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Performance analysis of quantum harmonic Otto engine and refrigerator under a trade-off figure of merit J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-08-28 Kirandeep Kaur, Shishram Rebari, Varinder Singh
We investigate the optimal performance of the quantum Otto engine and refrigeration cycles of a time-dependent harmonic oscillator under a trade-off figure of merit for both adiabatic and nonadiabatic (sudden-switch) frequency modulations. For heat engines (refrigerators), the chosen trade-off figure of merit is an objective function defined by the product of efficiency (coefficient of performance)
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Investigation of the operating characteristics of diesel engines with chromium oxide (Cr2O3) nanoparticles dispersed in Mesua ferrea biodiesel: an experimental and predictive approach using ANNs and RSM J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-08-16 Jagadish Kari, Vanthala Varaha Siva Prasad, Jaikumar Sagari
This study investigates the effects of using biodiesel from Mesua ferrea (BD20) and chromium oxide (Cr2O3) nanoparticles in diesel engines. The Response Surface Methodology (RSM) model and artificial neural networks (ANNs) were developed to make precise predictions of the operating parameters. The amount of Cr2O3 nanoparticles was set at 80 mg/L, and surfactant and dispersant were applied to the nanoparticles
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Analytical solutions for nonequilibrium bioheat transfer in tumor during magnetic nanoparticles hyperthermia J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-07-23 Zuhur Alqahtani, Ibrahim Abbas
This paper presents mathematical responses for the dual-phase-lag (DPL) hypothesis, which accounts for nonequilibrium heat transfer during magnetic nanoparticle hyperthermia in tumor. To get this precision, volume averaging is used for the local instantaneous energy formulation for tissues and blood. This study proposes a hybrid numerical strategy to solve this problem by combining change of variables
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Composite liquids under high-power heating: superheat of water in micro-explosion of water-in-fuel droplets J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-07-23 Alexey Melkikh, Pavel Skripov
The article analyses the degree of water superheating with respect to the liquid-vapour equilibrium line in experiments on the micro-explosion of a composite droplet comprised of two immiscible liquids. The analyses were carried out for water-in-fuel drops under conditions of high-power heating. This degree is compared with the mechanical effect of droplet decay, involving the formation of daughter
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Application of a three-laser optical digital interferometry in a thermogravitational analysis for binary and ternary mixtures J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-07-16 Ane Errarte, Antton Sanjuan, Aliaksandr Mialdun, Marcos Alonso, Imanol Andonegui, Valentina Shevtsova, M. Mounir Bou-Ali
We discuss the application of the three-laser optical digital interferometry method for the determination of transport properties such as the thermodiffusion, the molecular diffusion and the Soret coefficients by the thermogravitational column technique. The primary objective of this study is to illustrate the capabilities and limitations of the method for quantifying these properties in both binary
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Mass transfer at vapor-liquid interfaces of H2O + CO2 mixtures studied by molecular dynamics simulation J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-07-16 Simon Stephan, Vilde Bråten, Hans Hasse
In many industrial applications as well as in nature, the mass transfer of CO2 at vapor-liquid interfaces in aqueous systems plays an important role. In this work, this process was studied on the atomistic level using non-equilibrium molecular dynamics simulations. In a first step, a molecular model of the system water + CO2 was developed that represents both bulk and interfacial equilibrium properties
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Kinetic and thermodynamic approach to precisely solve the unsteady Rayleigh flow problem of a rarefied homogeneous charged gas under external force influence J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-07-01 Taha Zakaraia Abdel Wahid, Zaki Mrzog Alaofi
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
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Generalized energy-conserving dissipative particle dynamics with mass transfer: coupling between energy and mass exchange J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-05-30 Giuseppe Colella, Allan D. Mackie, James P. Larentzos, John K. Brennan, Martin Lísal, Josep Bonet Avalos
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
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Power and efficient power optimization of one-qubit Novikov quantum heat engines with an external dissipative heat leak J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-05-29 Julio Juan Fernández
We optimize one-qubit Novikov quantum heat engines with a dissipative heat leak using the formalisms of open-system Quantum Mechanics and the Finite-Time Thermodynamics. We show that the leak changes the power-efficiency and the efficient-power-efficiency curves, reduces the maximum efficiency of the machine and does not change its power. We also discuss the effects of the leak on the power that is
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Thermodiffusion, diffusion and Soret coefficients of binary polymeric mixtures in toluene and cyclohexane J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-05-24 Antton Sanjuan, Daniel Sommermann, Werner Köhler, Valentina Shevtsova, M. Mounir Bou-Ali
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)
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Inconsistency between the micropolar theory and non-equilibrium thermodynamics in the case of polar fluids J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-04-30 Pavlos S. Stephanou
