Journal of Non-Equilibrium Thermodynamics最新文献_第3页

Thermodynamics and dynamic stability: extended theories of heat conduction 热力学和动态稳定性：热传导的扩展理论

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-09-24 DOI: 10.1515/jnet-2024-0041

Réka Somogyfoki, Alessio Famá, Liliana Restuccia, Peter Ván

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Performance analysis of quantum harmonic Otto engine and refrigerator under a trade-off figure of merit 权衡利弊下的量子谐波奥托发动机和制冷机性能分析

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-08-28 DOI: 10.1515/jnet-2024-0034

Kirandeep Kaur, Shishram Rebari, Varinder Singh

{"title":"Performance analysis of quantum harmonic Otto engine and refrigerator under a trade-off figure of merit","authors":"Kirandeep Kaur, Shishram Rebari, Varinder Singh","doi":"10.1515/jnet-2024-0034","DOIUrl":"https://doi.org/10.1515/jnet-2024-0034","url":null,"abstract":"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) and work output (cooling load), thus representing a compromise between them. We obtain analytical expressions for the efficiency and coefficient of performance of the harmonic Otto cycle for the optimal performance of the thermal machine in various operational regimes. Particularly, in the sudden-switch regime, we discuss the implications of the nonadiabatic driving on the performance of the thermal machine under consideration and obtain analytic expressions for the maximum achievable efficiency and coefficient of performance of the harmonic Otto thermal machine. Particularly, we show that the quantum harmonic Otto cycle driven by sudden-switch protocol cannot work as a heat engine or refrigerator in the low-temperature limit. Finally, we show that in the high-temperature limit, the frictional effects give rise to a richer structure of the phase diagram of the harmonic Otto cycle. We identify the parametric regime for the operation of the Otto cycle as a heat engine, refrigerator, accelerator, and heater.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"5 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090068","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}

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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 研究在梅苏阿魏生物柴油中分散了纳米氧化铬 (Cr2O3) 的柴油发动机的运行特性：使用 ANNs 和 RSM 的实验和预测方法

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-08-16 DOI: 10.1515/jnet-2024-0021

Jagadish Kari, Vanthala Varaha Siva Prasad, Jaikumar Sagari

{"title":"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","authors":"Jagadish Kari, Vanthala Varaha Siva Prasad, Jaikumar Sagari","doi":"10.1515/jnet-2024-0021","DOIUrl":"https://doi.org/10.1515/jnet-2024-0021","url":null,"abstract":"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 in the same amounts. The study was carried out with different compression ratios and load conditions. The parameters evaluated were engine load, fuel samples and compression ratio as inputs and BTE, BSFC, CP, NHRR, CO, UHC, NO x and smoke opacity as outputs. The addition of the QPAN80 additive at the same dosage of 80 mg/L together with the BD20 fuel blend containing Cr2O3 at a concentration of 80 mg/L resulted in a significant increase in BTE by 16.58 % and a reduction in BSFC by 0.58 %. While the NHRR increased by 85.40 %, the CP increased sharply by 24.47 %. The CO concentration decreased by 31.85 %, the UHC concentration by 22.22 %, the NO x concentration by 6.16 % and the smoke emission by 62.61 %. For each output parameter, the correlation coefficient (R 2), calculated using ANNs and RSM was between 0.96 and 0.98. The observed range of values demonstrates a robust correlation between the experimental data and the predicted outcomes.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"23 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141994468","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

Analytical solutions for nonequilibrium bioheat transfer in tumor during magnetic nanoparticles hyperthermia 磁性纳米粒子热疗过程中肿瘤内非平衡生物传热的分析解决方案

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-07-23 DOI: 10.1515/jnet-2024-0035

Zuhur Alqahtani, Ibrahim Abbas

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Composite liquids under high-power heating: superheat of water in micro-explosion of water-in-fuel droplets 大功率加热下的复合液体：水包水燃料液滴微爆炸中的水过热现象

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-07-23 DOI: 10.1515/jnet-2024-0017

