A general phenomenological expression is provided, within the frame of the Gorini-Kossakowski-Sudarshan-Lindblad formalism, for the time (t) development of the density operator ρ(t) during thermalization, namely the process such that an open system with arbitrary initial states, when coupled to a thermal bath, ρ (t -> ∞) takes up a Gibbsian form. The theory is applied to a molecular vibrating system, to a semi-classical vibronic entity, and may be applied to the excitation probabilities in a condensed state’s phonon system and to arbitrarily large-scale systems (reaching as far as global warming). A sideline is to an entropy-decreasing Maxwell-demon type quantum state transition. While the prescription may not be unique, it gives rise to an experimentally testable non-monotonicity in the system’s information entropy. The calculated entropy maximum found for an electronic doublet is interpreted as a “transient democratization” of the states and, though lacking a formal proof, a conjecture is proposed for the occurrence of maxima in general instances.
{"title":"A LINDBLADIAN OPERATOR FOR OPEN SYSTEM THERMALIZATION, WITH APPLICATIONS","authors":"R. Englman","doi":"10.17654/0973576323008","DOIUrl":"https://doi.org/10.17654/0973576323008","url":null,"abstract":"A general phenomenological expression is provided, within the frame of the Gorini-Kossakowski-Sudarshan-Lindblad formalism, for the time (t) development of the density operator ρ(t) during thermalization, namely the process such that an open system with arbitrary initial states, when coupled to a thermal bath, ρ (t -> ∞) takes up a Gibbsian form. The theory is applied to a molecular vibrating system, to a semi-classical vibronic entity, and may be applied to the excitation probabilities in a condensed state’s phonon system and to arbitrarily large-scale systems (reaching as far as global warming). A sideline is to an entropy-decreasing Maxwell-demon type quantum state transition. While the prescription may not be unique, it gives rise to an experimentally testable non-monotonicity in the system’s information entropy. The calculated entropy maximum found for an electronic doublet is interpreted as a “transient democratization” of the states and, though lacking a formal proof, a conjecture is proposed for the occurrence of maxima in general instances.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46191099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aditya Kumar Pati, A. Misra, S. Mishra, Sujit Mishra, R. Sahu, S. Panda
An exploration is carried out to model the heat and mass transfer optimization of Cu-water nanofluid in a natural convective flow over a vertical plane wall with Cu-nanoparticle ionization. Nanoparticle ionization mechanism has been included in the modelling of nanofluid flow. Using the similarity transformation method, the basic two-dimensional momentum, energy, and nanoparticle concentration equations have been transferred to a set of locally similar equations and solved numerically using MATLAB bvp4c function. The impacts of the nanoparticle ionization on the nanofluid flow parameters, skin- friction, heat transfer and nanoparticle mass transfer coefficients are determined and shown graphically. The major outcome of the present study reveals that an increment in the ionization parameter elevates the skin-friction, heat and mass transfer rate from the wall to nanofluid. It is concluded that Cu-nanoparticle ionization contributes towards the augmentation of heat and mass transfer capabilities of Cu-water nanofluid.
{"title":"COMPUTATIONAL MODELLING OF HEAT AND MASS TRANSFER OPTIMIZATION IN COPPER WATER NANOFLUID FLOW WITH NANOPARTICLE IONIZATION","authors":"Aditya Kumar Pati, A. Misra, S. Mishra, Sujit Mishra, R. Sahu, S. Panda","doi":"10.17654/0973576323001","DOIUrl":"https://doi.org/10.17654/0973576323001","url":null,"abstract":"An exploration is carried out to model the heat and mass transfer optimization of Cu-water nanofluid in a natural convective flow over a vertical plane wall with Cu-nanoparticle ionization. Nanoparticle ionization mechanism has been included in the modelling of nanofluid flow. Using the similarity transformation method, the basic two-dimensional momentum, energy, and nanoparticle concentration equations have been transferred to a set of locally similar equations and solved numerically using MATLAB bvp4c function. The impacts of the nanoparticle ionization on the nanofluid flow parameters, skin- friction, heat transfer and nanoparticle mass transfer coefficients are determined and shown graphically. The major outcome of the present study reveals that an increment in the ionization parameter elevates the skin-friction, heat and mass transfer rate from the wall to nanofluid. It is concluded that Cu-nanoparticle ionization contributes towards the augmentation of heat and mass transfer capabilities of Cu-water nanofluid.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45358463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A steady incompressible nanofluid flow past an inclined permeable plate is numerically studied, including radiation, viscous dissipation, and Soret and Dufour effects. A coupled non-linear simultaneous differential similarity equation is created by non-dimensionalizing the ruling partial differential equations. Then, nonlinear coupled equations with transformed boundary conditions are resolved by the shooting method based on the Runge-Kutta fourth-order method. The Prandtl number, Grashof number, Schmidt number, magnetic parameter, and Soret and Dufour effects are just a few of the controlling flow parameters for which computations are done. Graphs are used to illustrate how various flow factors affect momentum, energy, and concentration equations. The impacts of these variables on skin friction coefficients, Nusselt number, and Sherwood number are given in tabular form. The concentration profile increases with the Soret number and the reverse trend is observed with the Dufour number. It is further noted that heat-mass transfer rate reduces in the boundary layer due to an increase in the values of Soret or a decrease in the values of Dufour.
