样式： 排序： IF:  GO 导出 标记为已读

Lackoffit reduction in nonequilibrium thermodynamics applied to the Kac–Zwanzig model J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240408
Kateřina Mladá, Martin Šípka, Michal PavelkaEven 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

Variations on the models of Carnot irreversible thermomechanical engine J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240408
Michel Feidt, Monica CosteaThe 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

Proposing a procedure for multiobjective optimization of cascade thermoelectric coolers to achieve maximum cooling capacity and COP J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240322
Amin HadidiA novel approach is proposed for optimal designing twostage thermoelectric coolers using the biogeographybased optimization algorithm. For the comprehensiveness of the research, both types of twostage 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

Poroacoustic front propagation under the linearized Eringen–Cattaneo–Christov–Straughan model J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240319
Vittorio Zampoli, Pedro M. JordanEmploying the Laplace transform and its properties, we investigate the evolution of the coupled thermal and fluidacoustic 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

The wall effect in a plane counterflow channel J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240319
Luca Galantucci, Michele SciaccaIn 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

Corrigendum to: Significance of entropy generation and the Coriolis force on the threedimensional nonDarcy flow of ethyleneglycol conveying carbon nanotubes (SWCNTs and MWCNTs) J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240312
Ikram Ullah, Tasawar Hayat, Arsalan Aziz, Ahmed AlsaediThis corrigendum addresses some typographical mistakes and errors in published article “Significance of entropy generation and the Coriolis force on the threedimensional nonDarcy flow of ethyleneglycol conveying carbon nanotubes (SWCNTs and MWCNTs)”. Corrections about some typographical errors and plots of g η $g\left(\eta \right)$ satisfying ambient condition in study (I. Ullah, T. Hayat, A. Aziz

On the dynamic thermal conductivity and diffusivity observed in heat pulse experiments J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240311
Anna Fehér, Róbert KovácsDetermining the thermal properties of materials with complex structures is still a major engineering challenge today. The wellknown 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 nonhomogeneous samples

Optimization analysis of an endoreversible quantum heat engine with efficient power function J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240214
Kirandeep Kaur, Anmol Jain, Love Sahajbir Singh, Rakesh Singla, Shishram RebariWe 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 tradeoff 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

Modeling equilibrium and nonequilibrium thermophysical properties of liquid lubricants using semiempirical approaches and neural network J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240208
Sayed Mostafa Hosseini, Taleb Zarei, Mariano PierantozziThis study explored the capability of semiempirical and neural network approaches for correlating and predicting some equilibrium and nonequilibrium thermophysical properties of liquid lubricants. The equilibrium properties, including the densities and several thermodynamic coefficients for 12 liquid lubricants, were correlated and predicted through a perturbed hardchain equation of state (PHC EoS)

Hydrodynamic, electronic and optic analogies with heat transport in extended thermodynamics J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240126
Vito Antonio Cimmelli, David Jou, Antonio SellittoOver the last twentyfive years, the search for generalized equations that allow us to better understand the phenomenon of heat conduction has become an active frontier both in transport theory, and in nonequilibrium thermodynamics, due to the growing interest in nanotechnologies, thermal metamaterials and fast devices. Here we review how some mathematical analogies between generalized heattransport

Thermodynamic costs of temperature stabilization in logically irreversible computation J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240126
ShuNan Li, BingYang CaoIn recent years, great efforts are devoted to reducing the work cost of the bit operation, but it is still unclear whether these efforts are sufficient for resolving the temperature stabilization problem in computation. By combining information thermodynamics and a generalized constitutive model which can describe Fourier heat conduction as well as nonFourier heat transport with nonlocal effects,

Optimized quantum drift diffusion model for a resonant tunneling diode J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240123
Orazio Muscato, Giovanni Nastasi, Vittorio Romano, Giorgia VitanzaThe main aim of this work is to optimize a Quantum Drift Diffusion model (QDD) (V. Romano, M. Torrisi, and R. Tracinà, “Approximate solutions to the quantum driftdiffusion model of semiconductors,” J. Math. Phys., vol. 48, p. 023501, 2007; A. El Ayyadi and A. Jüngel, “Semiconductor simulations using a coupled quantum driftdiffusion schrödingerPoisson model,” SIAM J. Appl. Math., vol. 66, no. 2,

