Journal of Non-Equilibrium Thermodynamics最新文献_第2页

Mass transfer at vapor-liquid interfaces of H2O + CO2 mixtures studied by molecular dynamics simulation 通过分子动力学模拟研究 H2O + CO2 混合物汽液界面的传质问题

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-07-16 DOI: 10.1515/jnet-2024-0010

Simon Stephan, Vilde Bråten, Hans Hasse

引用次数: 0

Thermoeconomic optimization with a dissipation cost 有耗散成本的热经济优化

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-06-18 DOI: 10.1515/jnet-2023-0089

A. Ares de Parga-Regalado, Gonzalo Ares de Parga

{"title":"Thermoeconomic optimization with a dissipation cost","authors":"A. Ares de Parga-Regalado, Gonzalo Ares de Parga","doi":"10.1515/jnet-2023-0089","DOIUrl":"https://doi.org/10.1515/jnet-2023-0089","url":null,"abstract":"Abstract From a finite-time thermodynamics perspective, a thermoeconomic analysis of a Novikov model employing a linear heat transfer law is carried out. A new component in the cost function is proposed to examine its relationship with waste management while operating in the maximum power, ecological, and efficient power regimes. The methodology consists of optimizing the profit function by including our new waste management cost function, leveraging the same method used by DeVos (“Endoreversible thermoeconomics,” Energy Convers. Manage., vol. 36, pp. 1–5, 1995) and Pacheco et al. (“Thermoeconomic optimization of an irreversible novikov plant model under different regimes of performance,” Entropy, vol. 19, p. 118, 2017). Searching for the optimal thermoeconomic efficiencies for the ecological case a novel numerical method developed by the corresponding author (A. M. Ares de Parga-Regalado, “Analytical approximation of optimal thermoeconomic efficiencies for a novikov engine with a Stefan–Boltzmann heat transfer law,” Results Phys., 2023) is used. Analytical expressions for the optimal efficiencies are obtained, and the impact of the proposed term on these values is investigated.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141334949","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

Kinetic and thermodynamic approach to precisely solve the unsteady Rayleigh flow problem of a rarefied homogeneous charged gas under external force influence 用动力学和热力学方法精确求解外力影响下稀薄均质带电气体的非稳态瑞利流问题

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-06-13 DOI: 10.1515/jnet-2024-0022

Taha Zakaraia Abdel Wahid, Z. M. Alaofi

{"title":"Kinetic and thermodynamic approach to precisely solve the unsteady Rayleigh flow problem of a rarefied homogeneous charged gas under external force influence","authors":"Taha Zakaraia Abdel Wahid, Z. M. Alaofi","doi":"10.1515/jnet-2024-0022","DOIUrl":"https://doi.org/10.1515/jnet-2024-0022","url":null,"abstract":"Abstract An extension and further development of our previous article [J. Non-equilibrium Thermodyne. 37 (2012), 119–141] is presented. We study the irreversible non-equilibrium thermodynamics (INT) properties of the exact solution to the dilute homogeneously charged gas problem with unsteady Rayleigh flow. In contrast to previous research, the charged gas flows under the influence of an external force, the flat plate oscillates, and the displacement current term is considered, leading to significant advancements in understanding natural plasma dynamics. We are solving the Boltzmann kinetic equation (BKE) Krook model supplemented by Maxwell’s equations. We used a travelling wave and moments method with an electron velocity distribution function (EVDF). To the best of our knowledge, as three new scientific achievements, we introduced a new mathematical model for calculating the thermodynamic forces, kinetic coefficients, and fluxes variables, Equations (28–40) and (50–54). Second, we determined, with reasonable accuracy, the thermodynamic equilibrium time of electrons, t equ = 26.7955, under an external force. We clarify the difference between equilibrium EVDF and perturbed EVDF and take advantage of BKE to account for non-equilibrium thermodynamic principles. For diamagnetic and paramagnetic plasmas, the extended Gibbs equation predicts ratios between various contributions to the internal energy change (IEC) is presented. A standard laboratory argon plasma model is used to apply the results.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141346297","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

