Journal of Non-Equilibrium Thermodynamics最新文献

Numerical and optimization analysis of natural convection and entropy-generation in wavy triangular cavity with Casson fluid under magnetohydrodynamics and radiation 磁流体力学和辐射作用下卡森流体在波浪三角形空腔内自然对流和熵生成的数值与优化分析

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-06-25 DOI: 10.1515/jnet-2024-0101

Yasir Ul Umair Bin Turabi, Zeshan Faiz, Shahzad Munir, Shafee Ahmad, M.M. Alam, Hakim AL Garalleh

{"title":"Numerical and optimization analysis of natural convection and entropy-generation in wavy triangular cavity with Casson fluid under magnetohydrodynamics and radiation","authors":"Yasir Ul Umair Bin Turabi, Zeshan Faiz, Shahzad Munir, Shafee Ahmad, M.M. Alam, Hakim AL Garalleh","doi":"10.1515/jnet-2024-0101","DOIUrl":"https://doi.org/10.1515/jnet-2024-0101","url":null,"abstract":"Enclosure design is essential for thermal engineering technology and applications, including electronics, heat transfer equipment, power reactors, cooling mechanisms, solar energy systems, and nuclear power plants. This study aims to analyze the numerical and Response Surface Methodology (RSM) optimization for natural convection and entropy generation in a wavy triangular cavity with Casson fluid under inclined magnetohydrodynamic and radiation influences. The finite element approach (FEM) is utilized to compute the numerical solution for the simulation framework, while RSM is applied to determine the optimal heat transfer rate among four different parameters. The study presents streamlines, velocity profiles, isothermal lines, total entropy generation, and average Nusselt number in graphically and tabularly. The results show that an increase in the number of undulations and the Casson parameter leads to an increase in the thermal transfer rate and total entropy generation, whereas the Hartmann number has a decreasing effect on both. The Nusselt number rises with the rising number of undulations and the radiation parameter. The peak stream function is observed at an inclination angle of 60°. The significant R 2 value of 0.9967 shows a good agreement between the expected and actual values.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"26 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144488465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite element analysis on generalized piezothermoelastic interactions in an unbounded piezoelectric medium containing a spherical cavity 含球腔的无界压电介质中广义压热弹性相互作用的有限元分析

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-05-30 DOI: 10.1515/jnet-2025-0034

Ibrahim Abbas, Areej Almuneef, Zuhur Alqahtani

引用次数: 0

Thermal transport in a silicon/diamond micro-flake with quantum dots inserts 嵌入量子点的硅/金刚石微片的热输运

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-05-22 DOI: 10.1515/jnet-2025-0025

Saad Bin Mansoor, Bekir Sami Yilbas

{"title":"Thermal transport in a silicon/diamond micro-flake with quantum dots inserts","authors":"Saad Bin Mansoor, Bekir Sami Yilbas","doi":"10.1515/jnet-2025-0025","DOIUrl":"https://doi.org/10.1515/jnet-2025-0025","url":null,"abstract":"Non-equilibrium thermal energy transfer in small scale films pairs, composing of different film materials, is important for designing semiconductor devices or thermoelectric energy generators. The present study examines thermal energy transfer in low size silicon-diamond film pairs with the quantum dots in placed. Equation for Phonon Radiative Transport (EPRT) is used to predict the distribution of phonon intensities via adopting the discrete ordinate method. Thermal energy transport is quantified in the form phonon energies via using integral form of equilibrium phonon intensities. Because of the mismatch of properties between silicon and diamond films, interface conditions are formulated after considering energy balance across both films. Findings reveal that equivalent equilibrium temperature decays gradually in the film for small size quantum dots. As the quantum dot size increases, equivalent equilibrium temperature decays sharply because films edges behave like heat sink reducing equilibrium phonon intensities in the region of film edges. Temperature jump, due to mismatch properties of the films, signifies at the mid-section of the interface and it increases slightly with increasing quantum dot size. The magnitude of heat flux vector remains higher in diamond than silicon film. The effective thermal conductivity predicted is in agreement with the previous data for silicon film.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"80 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144122396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Approaches of finite-time thermodynamics in conceptual design of heat exchange systems 换热系统概念设计中的有限时间热力学方法

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-04-22 DOI: 10.1515/jnet-2024-0118