{"title":"MHD NANOFLUID FLOW PAST AN INCLINED PLATE WITH SORET AND DUFOUR EFFECTS","authors":"G. Palani, A. Arutchelvi","doi":"10.17654/0973576323009","DOIUrl":"https://doi.org/10.17654/0973576323009","url":null,"abstract":"A steady incompressible nanofluid flow past an inclined permeable plate is numerically studied, including radiation, viscous dissipation, and Soret and Dufour effects. A coupled non-linear simultaneous differential similarity equation is created by non-dimensionalizing the ruling partial differential equations. Then, nonlinear coupled equations with transformed boundary conditions are resolved by the shooting method based on the Runge-Kutta fourth-order method. The Prandtl number, Grashof number, Schmidt number, magnetic parameter, and Soret and Dufour effects are just a few of the controlling flow parameters for which computations are done. Graphs are used to illustrate how various flow factors affect momentum, energy, and concentration equations. The impacts of these variables on skin friction coefficients, Nusselt number, and Sherwood number are given in tabular form. The concentration profile increases with the Soret number and the reverse trend is observed with the Dufour number. It is further noted that heat-mass transfer rate reduces in the boundary layer due to an increase in the values of Soret or a decrease in the values of Dufour.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42758592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider the problems involving homogeneous Helmholtz equations in anisotropic materials. The problems considered are solved numerically using a dual reciprocity method (DRM). To test the accuracy of the method, the method is tested using problems with analytic solutions. Numerical solutions obtained by the DRM and the corresponding analytical solutions are compared and discussed.
{"title":"A DRM FOR HOMOGENEOUS HELMHOLTZ EQUATIONS IN ANISOTROPIC MATERIALS","authors":"Damarjati Maulana Hilmi, I. Solekhudin","doi":"10.17654/0973576323003","DOIUrl":"https://doi.org/10.17654/0973576323003","url":null,"abstract":"We consider the problems involving homogeneous Helmholtz equations in anisotropic materials. The problems considered are solved numerically using a dual reciprocity method (DRM). To test the accuracy of the method, the method is tested using problems with analytic solutions. Numerical solutions obtained by the DRM and the corresponding analytical solutions are compared and discussed.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42998631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Boubou Bagré, Makinta Boukar, I. Muritala, T. Daho, Jacques Nébié, Téré Dabilgou, E. Mortey, Issoufou Ouarma, Salifou Tera, Armand Korsaga, A. Rabani
This paper addresses industry sector like concentrating solar power (CSP) plant used for electricity generation. Up till now, this technology is not affordable for developing countries where CSP potential is good. To contribute on the improvement of CSP technology, ceramic balls using sand clay and industry waste (coal bottom ash) have been developed for sensible heat storage. In this paper, the one dimensional two phase model has been chosen to predict the behaviour of the ceramic oil and vegetal oil (Jatropha curcas oil) thermal energy storage system. The results show that high porosity (> 45%), filler material with big size and high fluid velocity are not required for thermal energy storage because of the degradation of the thermocline. Taking into account a tank ratio H/D of 2.5 and a total stored energy of the results show a possibility to reach a discharge time of 9 hours with discharge efficiency of more than 90%. The thermocline thickness variation under the variation of fluid velocity, particle diameter, tank porosity shows that for an effective thermal energy storage system, the thermocline maximal thickness is around one third of the packed-bed height. To conclude, the developed ceramic ball and Jatropha curcas oil could be considered as an innovative and cost-effective for thermal energy storage in CSP or other applications like solar cooker.