Application of discrete symmetry to natural convection in vertical porous microchannels 离散对称性在垂直多孔微通道自然对流中的应用

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-06-12 DOI: 10.1515/jnet-2024-0006

A. Avramenko, I. Shevchuk, M. Kovetskaya, Y. Kovetska, A.S. Kobzar

{"title":"Application of discrete symmetry to natural convection in vertical porous microchannels","authors":"A. Avramenko, I. Shevchuk, M. Kovetskaya, Y. Kovetska, A.S. Kobzar","doi":"10.1515/jnet-2024-0006","DOIUrl":"https://doi.org/10.1515/jnet-2024-0006","url":null,"abstract":"Abstract This work focuses on the study of natural convection in a flat porous microchannel with asymmetric heating. The novelty of the work lies in the fact that for the first time the method of discrete symmetries was used to analyze the complete system of Navier–Stokes and energy equations in a two-dimensional approximation. Analytical solutions for velocity and temperature profiles have been derived based on symmetry analysis, taking into account boundary conditions such as slip and temperature jump at the channel walls. The effect of Grashof, Knudsen, Darcy, and Prandtl numbers on the flow characteristics in the microchannel and heat transfer coefficients was elucidated. At high Grashof numbers, an ascending flow near the hot wall and a descending flow near the cold wall arise. Increasing the Knudsen number leads to an increase in the velocity, temperature jump at the walls and a decrease in heat transfer coefficients. As the Darcy number increases, velocities amplify in both ascending and descending flows. The temperature jump at the hot wall grows up, while it remains unchanged at the cold wall. In the same time, the heat transfer coefficient at the hot wall decreases.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141352051","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

Transient cold-front-water through y-shaped aluminium ducts: nature of turbulence, non-equilibrium thermodynamics, and velocity at the converged and diverged outlets 瞬态冷锋水通过 Y 型铝制管道：湍流的性质、非平衡热力学以及汇聚和发散出口处的速度

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-06-06 DOI: 10.1515/jnet-2024-0011

Fuzhang Wang, I. L. Animasaun, Dalal Matar Al Shamsi, Taseer Muhammad, Asgar Ali

{"title":"Transient cold-front-water through y-shaped aluminium ducts: nature of turbulence, non-equilibrium thermodynamics, and velocity at the converged and diverged outlets","authors":"Fuzhang Wang, I. L. Animasaun, Dalal Matar Al Shamsi, Taseer Muhammad, Asgar Ali","doi":"10.1515/jnet-2024-0011","DOIUrl":"https://doi.org/10.1515/jnet-2024-0011","url":null,"abstract":"Abstract The interaction between water motion efficiency, outlet control mechanisms, and energy dynamics management hinges significantly on turbulence characteristics. However, understanding the influence of input velocities and duct features on outlets remains elusive. This study employs the realizable k − ɛ viscous model and Reynolds-averaged Navier–Stokes equations (RANS equations) to explore transient water dynamics encountering a cold front through ducts leading to convergence or divergence. Using Ansys Fluent 2023R2 and the waterlight workflow, meticulous meshing of the ducts is executed to capture flow intricacies accurately. Grid independence, suitable boundary conditions, and solver settings are carefully considered to ensure reliable results for investigating four key research questions. Duct bending introduces non-uniformities in velocity distribution, impacting exit velocity and altering flow characteristics and turbulence. In Case III, centrifugal forces from a 90° bend result in higher outlet velocities at the convergent exit and secondary flow patterns like swirls and vortexes. Additionally, entrance velocities influence Reynolds numbers, affecting mixing, heat transfer coefficients, and flow regimes, thereby optimizing thermal conductivity. This comprehensive investigation sheds light on optimizing water dynamics and energy management across various duct configurations, offering valuable insights into efficient flow control and thermal performance enhancement.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141375956","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

Generalized energy-conserving dissipative particle dynamics with mass transfer: coupling between energy and mass exchange 具有质量转移的广义能量守恒耗散粒子动力学：能量和质量交换之间的耦合