Alexey Melkikh, Pavel Skripov

{"title":"Composite liquids under high-power heating: superheat of water in micro-explosion of water-in-fuel droplets","authors":"Alexey Melkikh, Pavel Skripov","doi":"10.1515/jnet-2024-0017","DOIUrl":"https://doi.org/10.1515/jnet-2024-0017","url":null,"abstract":"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 droplets. Our attention was drawn to the smallness of the degree of superheating preceding the decay. A model of the boiling up of such a droplet is constructed taking into account the sources of premature boiling up of water inherent in micro-explosive experiments. The dependencies of the boiling up temperature of water on the heating rate obtained in the model turned out to be in accordance with the experimental data across a wide range of heating rates. A hypothesis about the local superheating of the transition layer, which is not detected in the experiment, is formulated. Thus, a step has been taken to clarify the essence of the mismatch of the degree of superheating of water recorded by macroscopic equipment along with a completely satisfactory generation of daughter droplets serving as the basis for advanced fuel technology.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"51 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of a three-laser optical digital interferometry in a thermogravitational analysis for binary and ternary mixtures 三激光光学数字干涉仪在二元和三元混合物热重分析中的应用

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-07-16 DOI: 10.1515/jnet-2023-0126

Ane Errarte, Antton Sanjuan, Aliaksandr Mialdun, Marcos Alonso, Imanol Andonegui, Valentina Shevtsova, M. Mounir Bou-Ali

引用次数: 0

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

IF 6.6 3区工程技术

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

Simon Stephan, Vilde Bråten, Hans Hasse

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

IF 6.6 3区工程技术

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

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

{"title":"Generalized energy-conserving dissipative particle dynamics with mass transfer: coupling between energy and mass exchange","authors":"Giuseppe Colella, Allan D. Mackie, James P. Larentzos, John K. Brennan, Martin Lísal, Josep Bonet Avalos","doi":"10.1515/jnet-2023-0129","DOIUrl":"https://doi.org/10.1515/jnet-2023-0129","url":null,"abstract":"The complete description of energy and material transport within the Generalized energy-conserving dissipative particle dynamics with mass transfer (GenDPDE-M) methodology is presented. In particular, the dynamic coupling between mass and energy is incorporated into the GenDPDE-M, which was previously introduced with dynamically decoupled fluxes (J. Bonet Avalos et al., J. Chem. Theory Comput., 18 (12): 7639–7652, 2022). From a theoretical perspective, we have derived the appropriate Fluctuation-Dissipation theorems along with Onsager’s reciprocal relations, suitable for mesoscale models featuring this coupling. Equilibrium and non-equilibrium simulations are performed to demonstrate the internal thermodynamic consistency of the method, as well as the ability to capture the Ludwig–Soret effect, and tune its strength through the mesoscopic parameters. In view of the completeness of the presented approach, GenDPDE-M is the most general Lagrangian method to deal with complex fluids and systems at the mesoscale, where thermal agitation is relevant.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"20 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141182431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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

IF 6.6 3区工程技术

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

Julio Juan Fernández

引用次数: 0

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

IF 6.6 3区工程技术

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

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

{"title":"Thermodiffusion, diffusion and Soret coefficients of binary polymeric mixtures in toluene and cyclohexane","authors":"Antton Sanjuan, Daniel Sommermann, Werner Köhler, Valentina Shevtsova, M. Mounir Bou-Ali","doi":"10.1515/jnet-2023-0125","DOIUrl":"https://doi.org/10.1515/jnet-2023-0125","url":null,"abstract":"We present the results of experimental study on measuring the thermodiffusion, molecular diffusion and Soret coefficients of polystyrene (4,880 g/mol) in the pure solvents toluene and cyclohexane at 298 K and atmospheric pressure. The experiments have been carried out for a wide range of concentrations, starting from the diluted state with 2 % polystyrene mass fraction (proposed in the DCMIX4 project) up to the semidilute regime of 20 % polystyrene mass fraction. In addition, we present a complete characterisation of the thermophysical properties of the analysed mixtures. Thermodiffusion, molecular diffusion and Soret coefficients of binary polymeric samples have been measured by combining the traditional thermogravitational column technique, the thermogravitational microcolumn and the optical beam deflection method. In toluene, the obtained experimental results are consistent with literature, showing that the magnitude of the mass transport thermoproperties decrease significantly with increasing polystyrene concentration, which is a first indication of an approaching glass transition in the concentrated regime. The results for thermodiffusion and molecular diffusion coefficients in cyclohexane as a function of concentration exhibit a similar trend. Nevertheless, the Soret coefficient seems to show an opposite tendency for the two solvents, increasing in magnitude for cyclohexane, at least up to the analysed polystyrene concentration.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"54 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141096700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0