The balance equation of angular momentum in anisotropic fluids includes a couple stress contribution, also responsible for an antisymmetric contribution to the force stress tensor. We herein derive all balance equations for the simplest anisotropic fluid, i.e., a polar fluid, using the GENERIC formalism of non-equilibrium thermodynamics. In doing so, we find that there is an inconsistency between the
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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 J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-04-24 Roman Reh, Mareike Hager, Werner Köhler
We have developed a new double-pass optical beam deflection instrument for the measurement of diffusion, thermodiffusion and Soret coefficients in liquid mixtures. The increased sensitivity of the instrument results from a second passage of the readout laser beam through the Soret cell containing the sample. An elegant description of the total beam deflection is achieved by means of a transfer matrix
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Lack-of-fit reduction in non-equilibrium thermodynamics applied to the Kac–Zwanzig model J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-04-08 Kateřina Mladá, Martin Šípka, Michal Pavelka
Even when microscopic particle dynamics is purely mechanistic and thus reversible, the behavior of macroscopic systems composed of those particles is irreversible. In other words, effectively irreversible behavior emerges out of purely reversible dynamics when we do not observe all degrees of freedom of the detailed dynamics. But how can we find the irreversible macroscopic evolution equations when
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Variations on the models of Carnot irreversible thermomechanical engine J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-04-08 Michel Feidt, Monica Costea
The JETC Conference held in Salerno (June 12–17, 2023) was the opportunity to honor the two centuries anniversary of the booklet publication of Sadi Carnot. The paper reports on a selective review summarizing the evolution of the ideas and concepts proposed by Carnot. We consider mainly: a. The Carnot cycle relative to thermomechanical engine, b. The concept of efficiency (Carnot efficiency), c. The
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Proposing a procedure for multi-objective optimization of cascade thermoelectric coolers to achieve maximum cooling capacity and COP J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-03-22 Amin Hadidi
A novel approach is proposed for optimal designing two-stage thermoelectric coolers using the biogeography-based optimization algorithm. For the comprehensiveness of the research, both types of two-stage coolers, including electrically serial and separated stages, have been investigated. Using the proposed procedure, first by selecting the most important performance parameters of the cooler, i.e. COP
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Poroacoustic front propagation under the linearized Eringen–Cattaneo–Christov–Straughan model J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-03-19 Vittorio Zampoli, Pedro M. Jordan
Employing the Laplace transform and its properties, we investigate the evolution of the coupled thermal and fluid-acoustic waveforms that arise in a signaling problem under the Eringen–Cattaneo–Christov–Straughan model of poroacoustic phenomena. Assuming a Heaviside temperature input, we determine the effects of what we term the “Eringen coefficient” by examining the propagation and evolution of the
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The wall effect in a plane counterflow channel J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-03-19 Luca Galantucci, Michele Sciacca
In this paper, we study the influence of the boundary conditions of the velocity fields in superfluid helium counterflow experiments. To make progress, we perform numerical simulations where we allow a slip velocity of the viscous component at the walls, and observe how this impacts on velocity fields and density profiles of distribution of quantized vortices. We conclude that the presence of a slip
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Corrigendum to: Significance of entropy generation and the Coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs) J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-03-12 Ikram Ullah, Tasawar Hayat, Arsalan Aziz, Ahmed Alsaedi
This corrigendum addresses some typographical mistakes and errors in published article “Significance of entropy generation and the Coriolis force on the three-dimensional non-Darcy flow of ethylene-glycol conveying carbon nanotubes (SWCNTs and MWCNTs)”. Corrections about some typographical errors and plots of g η $g\left(\eta \right)$ satisfying ambient condition in study (I. Ullah, T. Hayat, A. Aziz
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On the dynamic thermal conductivity and diffusivity observed in heat pulse experiments J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-03-11 Anna Fehér, Róbert Kovács
Determining the thermal properties of materials with complex structures is still a major engineering challenge today. The well-known heat pulse experiment can be used to determine the thermal diffusivity by measuring the temperature history as a thermal response for a fast excitation. However, the evaluation of the measurements can be challenging, especially when dealing with non-homogeneous samples
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Optimization analysis of an endoreversible quantum heat engine with efficient power function J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-02-14 Kirandeep Kaur, Anmol Jain, Love Sahajbir Singh, Rakesh Singla, Shishram Rebari
We study the optimal performance of an endoreversible quantum dot heat engine, in which the heat transfer between the system and baths is mediated by qubits, operating under the conditions of a trade-off objective function known as the maximum efficient power function defined by the product of power and efficiency of the engine. First, we numerically study the optimization of the efficient power function
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Modeling equilibrium and non-equilibrium thermophysical properties of liquid lubricants using semi-empirical approaches and neural network J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-02-08 Sayed Mostafa Hosseini, Taleb Zarei, Mariano Pierantozzi
