
样式: 排序: IF: - GO 导出 标记为已读
-
Relations between timescales of stochastic thermodynamic observables J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-05-16 Erez Aghion, Jason R. Green
Any 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 4.29) Pub Date : 2023-04-26 Wolfgang Muschik
The wide-spread 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 sub-systems are out of consideration. Taking sub-systems 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 4.29) Pub Date : 2023-04-11 Ramonna I. Kosheleva, Thodoris D. Karapantsios, Margaritis Kostoglou, Athanasios Ch. Mitropoulos
This 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 4.29) Pub Date : 2023-04-04 Andriy A. Avramenko, Andrii I. Tyrinov, Igor V. Shevchuk, Nataliya P. Dmitrenko
The 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 4.29) Pub Date : 2023-03-17 Karl Heinz Hoffmann, Christopher Essex, Janett Prehl, Kathrin Kulmus
Dispersive 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 4.29) Pub Date : 2023-03-17 Miroslav Grmela
Boltzmann 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 1-form J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-03-06 Qiang Yang, Kuangdai Leng, Man Zhang, Yaoru Liu
Onsager 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 1-form 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 4.29) Pub Date : 2023-03-01 Hans Christian Öttinger
Even 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 upper-bound efficiency model for solar power plants J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-02-25 Eduardo González-Mora, Ram Poudel, María Dolores Durán-García
A 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 upper-bound efficiency for the conversion of solar radiation into work and power. This model is based on a photo-thermal work extractor in communication with a high-temperature radiation reservoir and a low-temperature heat sink. Following
-
Energy production in one-qubit quantum Agrawal machines J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-01-24 Julio J. Fernández
We obtain the power and Ω-function of one-qubit 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 micropolar-based nanofluid flow by the influence of nanoparticle’s diameter and nanolayer via stretching sheet: sensitivity analysis approach J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-01-24 Liaqat Ali, Pardeep Kumar, Zahoor Iqbal, Sharifah E. Alhazmi, Sujesh Areekara, M. M. Alqarni, Alphonsa Mathew, Retna Apsari
The proposed study demonstrates the flow phenomenon and thermo-variation of a magnetized stretching sheet induced-radiative 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 water-based 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 4.29) Pub Date : 2023-01-19 Delfino Ladino-Luna, Juan C. Chimal-Eguía, Juan C. Pacheco-Paez, Ricardo T. Páez-Hernández
In this paper, we analyze the advanced Feynman’s mechanism from the well-known 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 multi-route catalytic reactions J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-01-12 Vitaliy R. Trishch, Gregory S. Yablonsky, Denis Constales, Yuriy O. Beznosyk
The phenomenon of conservatively perturbed-equilibrium (CPE) in multi-route catalytic reactions was studied in the plug-flow reactor (PFR). The following multi-route mechanisms were chosen for studying, i.e., the two-route mechanism with the single common intermediate, the three-route mechanism with some common steps, and the two-route 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 4.29) Pub Date : 2023-01-09 Luis Antonio Dávalos-Orozco, Jose Antonio Ruiz Díaz
The 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 time-dependent generalized normal distribution J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2023-01-06 Sergey I. Serdyukov
Generalization of the variational formulation of the Onsager–Machlup thermodynamic theory of fluctuation is considered. Within the framework of variational theory, we introduce the time-dependent generalized normal distribution and Hamilton–Jacobi equation. The family of higher-order 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 4.29) Pub Date : 2023-01-06 Shafqat Hussain, Muhammad Amer Qureshi, Sameh E. Ahmed
This 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 4.29) Pub Date : 2022-12-16 Massimiliano Giona, Giuseppe Procopio, Alessandra Adrover, Roberto Mauri
For 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 4.29) Pub Date : 2022-12-14 Andrea Ciccioli
Among 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 three-reservoir endoreversible chemical pump J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-12-07 Lingen Chen, Shuangshuang Shi, Huijun Feng, Yanlin Ge
Endoreversible chemical pump (ECP) is a theoretical model of electrochemical, photochemical, solid-state apparatus and mass exchangers. ECP can be classified as two-, three- and four-mass-reservoir devices. The usual performance indicators for ECPs are energy pumping rate (EPR) and coefficient of performance (COP). Energy-based 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 4.29) Pub Date : 2022-12-06 Lingen Chen, Shaojun Xia
For the given initial finite high-temperature heat reservoir temperature, continuous Hamilton–Jacobi–Bellman equations are established to obtain optimal finite high-temperature 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
-
Non-equilibrium thermodynamics modelling of the stress-strain relationship in soft two-phase elastic-viscoelastic materials J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-12-06 Pavlos S. Stephanou, Panayiotis Vafeas, Vlasis G. Mavrantzas