Ivan Sukin, Alexandr Mazikov, Anatoly Tsirlin, Ruben Gevorkyan

{"title":"Approaches of finite-time thermodynamics in conceptual design of heat exchange systems","authors":"Ivan Sukin, Alexandr Mazikov, Anatoly Tsirlin, Ruben Gevorkyan","doi":"10.1515/jnet-2024-0118","DOIUrl":"https://doi.org/10.1515/jnet-2024-0118","url":null,"abstract":"Authors give a review of the methods of finite-time thermodynamics in problems of obtaining the limiting capabilities of two- and multi-flow heat exchange systems. The boundaries of their physical reachability are constructed. The case of flows with changing heat capacity and, in particular, flows with a change in phase state is considered. The conditions for minimum heat exchange dissipation are obtained for different kinetics at fixed heat transfer coefficient and heat load. The concept of thermodynamically equivalent heat exchange systems is introduced and a method for transition from a multi-flow system to an equivalent two-flow heat exchanger in which heat capacities of the flows depend on temperature is proposed. Based on the obtained results, an algorithm for synthesis of multi-flow heat exchange systems is proposed. The synthesis takes into account the limitations on the temperatures of all or part of the flows. The synthesis of the system involves the calculation and minimization of the number of two-flow heat exchangers and the selection of the contact structure, the values of flow parameters, the distribution of contact surfaces and heat loads between two-flow heat exchange cells. In the design procedure the limitations on the temperatures of all or part of the flows are taken into account. Using thermodynamic criteria instead of technical and economic ones allows us to radically simplify the problem of designin the system.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"127 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A general relativistic kinetic theory approach to linear transport in generic hydrodynamic frame 一般流体动力系中线性输运的广义相对论动力学方法

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-04-09 DOI: 10.1515/jnet-2024-0024

Long Cui, Xin Hao, Liu Zhao

引用次数: 0

Optimization of injection parameters, and ethanol shares for cottonseed biodiesel fuel in diesel engine utilizing artificial neural network (ANN) and taguchi grey relation analysis (GRA) 基于人工神经网络（ANN）和田口灰关联分析（GRA）的棉籽生物柴油柴油喷射参数及乙醇份额优化

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-03-13 DOI: 10.1515/jnet-2024-0095

G. Praveen Kumar Yadav, Pullarao Muvvala, R. Meenakshi Reddy

{"title":"Optimization of injection parameters, and ethanol shares for cottonseed biodiesel fuel in diesel engine utilizing artificial neural network (ANN) and taguchi grey relation analysis (GRA)","authors":"G. Praveen Kumar Yadav, Pullarao Muvvala, R. Meenakshi Reddy","doi":"10.1515/jnet-2024-0095","DOIUrl":"https://doi.org/10.1515/jnet-2024-0095","url":null,"abstract":"The increase of fossil fuel powered industrial processes and vehicles has resulted in the exhaustion of petroleum reserves and pollution of the environment. Because of its clean-burning, renewable, and biodegradable qualities, biodiesel is becoming more and more recognized as a potential diesel fuel alternative. The present study investigates engine performance and emission characteristics of cottonseed oil (CSBD20) and diesel blends tested on single-cylinder compression ignition engine by several injection timings, injection pressures, and ethanol shares. Performance parameters such as brake thermal efficiency (BTE), brake-specific fuel consumption (BSFC), exhaust emissions such as hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NO x ), carbon dioxide (CO2), and smoke were considered as output factors, considering injection timing (IT), ethanol share (ES), injection pressure (IP) as input factors utilizing artificial neural network (ANN) and taguchi grey relation analysis (GRA). The ANN model accurately predicts the input-output relationships of ethanol and cottonseed biodiesel blends, as validated by experimental comparisons. The predicted values for BTE, BSFC, HC, CO, NO x , and smoke show close alignment with experimental results, with marginal errors of 6.2 %, 2.8 %, 7.1 %, 4.7 %, 6.8 %, and 5.6 %, respectively, confirming its reliability. In addition, this study utilized Taguchi grey relational analysis (GRA) to find optimum engine operating conditions. The analysis revealed that the optimal engine operating conditions were IT at 27° CA bTDC, ES at 15 %, and IP at 200 bar. Furthermore, confirmation tests are also conducted at optimum operating conditions, and the revealed values are closer to taguchi GRA experiments and ANN predicted values.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"183 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of depositional nanoparticles on heat transfer at the solid–liquid interface using molecular dynamics simulations 应用分子动力学模拟沉积纳米颗粒对固液界面传热的影响

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-03-12 DOI: 10.1515/jnet-2024-0080