Thermodynamics of micro and nanoscale flow and heat transfer: a minireview J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240122
Yangyu Guo, Moran WangThe modeling and understanding of micro and nanoscale transport processes have raised increasing attention and extensive investigation during the past decades. In this minireview, we aim to summarize our recent progress on the nonequilibrium thermodynamics of micro and nanoscale flow and heat transfer. Special emphasis is put on the entropy generation at the interface, which plays a dominant

Revisit nonequilibrium thermodynamics based on thermomass theory and its applications in nanosystems J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240122
Renjie Hua, Yuan DongThe development of nonFourier heat conduction models is encouraged by the invalidity of Fourier’s law to explain heat conduction in ultrafast or ultrasmall systems. The production of negative entropy will result from the combination of traditional nonequlibrium thermodynamics and nonFourier heat conduction models. To resolve this paradox, extended irreversible thermodynamics (EIT) introduces a new

Heat transfer within nonequilibrium dense aluminum heated by a heavy ion beam J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240122
Chiwan Song, Seongmin Lee, Woosuk BangEnergetic laseraccelerated ions can heat a small soliddensity sample homogeneously to temperatures over 10,000 K in less than a nanosecond. During this brief heating time, the electron temperature of the sample rises first, and then the ion temperature increases owing to the heat transfer between the hot electrons and cold ions. Since energy deposition from the incident heavy ion beam continues concurrently

Thermal and electrical properties of photovoltaic cell with linear phenomenological heat transfer law J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240105
Jun Li, Lingen ChenThe thermal and electrical properties of photovoltaic cell (PVC) under linear phenomenological heat transfer law between it and the environment is studied through finite time thermodynamics and the voltampere characteristic equation. The properties of PVC are affected by heat transfer between PVC and environment. There are optimal solar radiation intensity and PVC output voltage (OV), which make the

Strategies to improve the thermal performance of solar collectors J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20240105
Bader AlshuraiaanThe paper evaluates a passive method for heat transfer improvement in heat exchangers, which implies the use of nanofluids. All calculations were carried out with a constant volumetric flow rate. The study examines three fluids with 0–4 % volume concentrations of CuO, MgO, and Al2O3 particles. The results indicate an increase in the heat transfer coefficient with increasing temperature. An Al2O3 nanofluid

On the influence of the fourth order orientation tensor on the dynamics of the second order one J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231216
Christina PapenfussThe consequences of introducing the fourth order orientation tensor as an independent variable in addition to the second order one are investigated. In the first part consequences of the Second Law of Thermodynamics are exploited. The cases with the second order alignment tensor in the state space on one hand and with the second and fourth order alignment tensors on the other hand are analogous. In

OnsagerCasimir reciprocal relations as a consequence of the equivalence between irreversibility and dissipation J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231214
Václav Klika, Sylvain D. BréchetThe equivalence between irreversibility and dissipation entails that the Onsager reciprocal relations hold unconditionally, requiring the part of the phenomenological matrix describing dissipative phenomena to be symmetric. The antisymmetric part of the phenomenological matrix corresponds to the Casimir’s variant of the reciprocal relations and describes reversible phenomena. Further, we discuss the

Buoyancy driven convection with a Cattaneo flux model J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231214
Brian Straughan, Vincenzo Tibullo, Francesca PassarellaWe review models for convective motion which have a flux law of Cattaneo type. This includes thermal convection where the heat flux law is a Cattaneo one. We additionally analyse models where the convective motion is due to a density gradient caused by a concentration of solute. The usual Fick’s law in this case is replaced by a Cattaneo one involving the flux of solute and the concentration gradient