This study explored the capability of semi-empirical and neural network approaches for correlating and predicting some equilibrium and non-equilibrium 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 hard-chain equation of state (PHC EoS)
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Hydrodynamic, electronic and optic analogies with heat transport in extended thermodynamics J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-26 Vito Antonio Cimmelli, David Jou, Antonio Sellitto
Over the last twenty-five 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 non-equilibrium thermodynamics, due to the growing interest in nanotechnologies, thermal metamaterials and fast devices. Here we review how some mathematical analogies between generalized heat-transport
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Thermodynamic costs of temperature stabilization in logically irreversible computation J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-26 Shu-Nan Li, Bing-Yang Cao
In 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 non-Fourier heat transport with nonlocal effects,
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Optimized quantum drift diffusion model for a resonant tunneling diode J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-23 Orazio Muscato, Giovanni Nastasi, Vittorio Romano, Giorgia Vitanza
The 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 drift-diffusion model of semiconductors,” J. Math. Phys., vol. 48, p. 023501, 2007; A. El Ayyadi and A. Jüngel, “Semiconductor simulations using a coupled quantum drift-diffusion schrödinger-Poisson model,” SIAM J. Appl. Math., vol. 66, no. 2,
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Thermodynamics of micro- and nano-scale flow and heat transfer: a mini-review J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-22 Yangyu Guo, Moran Wang
The modeling and understanding of micro- and nano-scale transport processes have raised increasing attention and extensive investigation during the past decades. In this mini-review, we aim to summarize our recent progress on the non-equilibrium thermodynamics of micro- and nano-scale flow and heat transfer. Special emphasis is put on the entropy generation at the interface, which plays a dominant
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Revisit nonequilibrium thermodynamics based on thermomass theory and its applications in nanosystems J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-22 Renjie Hua, Yuan Dong
The development of non-Fourier 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 non-Fourier heat conduction models. To resolve this paradox, extended irreversible thermodynamics (EIT) introduces a new
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Heat transfer within nonequilibrium dense aluminum heated by a heavy ion beam J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-22 Chiwan Song, Seongmin Lee, Woosuk Bang
Energetic laser-accelerated ions can heat a small solid-density 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
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Thermal and electrical properties of photovoltaic cell with linear phenomenological heat transfer law J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-05 Jun Li, Lingen Chen
The 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 volt-ampere 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
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Strategies to improve the thermal performance of solar collectors J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2024-01-05 Bader Alshuraiaan
The 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
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On the influence of the fourth order orientation tensor on the dynamics of the second order one J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-12-16 Christina Papenfuss
The 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
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Onsager-Casimir reciprocal relations as a consequence of the equivalence between irreversibility and dissipation J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-12-14 Václav Klika, Sylvain D. Bréchet
The 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
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Buoyancy driven convection with a Cattaneo flux model J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-12-14 Brian Straughan, Vincenzo Tibullo, Francesca Passarella
We 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
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Relativistic hydrodynamics from the single-generator bracket formalism of nonequilibrium thermodynamics J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-12-05 Vlasis G. Mavrantzas
We employ the generalized bracket formalism of nonequilibrium thermodynamics by Beris and Edwards to derive Lorentz-covariant time-evolution 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
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Multi-objective optimization of an endoreversible closed Atkinson cycle J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-11-24 Zheng Gong, Yanlin Ge, Lingen Chen, Huijun Feng
Based on finite-time-thermodynamic theory and the model established in previous literature, the multi-objective optimization analysis for an endoreversible closed Atkinson cycle is conducted through using the NSGA-II 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
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The effects of fractional time derivatives in bioheat conduction technique on tumor thermal therapy J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-11-17 Ibrahim Abbas, Aatef Hobiny, Alaa El-Bary
The 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
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Strategies to improve the thermal performance of solar collectors J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-10-25 Bader Alshuraiaan
The 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
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Multidimensional numerical simulation of thermodynamic and oscillating gas flow processes of a Gifford-McMahon cryocooler J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-10-21 Debashis Panda, Ashok Kumar Satapathy, Sunil Kr. Sarangi, Upendra Behera