Xunyan Yin, Congzheng Li, Zhihai Kou, Ran Zhang, Hailun Zhou

{"title":"Effect of depositional nanoparticles on heat transfer at the solid–liquid interface using molecular dynamics simulations","authors":"Xunyan Yin, Congzheng Li, Zhihai Kou, Ran Zhang, Hailun Zhou","doi":"10.1515/jnet-2024-0080","DOIUrl":"https://doi.org/10.1515/jnet-2024-0080","url":null,"abstract":"Here, we investigate the effect of depositional nanoparticles (DNPs) on boiling heat transfer using molecular dynamics simulations. We discuss the type and density of DNPs and reveal their physical mechanism on boiling heat transfer. In the case of nanoparticle material changes, the onset time of explosive boiling, the heat flux, and the enhancement factor of the DNPs are calculated, and the results show that the heat transfer at the solid–liquid interface is enhanced due to the DNPs. The enhancement of Cu-DNP is the largest, followed by Ag- and Au-DNP. Compared with a smooth surface, the interfacial interaction of the DNP surface is increased, resulting in the improvement of the surface wettability, which is beneficial to heat transfer. Furthermore, the interfacial thermal resistance affects the heat transfer when the DNP material changes. The DNPs enhance the vibrational thermal matching of atoms at the solid–liquid interface, leading to heat traveling more easily across the interface, and thus the heat transfer between surface and fluid is enhanced. In the case of nanoparticle density changes, the results demonstrate that the boiling heat transfer is enhanced by an increase in DNP density, which confirms that the interfacial interaction and the thermal resistance have significant effects on the heat transfer at the solid–liquid interface.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"17 2 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exergy-based efficient ecological-function optimization for endoreversible Carnot refrigerators 内可逆卡诺冰箱基于火用的高效生态功能优化

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-03-12 DOI: 10.1515/jnet-2024-0099

Yanju He, Yanlin Ge, Lingen Chen, Huijun Feng

{"title":"Exergy-based efficient ecological-function optimization for endoreversible Carnot refrigerators","authors":"Yanju He, Yanlin Ge, Lingen Chen, Huijun Feng","doi":"10.1515/jnet-2024-0099","DOIUrl":"https://doi.org/10.1515/jnet-2024-0099","url":null,"abstract":"Based on the definition of exergy-based efficient ecological-function (EEF) proposed in the existing literature, which is the product of energy conversion coefficient-of-performance (ɛ) and exergy-based ecological-function (E), this paper will introduce the exergy-based EEF into performance optimization for Carnot refrigerator cycle. Via endoreversible Carnot refrigerator model established in previous literature, expression of the exergy-based EEF of refrigerator is derived based on finite-time thermodynamic theory, relationships of dimensionless exergy-based EEF versus ɛ and cooling load (R) are studied, and performance differences of refrigerator cycles at the maximum exergy-based EEF, at the maximum E, and at the maximum efficient cooling-load conditions are compared. The results demonstrate that relationships of dimensionless exergy-based EEF versus R and ɛ are parabolic-like ones; in actual design, the refrigerator should be designed at the larger R and ɛ points. When exergy-based EEF is taken as optimization-objective, although R decreases slightly, ɛ is increased, and entropy-generation-rate (σ) is greatly decreased, so exergy-based EEF does not only reflect the compromise between the R and σ, but also reflect the compromise between the R and ɛ.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"21 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energetic analysis of a non-isothermal linear energy converter operated in reverse mode (I-LEC): heat pump 反向模式下非等温线性能量转换器（I-LEC）的能量分析：热泵

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-03-06 DOI: 10.1515/jnet-2024-0065

Saul Gonzalez-Hernandez

{"title":"Energetic analysis of a non-isothermal linear energy converter operated in reverse mode (I-LEC): heat pump","authors":"Saul Gonzalez-Hernandez","doi":"10.1515/jnet-2024-0065","DOIUrl":"https://doi.org/10.1515/jnet-2024-0065","url":null,"abstract":"In this paper, we perform an energetic analysis of a non-isothermal linear energy converter operated in inverse mode (refrigerator and heat pump). This is done within the framework of linear irreversible thermodynamics (LIT), starting from the model of an inverse linear energy converter (I-LEC) proposed by S. Gonzalez et al. (S. Gonzalez-Hernandez and L.-A. Arias-Hernandez, “Thermoelectric thomson relations revisited for a linear energy converter,” J. Non-Equilibrium Thermodyn., vol. 44, no. 3, pp. 315–332, 2019). We extend this model to the case of heat pumps, considering different objective functions and performing their respective analyses. We particularly focus on the coefficient of performance (COP) of heating, ϵ H . Additionally, we propose other energetic functions that may be of interest in the analysis of heat pumps, drawing analogies with the well-known functions for refrigerators and heat engines. Finally, we present a brief description of thermoelectric phenomena, focusing primarily on the Peltier effect. A brief analysis of the results obtained in the context of thermoelectric cooling and heating is presented for a non-isothermal LEC.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"212 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat transfer at nano-scale and boundary conditions: a comparison between the Guyer-Krumhansl model and the Thermomass theory 纳米尺度和边界条件下的传热：Guyer-Krumhansl模型与热质理论的比较

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2025-03-06 DOI: 10.1515/jnet-2024-0098

Carmelo F. Munafó, Patrizia Rogolino, Antonio Sellitto

引用次数: 0