Relativistic hydrodynamics from the singlegenerator bracket formalism of nonequilibrium thermodynamics J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231205
Vlasis G. MavrantzasWe employ the generalized bracket formalism of nonequilibrium thermodynamics by Beris and Edwards to derive Lorentzcovariant timeevolution equations for an imperfect fluid with viscosity, dilatational viscosity, and thermal conductivity. Following closely the analysis presented by Öttinger (Physica A, 259, 1998, 24–42; Physica A, 254, 1998, 433–450) to the same problem but for the GENERIC formalism

Multiobjective optimization of an endoreversible closed Atkinson cycle J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231124
Zheng Gong, Yanlin Ge, Lingen Chen, Huijun FengBased on finitetimethermodynamic theory and the model established in previous literature, the multiobjective optimization analysis for an endoreversible closed Atkinson cycle is conducted through using the NSGAII algorithm. With the final state point temperature (T 2) of cycle compression process as the optimization variable and the thermal efficiency (η), the dimensionless efficient power ( E

The effects of fractional time derivatives in bioheat conduction technique on tumor thermal therapy J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231117
Ibrahim Abbas, Aatef Hobiny, Alaa ElBaryThe article utilizes the fractional bioheat model in spherical coordinates to explain the transfer of heat in living tissues during magnetic hyperthermia treatment for tumors. Maintaining therapeutic temperature is crucial in magnetic fluid hyperthermia, which requires accurate estimations of power dissipation to determine the appropriate number of magnetic particles required for treatment. To address

Strategies to improve the thermal performance of solar collectors J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231025
Bader AlshuraiaanThe paper evaluates a passive method for heat transfer improvement in heat exchangers, which implies the use of nanofluids. All calculations were carried out with a constant volumetric flow rate. The study examines three fluids with 0–4 % volume concentrations of CuO, MgO, and Al2O3 particles. The results indicate an increase in the heat transfer coefficient with increasing temperature. An Al2O3 nanofluid

Multidimensional numerical simulation of thermodynamic and oscillating gas flow processes of a GiffordMcMahon cryocooler J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231021
Debashis Panda, Ashok Kumar Satapathy, Sunil Kr. Sarangi, Upendra BeheraThe GiffordMcMahon cryocoolers are considered to be prominent candidates for the cooling of hightemperature superconducting magnets, liquefaction of permanent gases, helium recondensation in magnetic resonance imaging machines, cooling of superconducting quantum interference device, etc. In this paper, multidimensional numerical simulation is performed to visualize the oscillating heat and fluid

Heat transfer effect on the performance of threeheatreservoir thermal Brownian refrigerator J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20231007
Congzheng Qi, Lingen Chen, Yanlin Ge, Huijun FengA finitetime thermodynamic (FTT) model of threeheatreservoir thermal Brownian refrigerator is established in this paper. This model can be equivalent to the coupling of a thermal Brownian engine and a thermal Brownian refrigerator with heat transfer effects. Expressions for cooling load and coefficient of performance (COP) are derived by combining FTT and nonequilibrium thermodynamics (NET). The

Improved modeling of Janus membrane considering the influence of hydrophilic layer characteristics J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230916
Noha M. Sayed, H. Noby, Kyaw Thu, A. H. ElShazlySome of the previous investigations neglect the mass transfer contribution of the hydrophilic layer for modeling the Janus membrane that is used for direct contact membrane distillation (DCMD). This work studies the impact of adding such resistance on the performance of the DCMD, especially on the temperature polarization coefficient (TPC), thermal efficiency, and permeate flux. The commercial software

Effect of nonideal gas working fluid on power and efficiency performances of an irreversible Otto cycle J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230907
Di Wu, Yanlin Ge, Lingen Chen, Lei TianBased on the irreversible Otto cycle model, applying finitetimethermodynamic theory, this paper takes power and efficiency as the objective functions, further studies the cycle performance under the condition of nonideal gas working fluid, analyzes the effects of different loss items and freedom degree (d) of monatomic gas on the cycle performance, and compares performance differences of ideal gas