In “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 flow-induced crystallization in polymers, a two-phase model is often invoked in which
-
Nonlinear dynamics of blood passing through an overlapped stenotic artery with copper nanoparticles J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-12-06 Hanumesh Vaidya, Isaac Lare Animasaun, Kerehalli Vinayaka Prasad, Choudhari Rajashekhar, Javalkar U. Viharika, Qasem M. Al-Mdallal
The 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 hard-dimer-chain equation of state: application to nanofluids J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-12-02 Mahsa Taghizadehfard, Sayed Mostafa Hosseini, Mariano Pierantozzi, Mohammad Mehdi Alavianmehr
Densities and isothermal compressibilities of several nanofluids were modelled using a perturbed hard-chain 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 TiO2-Anatase (-A), TiO2-Rutile (-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 non-linear displacer dynamics and thermodynamic processes of a fluidic-driven Gifford-McMahon cryocooler J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-11-24 Debashis Panda, Manoj Kumar, Suraj K. Behera, Ashok K. Satapathy, Sunil Kr. Sarangi
Continuous effort is made on Gifford-McMahon cryocoolers (GMC) to amplify its refrigeration power, so they can be used to cool the cryopumps, high Tc magnets and development of efficient small-scale hydrogen liquefiers, etc. The fluidic-driven GMC is considered to be more reliable and prominent candidate than the mechanically-driven GMC due to its structural simplicity and reliability. Nonetheless
-
Maximum work configuration of finite potential source endoreversible non-isothermal chemical engines J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-11-18 Lingen Chen, Shaojun Xia
Chemical engine is an abstract model of some devices, such as solid state, photochemical, and electrochemical devices, photovoltaic cell, and mass exchangers. Finite chemical-potential 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 Non-equilibrium Porous Medium with Internal Heat Source and Reaction Effects J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-09-19 Najat J. Noon, Shatha A. Haddad
The internal heat source and reaction effects on the onset of thermosolutal convection in a local thermal non-equilibrium 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 4.29) Pub Date : 2022-09-15 Lingen Chen, Shaojun Xia
A class of two finite-heat-reservoir 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 4.29) Pub Date : 2022-09-15 Luis G. Lafaurie-Ponce, Farid Chejne, Luis M. Ramirez-Aristeguieta, Carlos A. Gomez
This 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 4.29) Pub Date : 2022-09-15 Zhanxuan Wang, Xiulian Cheng, Kai Guo, Enling Tang, Lei Li, Hui Peng, Yafei Han, Chuang Chen, Mengzhou Chang, Liping He
In 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}}
-
Impact of Thermal Nonequilibrium on Flow Through a Rotating Disk with Power Law Index in Porous Media Occupied by Ostwald-de-Waele Nanofluid J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-09-14 E. Ragupathi, D. Prakash, M. Muthtamilselvan, Qasem M. Al-Mdallal
The current study is made to analyze the impact of local thermal nonequilibrium (LTNE) on the steady, incompressible, and viscous Ostwald-de-Waele nano-liquid over a rotating disk in a porous medium with the various power law index, due to many remarkable applications, such as aeronautical systems, rotating machineries, air cleaning machineries, electrical power-generating systems, heat exchangers
-
Physical Mathematical Modeling and Simulation Based on Hyperbolic Heat Transfer for High Heating Rate Processes in Biomass Pyrolysis J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-09-09 Farid Chejne, Whady F. Florez, Juan C. Maya, Javier Ordonez-Loza, Manuel Garcia-Perez
This paper explores the hyperbolic heat transfer effects in processes involving high heating rates. The behavior of the model is analyzed in detail under different boundary conditions and the circumstances under which a non-Fourier law could be used to describe thermal conduction processes established from physical mathematical analysis. Finally, the model developed here is coupled to a previous population
-
Exergetic and Exergo-Economical Analyses of a Gas-Steam Combined Cycle System J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-08-31 Guven Gonca, Bulent Guzel
In this study, the results of an investigation of the performance of a gas-steam combined cycle system (GSCCS) under exergetic and exergo-economical criteria are reported. The effective power (Pef), destroyed exergy (X), efficiency of exergy (ε), unit electric generation cost (Celec) and exergy-dependent economic worth of electrical energy (Cex,elec), which is novelly determined in this study, have
-
Optimal Configuration of Finite Source Heat Engine Cycle for Maximum Output Work with Complex Heat Transfer Law J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-07-19 Jun Li, Lingen Chen
A finite source heat engine’s optimal configuration is studied. The model includes thermal resistance, heat leakage, a complex heat transfer law, and a heat source with variable temperature. The optimization objective is that the output work is the largest. The influences of factors such as the heat transfer law and heat leakage are analyzed. The results of this paper are universal and inclusive, and
-
Energy and Entropy in Open and Irreversible Chemical Reaction–Diffusion Systems with Asymptotic Stability J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-06-28 Aldo Ledesma-Durán, Iván Santamaría-Holek
