Journal of Non-Equilibrium Thermodynamics最新文献_第8页

Heat transfer effect on the performance of three-heat-reservoir thermal Brownian refrigerator 传热对三热源布朗制冷机性能的影响

3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-10-09 DOI: 10.1515/jnet-2023-0050

Congzheng Qi, Lingen Chen, Yanlin Ge, Huijun Feng

{"title":"Heat transfer effect on the performance of three-heat-reservoir thermal Brownian refrigerator","authors":"Congzheng Qi, Lingen Chen, Yanlin Ge, Huijun Feng","doi":"10.1515/jnet-2023-0050","DOIUrl":"https://doi.org/10.1515/jnet-2023-0050","url":null,"abstract":"Abstract 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 system performance is studied and compared with those of previous models. For fixed internal parameters, the thermal conductance distributions among three heat exchangers are optimized for maximal cooling load. For fixed inventory allocations, the internal parameters are also optimized for maximal cooling load. Finally, the double-maximum cooling load is obtained by optimizing internal parameters and external thermal conductance distributions simultaneously, and the optimal operating temperatures are also derived. Results show that half of total thermal conductance should be placed in condenser to reject heat to ambient under maximal cooling load regime. The heat transfer determines system performance by controlling the working temperatures and the coupling of two external loads. The system works in reversible state when COP reaches its maximum value. The new performance limits can predict that of three-heat-reservoir thermal Brownian refrigerator more accurately, and also include those of NET model.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044125","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: 2

Frontmatter 头版头条

3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-10-01 DOI: 10.1515/jnet-2023-frontmatter4

引用次数: 0

Improved modeling of Janus membrane considering the influence of hydrophilic layer characteristics 考虑亲水层特性影响的Janus膜的改进建模

3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-09-18 DOI: 10.1515/jnet-2023-0037

Noha M. Sayed, Hussien Noby, Kyaw Thu, Ahmed H. El-Shazly

{"title":"Improved modeling of Janus membrane considering the influence of hydrophilic layer characteristics","authors":"Noha M. Sayed, Hussien Noby, Kyaw Thu, Ahmed H. El-Shazly","doi":"10.1515/jnet-2023-0037","DOIUrl":"https://doi.org/10.1515/jnet-2023-0037","url":null,"abstract":"Abstract 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 Ansys 2020 was used to describe the transport behavior through the Janus membrane. The bulk-flow model was employed to evaluate the permeate flow through the hydrophilic layer for the first time. Simulation results were compared with the experimental results from the literature for validating the model, and a satisfactory agreement was found. Results demonstrated that the permeate flux increased by about 61.3 % with changing the porosity of the hydrophilic layer from 0.5 to 0.9 for the membrane with the lowest hydrophilic layer thickness. Moreover, the thermal conductivities of both layers contribute significantly to the DCMD’s overall performance enhancement. Vapour flux might be enhanced by increasing the hydrophilic layer’s thermal conductivity while decreasing the hydrophobic layer’s thermal conductivity. Finally, the DCMD thermal efficiency was investigated, for the first time, in terms of both layer characteristics.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135110266","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 non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle 非理想气体工质对不可逆奥托循环功率和效率的影响

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-09-07 DOI: 10.1515/jnet-2023-0036

Di Wu, Y. Ge, Lingen Chen, Lei Tian

{"title":"Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle","authors":"Di Wu, Y. Ge, Lingen Chen, Lei Tian","doi":"10.1515/jnet-2023-0036","DOIUrl":"https://doi.org/10.1515/jnet-2023-0036","url":null,"abstract":"Abstract 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 and non-ideal gas under different specific heat models. The results demonstrate that, with the increase of d, the maximum-power-output (Pmax), the maximum-thermal-efficiency (ηmax), the corresponding optimal compression-ratio ( ( γ opt ) p ${({gamma }_{text{opt}})}_{p}$ ) and efficiency (η P ) at the Pmax point, and the corresponding optimal compression ratio ( ( γ opt ) η ${({gamma }_{text{opt}})}_{eta }$ ) and power (P η ) at the ηmax point will all increase; the Pmax, ( γ opt ) p ${({gamma }_{text{opt}})}_{p}$ , ηmax, ( γ opt ) η ${({gamma }_{text{opt}})}_{eta }$ , η p and P η will decrease with the increases of three irreversible losses; the specific heat model has only quantitative effect on cycle performance but no qualitative effect; under condition of non-ideal gas specific heat model, the power and efficiency are the smallest.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":" ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44655173","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: 3