Computational radiative transport in complex geometries using orthogonal coordinates J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230904
Md Ershadul Haque, Saad Bin Mansoor, Bekir Sami YilbasRadiative heat transport involving complex geometries is an important area of investigation. The formulation of the transport phenomenon is more involved and consideration of the proper treatment of the irregular geometry becomes necessary for accurate estimation of heat transfer rates. Therefore, the present study focuses on the modeling and the solution of the radiative transfer equation (RTE) in

Investigation of nonequilibrium separation time on the partitioning of cephalexin in an aqueous twophase system composed of glucose and acetonitrile J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230715
Parsa Movahedi, Ali Jalali Qush Qayeh, Javad Rahbar ShahrouziIn order to commercialize aqueous twophase systems (ATPSs), not only the equilibrium data is essential, but also the knowledge of separation mechanisms, kinetics, settling time, and operational conditions are needed. Mixing duration and settling time are the most critical factors affecting separation and biomolecule partitioning in terms of economic aspects. This research aimed to find the desired

Uncovering enzymatic structural adaptations from energy dissipation J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230707
Andrés ArangoRestrepo, Daniel Barragán, J. Miguel RubiWhile genetic mutations, natural selection and environmental pressures are wellknown drivers of enzyme evolution, we show that their structural adaptations are significantly influenced by energy dissipation. Enzymes use chemical energy to do work, which results in a loss of free energy due to the irreversible nature of the process. By assuming that the catalytic process occurs along a potential barrier

Relations between timescales of stochastic thermodynamic observables J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230516
Erez Aghion, Jason R. GreenAny real physical process that produces entropy, dissipates energy as heat, or generates mechanical work must do so on a finite timescale. Recently derived thermodynamic speed limits place bounds on these observables using intrinsic timescales of the process. Here, we derive relationships for the thermodynamic speeds for any composite stochastic observable in terms of the timescales of its individual

Concepts of phenomenological irreversible quantum thermodynamics II: time dependent statistical ensembles of bipartite systems J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230426
Wolfgang MuschikThe widespread opinion is that original quantum mechanics is a reversible theory, but this statement is only true for undecomposed systems that are those systems for which subsystems are out of consideration. Taking subsystems into account, as it is by definition necessary for decomposed systems, the interaction Hamiltonians –which are absent in undecomposed systems– can be a source of irreversibility

Thermodynamic analysis of the effect of rotation on gas adsorption J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230411
Ramonna I. Kosheleva, Thodoris D. Karapantsios, Margaritis Kostoglou, Athanasios Ch. MitropoulosThis study examines the effect of a short term rotation on a system of constant volume. Adsorption of CO2 is performed on Activated Carbon (AC) at 281, 293 and 298 K with a special designed device that allows rotation. The adsorption isotherms were conducted up to 10 bar for both No Rotational (NoROT) and Rotational (ROT) cases. The ROT case refers to 60 s of rotation at 5000 rpm. The experimental

Oblique shock wave in turbulent flow J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230404
Andriy A. Avramenko, Andrii I. Tyrinov, Igor V. Shevchuk, Nataliya P. DmitrenkoThe main attention is paid to the analytical analysis of an oblique shock wave in a turbulent adiabatic gas flow. For this purpose, a modified Rankine–Hugoniot model was obtained. On its basis, a solution was derived for the Rankine–Hugoniot conditions for a gas flow with various degrees of turbulence, as well as the equation of the modified Hugoniot adiabat. The behavior of the velocity of an adiabatic

The entropy production paradox for fractional diffusion J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230317
Karl Heinz Hoffmann, Christopher Essex, Janett Prehl, Kathrin KulmusDispersive diffusion and wave propagation seem to be unconnected and fundamentally different evolution equations. In the context of anomalous diffusion however modeling approaches based on fractional diffusion equations have been presented, which allow to build a continuous bridge between the two regimes. The transition from irreversible dispersive diffusion to reversible wave propagation shows an

Multiscale theory J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230317
Miroslav GrmelaBoltzmann kinetic equation is put into the form of an abstract time evolution equation representing links connecting autonomous mesoscopic dynamical theories involving varying amount of details. In the chronological order we present results that led to the abstract time equation evolution in both state space and the space of vector fields. In the final section we list some open problems.