This work proposes a novel approach for the study of open systems described by completely irreversible reaction mechanisms in non-homogeneous systems and subject to non-equilibrium boundary conditions. Using the non-equilibrium thermodynamics framework, we consider that in an autonomous system of reaction–diffusion equations, the thermodynamic potentials can be constructed from a Lyapunov function
-
Power Density Analysis and Multi-Objective Optimization for an Irreversible Dual Cycle J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-04-29 Yanlin Ge, Shuangshuang Shi, Lingen Chen, Difeng Zhang, Huijun Feng
Considering the various irreversibility conditions caused by heat transfer and working processes in a dual cycle, the power density performance is optimized by applying finite-time thermodynamics theory, and multi-objective optimization is performed by using NSGA-II. The effects of cut-off ratio, maximum cycle temperature ratio, and various losses by heat transfer and working processes on the relationships
-
Thermodynamical Foundations of Closed Discrete Non-Equilibrium Systems J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-04-04 Wolfgang Muschik
Some tools of Non-Equilibrium Thermodynamics of closed discrete systems are considered: the non-equilibrium state space, the non-equilibrium entropy as a state function and its connection with the entropy production, Clausius’ inequality, equilibrium and accompanying processes. Why can the thermostatic temperature be used successfully in thermal engineering even in cases of non-equilibrium?
-
Internal Variables as a Tool for Extending Navier-Stokes Equations J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-04-04 Arkadi Berezovski
The formalism of the internal variable theory is applied to extend Navier-Stokes equations. The internal variable theory provides a thermodynamically consistent derivation of constitutive relations and equations of motion without a priori specifying the nature of internal variables. Both single and dual internal variables cases are thoroughly examined. The similarities and differences of the approaches
-
Nonlinear Thermal Transport with Inertia in Thin Wires: Thermal Fronts and Steady States J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-03-31 Michele Sciacca, David Jou
In a series of papers we have obtained results for nonlinear heat transport when thin wires exchange heat non-linearly with the surroundings, with particular attention to propagating solitons. Here we obtain and discuss new results related to the propagation of nonlinear heat fronts and some conceptual aspects referring to the application of the second principle of thermodynamics to some nonlinear
-
Thermotics As an Alternative Nonequilibrium Thermodynamic Approach Suitable for Real Thermoanalytical Measurements: A Short Review J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-03-31 Jaroslav Šesták, Robert Černý
The general concept of temperature is thermodynamically defined in equilibrium somehow predictable even for non-equilibrium; however, it presents some still controversial aspects, as has been shown in a number of studies and reviews that have been published so far. Equilibrium concepts are often extrapolated to apply in micro-localized equilibrium and then appended to non-equilibrium in its entirety
-
Thermal Shear Waves Induced in Mesoscopic Liquids at Low Frequency Mechanical Deformation J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-03-31 Eni Kume, Laurence Noirez
We show that a confined viscous liquid emits a dynamic thermal response upon applying a low frequency (∼1 Hz) shear excitation. Hot and cold thermal waves are observed in situ at atmospheric pressure and room temperature, in a viscous liquid (polypropylene glycol) at various thicknesses ranging from 100 µm up to 340 µm, upon applying a mechanical oscillatory shear strain. The observed thermal effects
-
A Thermodynamical Description of Third Grade Fluid Mixtures J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-03-29 Matteo Gorgone, Patrizia Rogolino
A complete thermodynamical analysis for a non-reacting binary mixture exhibiting the features of a third grade fluid is analyzed. The constitutive functions are allowed to depend on the mass density of the mixture and the concentration of one of the constituents, together with their first and second order gradients, on the specific internal energy of the mixture with its first order gradient, and on
-
Pattern Formation in Thermal Convective Systems: Spatio-Temporal Thermal Statistics, Emergent Flux, and Local Equilibrium J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-03-23 Atanu Chatterjee, Takahiko Ban, Atsushi Onizuka, Germano Iannacchione
We discuss spatio-temporal pattern formation in two separate thermal convective systems. In the first system, hydrothermal waves (HTW) are modeled numerically in an annular channel. A temperature difference is imposed across the channel, which induces a surface tension gradient on the free surface of the fluid, leading to a surface flow towards the cold side. The flow pattern is axially symmetric along
-
Variational Approach to Fluid-Structure Interaction via GENERIC J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-10 Dirk Peschka, Andrea Zafferi, Luca Heltai, Marita Thomas
We present a framework to systematically derive variational formulations for fluid-structure interaction problems based on thermodynamical driving functionals and geometric structures in different coordinate systems by suitable transformations within this formulation. Our approach provides a promising basis to construct structure-preserving discretization strategies.
