the efficacy of the mathematical model in assessing bioheat transfer in living tissues. The present findings highlight the importance of incorporating dual-phase lags in predictive thermal models to accurately capture the transient response of biological tissues under short-pulse laser exposure.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"29 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145703975","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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