Generalized Onsager fluxes based on inexact differential 1form J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230306
Qiang Yang, Kuangdai Leng, Man Zhang, Yaoru LiuOnsager fluxes proposed by D.G.B. Edelen assume that the same symmetry, nonlinear Onsager reciprocal relations, holds near and far from equilibrium. This assumption leads to exact differential 1form J ⋅ dX everywhere, where J and X are thermodynamic fluxes and forces, respectively. However, thermodynamic fluxes far from equilibrium are characterized by symmetry breaking, which lead to the inexact

On small local equilibrium systems J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230301
Hans Christian ÖttingerEven for large nonequilibrium systems, local equilibrium subsystems in the presence of strong inhomogeneities may be very small. Such situations typically arise either in the presence of large gradients of temperature, velocity or pressure, or in transition zones between different phases. For small thermodynamic systems, the Euler equation of macroscopic thermodynamics does not hold. One less equation

A practical upperbound efficiency model for solar power plants J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230225
Eduardo GonzálezMora, Ram Poudel, María Dolores DuránGarcíaA generalized model for the maximum work rate extractable from the Sun is developed considering a reversible and an endoreversible system to define a more practical upperbound efficiency for the conversion of solar radiation into work and power. This model is based on a photothermal work extractor in communication with a hightemperature radiation reservoir and a lowtemperature heat sink. Following

Energy production in onequbit quantum Agrawal machines J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230124
Julio J. FernándezWe obtain the power and Ωfunction of onequbit Agrawal quantum heat engines solving the Lindbland equation and using the tools of Finite Time Thermodynamics. We prove that these two thermodynamic functions have their maximum values for efficiencies different to zero and the Carnot efficiency. Finally, analyzing the high temperature limit of AQHEs we discover the range of temperatures for which the

The optimization of heat transfer in thermally convective micropolarbased nanofluid flow by the influence of nanoparticle’s diameter and nanolayer via stretching sheet: sensitivity analysis approach J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230124
Liaqat Ali, Pardeep Kumar, Zahoor Iqbal, Sharifah E. Alhazmi, Sujesh Areekara, M. M. Alqarni, Alphonsa Mathew, Retna ApsariThe proposed study demonstrates the flow phenomenon and thermovariation of a magnetized stretching sheet inducedradiative nanofluid flow. By incorporating the response surface methodology, the heat transfer rate of the thermally convective flow of nanofluid is optimized. The graphene nanomaterial is used in the waterbased nanofluid. A dynamic magnetic field, thermal radiation, and the Cattaneo–Christov

A simplified analysis of the Feynman pallet and ratchet mechanism considering different forms of generated power J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230119
Delfino LadinoLuna, Juan C. ChimalEguía, Juan C. PachecoPaez, Ricardo T. PáezHernándezIn this paper, we analyze the advanced Feynman’s mechanism from the wellknown Feynman’s Lectures on Physics, under the maximum power output, maximum efficient power, and maximum power density criterion. Considering this mechanism like a thermal engine, and using a simplified model, the physical existence regions for these objective functions are shown. We also show their comparison for given values

Conservatively perturbed equilibrium in multiroute catalytic reactions J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230112
Vitaliy R. Trishch, Gregory S. Yablonsky, Denis Constales, Yuriy O. BeznosykThe phenomenon of conservatively perturbedequilibrium (CPE) in multiroute catalytic reactions was studied in the plugflow reactor (PFR). The following multiroute mechanisms were chosen for studying, i.e., the tworoute mechanism with the single common intermediate, the threeroute mechanism with some common steps, and the tworoute mechanism with the single common step and two common intermediates