-
Optimizing the Piston Paths of Stirling Cycle Cryocoolers J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-08 Raphael Paul, Karl Heinz Hoffmann
The ideal Stirling cycle provides a clear control strategy for the piston paths of ideal representations of Stirling cycle machines. For non-equilibrium Stirling cycle machines however, piston paths aiming to emulate the ideal cycle’s four strokes will not necessarily yield best performance. In this contribution, we ask the question: What are the COP-optimal piston paths for specific non-equilibrium
-
Effect of Cross-Sectional Geometry on Hydrothermal Behavior of Microchannel Heat Sink J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-08 Faraz Ahmad, Fawad Ahmed, Husan Ali, Zabdur Rehman, Muhammad Suleman, Izaz Raouf
The aim of this paper is to numerically analyze the hydrothermal behavior of different cross-sectional geometries of microchannel heat sinks (MCHSs) and conduct a comparative analysis of traditional and non-traditional designs using ANSYS Fluent. It is expected that the proposed design discussed in this paper will improve the performance of MCHSs by maximizing the cooling capability and minimizing
-
Sources of Finite Speed Temperature Propagation J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-08 Paolo Maria Mariano, Marco Spadini
The relation between heat flux and temperature gradient has been considered as a constitutive structure or as a balance law in different approaches. Both views may allow a description of heat conduction characterized by finite speed propagation of temperature disturbances. Such a result, which overcomes Fourier’s drawback of infinite speed propagation, can be obtained also by considering insufficient
-
Non-Linear Stability and Non-Equilibrium Thermodynamics—There and Back Again J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-07 Mark Dostalík, Vít Průša
We discuss the role of thermodynamics in non-linear stability analysis of spatially distributed dissipative systems governed by non-linear partial differential equations. We document profound interplay between various concepts in thermodynamics on one side and non-linear stability analysis on the other side, and subsequently we summarize and comment on various results regarding the non-linear stability
-
A Robust Physics-Based Calculation of Evolving Gas–Liquid Interfaces J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-04 Lukáš Šatura, Mária Minichová, Michal Pavelka, Juraj Kosek, Alexandr Zubov
Density gradient theory describes the evolution of diffuse interfaces in both mixtures and pure substances by minimization of the total free energy, which consists of a non-convex bulk part and an interfacial part. Minimization of the bulk free energy causes phase separation while building up the interfacial free energy (proportional to the square of gradients of the species’ densities) and it results
-
Non-Linear Heat Transport Effects in Systems with Defects J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-02-02 David Jou, Liliana Restuccia
In this paper we explore several aspects of the influence of fixed and of mobile defects on the thermal conductivity of materials. In particular, we investigate the effects of the temperature and defect concentration dependence of the conductivity on phononic diodes and transistors and on the non-linear thermal conductivity dependent on the heat flux in thermal superlattices.
-
Frontmatter J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01
Article Frontmatter was published on January 1, 2022 in the journal Journal of Non-Equilibrium Thermodynamics (volume 47, issue 1).