The Gifford-McMahon cryocoolers are considered to be prominent candidates for the cooling of high-temperature superconducting magnets, liquefaction of permanent gases, helium recondensation in magnetic resonance imaging machines, cooling of superconducting quantum interference device, etc. In this paper, multi-dimensional numerical simulation is performed to visualize the oscillating heat and fluid
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Heat transfer effect on the performance of three-heat-reservoir thermal Brownian refrigerator J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-10-07 Congzheng Qi, Lingen Chen, Yanlin Ge, Huijun Feng
A finite-time thermodynamic (FTT) model of three-heat-reservoir 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 non-equilibrium thermodynamics (NET). The
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Improved modeling of Janus membrane considering the influence of hydrophilic layer characteristics J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-09-16 Noha M. Sayed, H. Noby, Kyaw Thu, A. H. El-Shazly
Some 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
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Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-09-07 Di Wu, Yanlin Ge, Lingen Chen, Lei Tian
Based on the irreversible Otto cycle model, applying finite-time-thermodynamic theory, this paper takes power and efficiency as the objective functions, further studies the cycle performance under the condition of non-ideal 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
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Computational radiative transport in complex geometries using orthogonal coordinates J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-09-04 Md Ershadul Haque, Saad Bin Mansoor, Bekir Sami Yilbas
Radiative 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
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Investigation of non-equilibrium separation time on the partitioning of cephalexin in an aqueous two-phase system composed of glucose and acetonitrile J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-07-15 Parsa Movahedi, Ali Jalali Qush Qayeh, Javad Rahbar Shahrouzi
In order to commercialize aqueous two-phase 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
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Uncovering enzymatic structural adaptations from energy dissipation J. Non Equilib. Thermodyn. (IF 4.3) Pub Date : 2023-07-07 Andrés Arango-Restrepo, Daniel Barragán, J. Miguel Rubi
While genetic mutations, natural selection and environmental pressures are well-known 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
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Relations between timescales of stochastic thermodynamic observables J. Non Equilib. Thermodyn. (IF 4.3) 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
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Concepts of phenomenological irreversible quantum thermodynamics II: time dependent statistical ensembles of bipartite systems J. Non Equilib. Thermodyn. (IF 4.3) 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
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Thermodynamic analysis of the effect of rotation on gas adsorption J. Non Equilib. Thermodyn. (IF 4.3) 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
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Oblique shock wave in turbulent flow J. Non Equilib. Thermodyn. (IF 4.3) 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
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The entropy production paradox for fractional diffusion J. Non Equilib. Thermodyn. (IF 4.3) 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
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Multiscale theory J. Non Equilib. Thermodyn. (IF 4.3) 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.
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Generalized Onsager fluxes based on inexact differential 1-form J. Non Equilib. Thermodyn. (IF 4.3) 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
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On small local equilibrium systems J. Non Equilib. Thermodyn. (IF 4.3) 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
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A practical upper-bound efficiency model for solar power plants J. Non Equilib. Thermodyn. (IF 4.3) 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
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Energy production in one-qubit quantum Agrawal machines J. Non Equilib. Thermodyn. (IF 4.3) 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
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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 4.3) 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
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A simplified analysis of the Feynman pallet and ratchet mechanism considering different forms of generated power J. Non Equilib. Thermodyn. (IF 4.3) 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
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Conservatively perturbed equilibrium in multi-route catalytic reactions J. Non Equilib. Thermodyn. (IF 4.3) 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
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Natural convection of a viscoelastic Cattaneo–Christov fluid bounded by thick walls with finite thermal conductivity J. Non Equilib. Thermodyn. (IF 4.3) 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
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The Onsager–Machlup theory of fluctuations and time-dependent generalized normal distribution J. Non Equilib. Thermodyn. (IF 4.3) 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
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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 4.3) 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,
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New formulation of the Navier–Stokes equations for liquid flows J. Non Equilib. Thermodyn. (IF 4.3) 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