Natural convection of a viscoelastic Cattaneo–Christov fluid bounded by thick walls with finite thermal conductivity J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230109
Luis Antonio DávalosOrozco, Jose Antonio Ruiz DíazThe linear natural convection of a Maxwell viscoelastic fluid with Cattaneo–Christov heat flux constitutive equation, between two thick walls with finite thermal conductivity is investigated. The viscoelastic fluid and the heat flux have different relaxation times. The main interest is on the curves of criticality for different thicknesses ratio D and thermal conductivities ratio X. In the middle range

The Onsager–Machlup theory of fluctuations and timedependent generalized normal distribution J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230106
Sergey I. SerdyukovGeneralization of the variational formulation of the Onsager–Machlup thermodynamic theory of fluctuation is considered. Within the framework of variational theory, we introduce the timedependent generalized normal distribution and Hamilton–Jacobi equation. The family of higherorder partial differential equations, which generalize classical Fokker–Planck equation, is considered. It is shown that proposed

Impact of wavy porous layer on the hydrodynamic forces and heat transfer of hybrid nanofluid flow in a channel with cavity under the effect of partial magnetic field J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20230106
Shafqat Hussain, Muhammad Amer Qureshi, Sameh E. AhmedThis computational analysis focuses on the effects of porous layer on the flow dynamics, heat transfer and hydrodynamic forces of hybrid nanofluid in a channel having an open cavity fixed with bottom wall in the presence of partial magnetic field. The set of PDEs governing the dynamics has been transformed to dimensionless form and simulated using higher order finite element method. In particular,

New formulation of the Navier–Stokes equations for liquid flows J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221216
Massimiliano Giona, Giuseppe Procopio, Alessandra Adrover, Roberto MauriFor isothermal liquid flows, the condition of incompressibility provides a useful simplification for describing their mechanical properties. Nevertheless, it overlooks acoustic effects, and it provides the unpleasant shortcoming of infinite propagation speed of velocity perturbations, no matter the type of constitutive equation for the shear stresses is adopted. In this paper, we provide a derivation

Are all chemical reactions in principle reversible? Thermodynamic distinction between “conceptually complete” and “practically complete” reactions J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221214
Andrea CiccioliAmong the chemical reactions having a pronounced thermodynamic driving force to the formation of products, a distinction has to be made between processes which attain a chemical equilibrium state very much shifted towards the products and those where the final equilibrium state corresponds to the truly complete consumption of reactant(s), i.e. where a true chemical equilibrium is actually not attained

Maximum ecological function performance for a threereservoir endoreversible chemical pump J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221207
Lingen Chen, Shuangshuang Shi, Huijun Feng, Yanlin GeEndoreversible chemical pump (ECP) is a theoretical model of electrochemical, photochemical, solidstate apparatus and mass exchangers. ECP can be classified as two, three and fourmassreservoir devices. The usual performance indicators for ECPs are energy pumping rate (EPR) and coefficient of performance (COP). Energybased ecological function objective (EFO) is introduced to performance optimization

Minimum power consumption of multistage irreversible Carnot heat pumps with heat transfer law of q ∝ (ΔT) m J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221206
Lingen Chen, Shaojun XiaFor the given initial finite hightemperature heat reservoir temperature, continuous Hamilton–Jacobi–Bellman equations are established to obtain optimal finite hightemperature heat reservoir temperature for minimum power consumption of multistage Carnot heat pumping system with generalized convective heat transfer law [q ∝ (ΔT) m ]. Analytical expression of optimal heat reservoir temperature with

Nonequilibrium thermodynamics modelling of the stressstrain relationship in soft twophase elasticviscoelastic materials J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221206
Pavlos S. Stephanou, Panayiotis Vafeas, Vlasis G. MavrantzasIn “soft–soft nanocomposites” based on film formation of latexes with structured particles, the combination of particle structure and interparticle crosslinking leads to materials that behave as nonlinear viscoelastic fluids at small strains and as highly elastic networks at larger strains. Similarly, in studies of flowinduced crystallization in polymers, a twophase model is often invoked in which