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-05-30 DOI: 10.1515/jnet-2023-0129

Giuseppe Colella, Allan D. Mackie, James P. Larentzos, John K. Brennan, Martin Lísal, Josep Bonet Avalos

{"title":"Generalized energy-conserving dissipative particle dynamics with mass transfer: coupling between energy and mass exchange","authors":"Giuseppe Colella, Allan D. Mackie, James P. Larentzos, John K. Brennan, Martin Lísal, Josep Bonet Avalos","doi":"10.1515/jnet-2023-0129","DOIUrl":"https://doi.org/10.1515/jnet-2023-0129","url":null,"abstract":"The complete description of energy and material transport within the Generalized energy-conserving dissipative particle dynamics with mass transfer (GenDPDE-M) methodology is presented. In particular, the dynamic coupling between mass and energy is incorporated into the GenDPDE-M, which was previously introduced with dynamically decoupled fluxes (J. Bonet Avalos et al., J. Chem. Theory Comput., 18 (12): 7639–7652, 2022). From a theoretical perspective, we have derived the appropriate Fluctuation-Dissipation theorems along with Onsager’s reciprocal relations, suitable for mesoscale models featuring this coupling. Equilibrium and non-equilibrium simulations are performed to demonstrate the internal thermodynamic consistency of the method, as well as the ability to capture the Ludwig–Soret effect, and tune its strength through the mesoscopic parameters. In view of the completeness of the presented approach, GenDPDE-M is the most general Lagrangian method to deal with complex fluids and systems at the mesoscale, where thermal agitation is relevant.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141182431","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

Power and efficient power optimization of one-qubit Novikov quantum heat engines with an external dissipative heat leak 带有外部耗散热泄漏的单量子位诺维科夫量子热引擎的功率和高效功率优化

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-05-29 DOI: 10.1515/jnet-2023-0118

Julio Juan Fernández

引用次数: 0

Thermodiffusion, diffusion and Soret coefficients of binary polymeric mixtures in toluene and cyclohexane 甲苯和环己烷中二元聚合物混合物的热扩散、扩散和索雷特系数

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-05-24 DOI: 10.1515/jnet-2023-0125

Antton Sanjuan, Daniel Sommermann, Werner Köhler, Valentina Shevtsova, M. Mounir Bou-Ali

{"title":"Thermodiffusion, diffusion and Soret coefficients of binary polymeric mixtures in toluene and cyclohexane","authors":"Antton Sanjuan, Daniel Sommermann, Werner Köhler, Valentina Shevtsova, M. Mounir Bou-Ali","doi":"10.1515/jnet-2023-0125","DOIUrl":"https://doi.org/10.1515/jnet-2023-0125","url":null,"abstract":"We present the results of experimental study on measuring the thermodiffusion, molecular diffusion and Soret coefficients of polystyrene (4,880 g/mol) in the pure solvents toluene and cyclohexane at 298 K and atmospheric pressure. The experiments have been carried out for a wide range of concentrations, starting from the diluted state with 2 % polystyrene mass fraction (proposed in the DCMIX4 project) up to the semidilute regime of 20 % polystyrene mass fraction. In addition, we present a complete characterisation of the thermophysical properties of the analysed mixtures. Thermodiffusion, molecular diffusion and Soret coefficients of binary polymeric samples have been measured by combining the traditional thermogravitational column technique, the thermogravitational microcolumn and the optical beam deflection method. In toluene, the obtained experimental results are consistent with literature, showing that the magnitude of the mass transport thermoproperties decrease significantly with increasing polystyrene concentration, which is a first indication of an approaching glass transition in the concentrated regime. The results for thermodiffusion and molecular diffusion coefficients in cyclohexane as a function of concentration exhibit a similar trend. Nevertheless, the Soret coefficient seems to show an opposite tendency for the two solvents, increasing in magnitude for cyclohexane, at least up to the analysed polystyrene concentration.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141096700","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

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

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

引用次数: 0