Computational radiative transport in complex geometries using orthogonal coordinates 利用正交坐标计算复杂几何中的辐射输运

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-09-05 DOI: 10.1515/jnet-2023-0009

Md. Ershadul Haque, S. Mansoor, B. Yilbas

引用次数: 0

Investigation of non-equilibrium separation time on the partitioning of cephalexin in an aqueous two-phase system composed of glucose and acetonitrile 非平衡分离时间对头孢氨苄在葡萄糖-乙腈双水相体系中分配的影响

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-07-17 DOI: 10.1515/jnet-2023-0028

Parsa Movahedi, Ali Jalali Qush Qayeh, Javad Rahbar Shahrouzi

{"title":"Investigation of non-equilibrium separation time on the partitioning of cephalexin in an aqueous two-phase system composed of glucose and acetonitrile","authors":"Parsa Movahedi, Ali Jalali Qush Qayeh, Javad Rahbar Shahrouzi","doi":"10.1515/jnet-2023-0028","DOIUrl":"https://doi.org/10.1515/jnet-2023-0028","url":null,"abstract":"Abstract 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 conditions for separating cephalexin in an ATPS consisting of acetonitrile, glucose, and water. Firstly, the evolution of the interphase region was observed. Hereafter, to examine the effect of time on the experimental tie-lines and partition coefficient in non-equilibrium states, the settling time was varied from 2 min to 24 h. In addition, centrifugation was applied to help the separation at different time intervals and rotational speeds. The results of tie-lines slope and partitioning coefficients showed that the system approaches equilibrium after 5 h. However, using the centrifuge separation at 4000 rpm improved the separation time to 45 min, reaching 80 % of the actual partition coefficient. It can be concluded that with an acceptable tolerance in the partition coefficient, a remarkably diminished settling time is available for economic productivity in industrial units.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":" ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45751585","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

Uncovering enzymatic structural adaptations from energy dissipation 从能量耗散中揭示酶的结构适应性

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-07-07 DOI: 10.1515/jnet-2023-0044

A. Arango-Restrepo, D. Barragán, J. Rubí

引用次数: 0

Frontmatter 头版头条

3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-06-13 DOI: 10.1515/jnet-2023-frontmatter3

引用次数: 0

Relations between timescales of stochastic thermodynamic observables 随机热力学可观测度的时间尺度关系

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-05-16 DOI: 10.1515/jnet-2022-0104

Erez Aghion, Jason R. Green

引用次数: 0

Concepts of phenomenological irreversible quantum thermodynamics II: time dependent statistical ensembles of bipartite systems 唯象不可逆量子热力学的概念Ⅱ：二分系统的时间相关统计系综

IF 6.6 3区工程技术

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-04-27 DOI: 10.1515/jnet-2023-0023

W. Muschik

{"title":"Concepts of phenomenological irreversible quantum thermodynamics II: time dependent statistical ensembles of bipartite systems","authors":"W. Muschik","doi":"10.1515/jnet-2023-0023","DOIUrl":"https://doi.org/10.1515/jnet-2023-0023","url":null,"abstract":"Abstract 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 in decomposed systems. Thus, the following two-stage task arises: How to modify von Neumann’s equation of undecomposed systems so that irreversibility appears, and how this modification affects decomposed systems? The first step was already done in Muschik (“Concepts of phenomenological irreversible quantum thermodynamics: closed undecomposed Schottky systems in semi-classical description,” J. Non-Equilibrium Thermodyn., vol. 44, pp. 1–13, 2019) and is repeated below, whereas the second step to formulate a quantum thermodynamics of decomposed systems is performed here by modifying the von Neumann equations of the sub-systems by a procedure wich is similar to that of Lindblad’s equation (G. Lindblad, “On the generators of quantum dynamical semigroups,” Commun. Math. Phys., vol. 48, p. 119130, 1976), but different because the sub-systems interact with one another through partitions.","PeriodicalId":16428,"journal":{"name":"Journal of Non-Equilibrium Thermodynamics","volume":" ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42969255","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