Nonlinear dynamics of blood passing through an overlapped stenotic artery with copper nanoparticles J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221206
Hanumesh Vaidya, Isaac Lare Animasaun, Kerehalli Vinayaka Prasad, Choudhari Rajashekhar, Javalkar U. Viharika, Qasem M. AlMdallalThe dynamics of blood carrying microscopic copper particles through overlapping stenotic arteries is an important research area needed for scrutinizing and exploring dynamics through blood vessels. Adipose tissue deposition and other elements of atherosclerosis generate the uncommon artery disease known as arterial stenosis. It limits blood flow and raises the risk of heart disease. Using the Casson

Densities and isothermal compressibilities from perturbed harddimerchain equation of state: application to nanofluids J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221202
Mahsa Taghizadehfard, Sayed Mostafa Hosseini, Mariano Pierantozzi, Mohammad Mehdi AlavianmehrDensities and isothermal compressibilities of several nanofluids were modelled using a perturbed hardchain equation of state (EoS) by an attractive term from Yukawa tail in 273–363 K range and pressure up to 45 MPa. The nanofluids of interest comprise TiO2Anatase (A), TiO2Rutile (R), SnO2, Co3O4, CuO, ZnO, and Al2O3 as nanoparticles dispersed in ethylene glycol, water, poly ethylene glycol, ethylene

Influence of drive chamber discharging process on nonlinear displacer dynamics and thermodynamic processes of a fluidicdriven GiffordMcMahon cryocooler J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221124
Debashis Panda, Manoj Kumar, Suraj K. Behera, Ashok K. Satapathy, Sunil Kr. SarangiContinuous effort is made on GiffordMcMahon cryocoolers (GMC) to amplify its refrigeration power, so they can be used to cool the cryopumps, high Tc magnets and development of efficient smallscale hydrogen liquefiers, etc. The fluidicdriven GMC is considered to be more reliable and prominent candidate than the mechanicallydriven GMC due to its structural simplicity and reliability. Nonetheless

Maximum work configuration of finite potential source endoreversible nonisothermal chemical engines J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20221118
Lingen Chen, Shaojun XiaChemical engine is an abstract model of some devices, such as solid state, photochemical, and electrochemical devices, photovoltaic cell, and mass exchangers. Finite chemicalpotential 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

Stability Analysis of Double Diffusive Convection in Local Thermal Nonequilibrium Porous Medium with Internal Heat Source and Reaction Effects J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20220919
Najat J. Noon, Shatha A. HaddadThe internal heat source and reaction effects on the onset of thermosolutal convection in a local thermal nonequilibrium porous medium are examined, where the temperature of the fluid and the solid skeleton may differ. The linear instability and nonlinear stability theories of Darcy–Brinkman type with fixed boundary condition are carried out where the layer is heated and salted from below. The D 2

Heat Engine Cycle Configurations for Maximum Work Output with Generalized Models of Reservoir Thermal Capacity and Heat Resistance J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20220915
Lingen Chen, Shaojun XiaA class of two finiteheatreservoir endoreversible heat engine with the generalized models of both the reservoir thermal capacities and heat resistances is investigated. The optimality condition for cycle maximum work output is derived by applying optimal control theory, and impacts of both thermal capacity characteristics of heat reservoirs and heat transfer laws on the optimal configurations are

A Study of the Nonlinear Thomson Effect Produced by Changing the Current in a Thermoelectric Cooler J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20220915
Luis G. LafauriePonce, Farid Chejne, Luis M. RamirezAristeguieta, Carlos A. GomezThis 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

Thermoelectric Response Characteristics of Bi2Te3 Based Semiconductor Materials J. Non Equilib. Thermodyn. (IF 6.6) Pub Date : 20220915
Zhanxuan Wang, Xiulian Cheng, Kai Guo, Enling Tang, Lei Li, Hui Peng, Yafei Han, Chuang Chen, Mengzhou Chang, Liping HeIn 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}}