-
Theoretical Analysis of Activation Energy Effect on Prandtl–Eyring Nanoliquid Flow Subject to Melting Condition J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Ikram Ullah, Rashid Ali, Hamid Nawab, Abdussatar, Iftikhar Uddin, Taseer Muhammad, Ilyas Khan, Kottakkaran Sooppy Nisar
This study models the convective flow of Prandtl–Eyring nanomaterials driven by a stretched surface. The model incorporates the significant aspects of activation energy, Joule heating and chemical reaction. The thermal impulses of particles with melting condition is addressed. The system of equations is an ordinary differential equation (ODE) system and is tackled numerically by utilizing the Lobatto
-
Internal Structure and Heat Conduction in Rigid Solids: A Two-Temperature Approach J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Ruth Estephania Gonzalez-Narvaez, Mariano López de Haro, Federico Vázquez
A non-Fourier thermal transport regime characterizes the heat conduction in solids with internal structure. Several thermodynamic theories attempt to explain the separation from the Fourier regime in such kind of systems. Here we develop a two-temperature model to describe the non-Fourier regime from the principles of non-equilibrium thermodynamics. The basic assumption is the existence of two well-separated
-
A Case Study of Non-Fourier Heat Conduction Using Internal Variables and GENERIC J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Mátyás Szücs, Michal Pavelka, Róbert Kovács, Tamás Fülöp, Péter Ván, Miroslav Grmela
Applying simultaneously the methodology of non-equilibrium thermodynamics with internal variables (NET-IV) and the framework of General Equation for the Non-Equilibrium Reversible–Irreversible Coupling (GENERIC), we demonstrate that, in heat conduction theories, entropy current multipliers can be interpreted as relaxed state variables. Fourier’s law and its various extensions—the Maxwell–Cattaneo–Vernotte
-
Significance of Entropy Generation and the Coriolis Force on the Three-Dimensional Non-Darcy Flow of Ethylene-Glycol Conveying Carbon Nanotubes (SWCNTs and MWCNTs) J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Ikram Ullah, Tasawar Hayat, Arsalan Aziz, Ahmed Alsaedi
Nanofluids based on CNTs/ethylene glycol have a potential role in contributing to industrial applications like heat exchangers, domestic refrigerator, electronics cooling, etc. The aim and novelty of the present research is to communicate the significance of the Coriolis force and Darcy-Forchheimer stretched flow of ethylene glycol (EG) conveying carbon nanotubes (CNTs) in a rotating frame. Furthermore
-
Maximum Work Rate Extractable from Energy Fluxes J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Viorel Badescu
A general formalism is developed to evaluate the amount of work extractable from energy fluxes. It covers nonequilibrium cases when the concept of exergy is not relevant. The rate of work deficiency, which has been previously introduced as the total loss of exergy, is defined here as the total loss of work, which would have resulted if all the work were lost to the environment. New performance indicators
-
Spectral Properties of Dissipation J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Peter Ván, Róbert Kovács, Federico Vázquez
The novel concept of spectral diffusivity is introduced to analyze the dissipative properties of continua. The dissipative components of a linear system of evolution equations are separated into noninteracting parts. This separation is similar to mode analysis in wave propagation. The new modal quantities characterize dissipation and are best interpreted as effective diffusivities, or, in case of the
-
Over-Equilibrium as a Result of Conservatively-Perturbed Equilibrium (Acyclic and Cyclic Mechanisms) J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Vitaliy R. Trishch, Yuriy O. Beznosyk, Denis Constales, Gregory S. Yablonsky
The effect of over-equilibrium, i. e., the effect at which the concentration of some substance is higher than the corresponding equilibrium value, is demonstrated for two types of ideal chemical reactors, continuously stirred tank reactor (CSTR) and plug-flow reactor (PFR), respectively, under conditions of conservatively perturbed-equilibrium (CPE). Two types of complex chemical mechanisms are analyzed
-
Transient, Sub-Continuum, Heat Conduction in Irregular Geometries J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2022-01-01 Saad Bin Mansoor, Bekir S. Yilbas
Phonon transfer in irregular shapes is important for assessing the influence of shape effect on thermal transport characteristics of low-scale films. It becomes critical for evaluating the contribution of the scattering phonons to the phonon intensity distribution inside the film. Hence, the sub-continuum ballistic-diffusive model is incorporated to formulate the phonon transport in an irregular geometry
-
The Role of Internal Irreversibilities in the Performance and Stability of Power Plant Models Working at Maximum ϵ-Ecological Function J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2021-07-20 Gabriel Valencia-Ortega, Sergio Levario-Medina, Marco Antonio Barranco-Jiménez
The proposal of models that account for the irreversibilities within the core engine has been the topic of interest to quantify the useful energy available during its conversion. In this work, we analyze the energetic optimization and stability (local and global) of three power plants, nuclear, combined-cycle, and simple-cycle ones, by means of the Curzon–Ahlborn heat engine model which considers a
-
Size Effects and Beyond-Fourier Heat Conduction in Room-Temperature Experiments J. Non Equilib. Thermodyn. (IF 4.29) Pub Date : 2021-07-16 Anna Fehér, Norbert Lukács, László Somlai, Tamás Fodor, Mátyás Szücs, Tamás Fülöp, Peter Ván, Róbert Kovács
It is a long-lasting task to understand heat conduction phenomena beyond Fourier. Besides the low-temperature experiments on extremely pure crystals, it has turned out recently that heterogeneous materials with macro-scale size can also show thermal effects that cannot be modeled by the Fourier equation. This is called over-diffusive propagation, different from low-temperature observations, and is