{"title":"MODELLING AND SIMULATION OF A SUSTAINABLE THERMAL ENERGY STORAGE SYSTEM FOR CONCENTRATING SOLAR POWER (CSP) PLANT USING ECO-MATERIALS","authors":"Boubou Bagré, Makinta Boukar, I. Muritala, T. Daho, Jacques Nébié, Téré Dabilgou, E. Mortey, Issoufou Ouarma, Salifou Tera, Armand Korsaga, A. Rabani","doi":"10.17654/0973576323010","DOIUrl":"https://doi.org/10.17654/0973576323010","url":null,"abstract":"This paper addresses industry sector like concentrating solar power (CSP) plant used for electricity generation. Up till now, this technology is not affordable for developing countries where CSP potential is good. To contribute on the improvement of CSP technology, ceramic balls using sand clay and industry waste (coal bottom ash) have been developed for sensible heat storage. In this paper, the one dimensional two phase model has been chosen to predict the behaviour of the ceramic oil and vegetal oil (Jatropha curcas oil) thermal energy storage system. The results show that high porosity (> 45%), filler material with big size and high fluid velocity are not required for thermal energy storage because of the degradation of the thermocline. Taking into account a tank ratio H/D of 2.5 and a total stored energy of the results show a possibility to reach a discharge time of 9 hours with discharge efficiency of more than 90%. The thermocline thickness variation under the variation of fluid velocity, particle diameter, tank porosity shows that for an effective thermal energy storage system, the thermocline maximal thickness is around one third of the packed-bed height. To conclude, the developed ceramic ball and Jatropha curcas oil could be considered as an innovative and cost-effective for thermal energy storage in CSP or other applications like solar cooker.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43073682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An asymmetric truncated concave parabolic fin is analyzed using a two-dimensional analytical method. In this analysis, the variation in the ratio of the top surface temperature to the bottom surface temperature along the fin length is presented. Heat loss from each surface and that from the fin are shown as a function of the convection characteristic number and the fin base height. The ratios of heat loss from each surface to that from the fin are given as a function of the actual fin length. The relationship between the convection characteristic number and the fin base height, as well as that between the actual fin length and the fin base height, are presented for equal amounts of heat loss. One of the results shows that the effect of fin base height variation on heat loss from the fin bottom surface and on heat loss from the fin tip surface is negligible when the actual fin length is fixed.
{"title":"ANALYSIS OF AN ASYMMETRIC TRUNCATED CONCAVE PARABOLIC FIN","authors":"H. Kang","doi":"10.17654/0973576323007","DOIUrl":"https://doi.org/10.17654/0973576323007","url":null,"abstract":"An asymmetric truncated concave parabolic fin is analyzed using a two-dimensional analytical method. In this analysis, the variation in the ratio of the top surface temperature to the bottom surface temperature along the fin length is presented. Heat loss from each surface and that from the fin are shown as a function of the convection characteristic number and the fin base height. The ratios of heat loss from each surface to that from the fin are given as a function of the actual fin length. The relationship between the convection characteristic number and the fin base height, as well as that between the actual fin length and the fin base height, are presented for equal amounts of heat loss. One of the results shows that the effect of fin base height variation on heat loss from the fin bottom surface and on heat loss from the fin tip surface is negligible when the actual fin length is fixed.","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48442168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Panda, S. Sahoo, A. Barik, Taraprasad Mohapatra, Auroshis Rout
{"title":"THERMAL PERFORMANCE ANALYSIS OF FLAT PLATE SOLAR COLLECTOR USING NANOFLUID: A THEORETICAL APPROACH","authors":"R. Panda, S. Sahoo, A. Barik, Taraprasad Mohapatra, Auroshis Rout","doi":"10.17654/0973576322057","DOIUrl":"https://doi.org/10.17654/0973576322057","url":null,"abstract":"","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48885010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"NANOFLUID FLOW ON NON-LINEARLY STRETCHING SURFACE INFLUENCED BY THE COMBINED EFFECTS OF SORET AND DUFOUR WITH CHEMICAL REACTION","authors":"B. N. Reddy, P. Maddileti, B. S. Reddy","doi":"10.17654/0973576322062","DOIUrl":"https://doi.org/10.17654/0973576322062","url":null,"abstract":"","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48950381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"3D VISUALIZATION OF LOCAL HEAT TRANSFER COEFFICIENTS ON AIRCRAFT HEAT EXCHANGER","authors":"S. Solnař, M. Dostál, J. Moravec, T. Vampola","doi":"10.17654/0973576322063","DOIUrl":"https://doi.org/10.17654/0973576322063","url":null,"abstract":"","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47225553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Dmitrenko, M. I. Kolpakov, M. Kolosova, S. A. Zakutnov, D. A. Boychenko
{"title":"CALCULATION OF THE CONDENSING UNIT FOR ORC ELECTRIC POWER COMPLEXES BASED ON STOCHASTIC EQUATIONS AND SEMI-EMPIRICAL DEPENDENCIES","authors":"A. Dmitrenko, M. I. Kolpakov, M. Kolosova, S. A. Zakutnov, D. A. Boychenko","doi":"10.17654/0973576322056","DOIUrl":"https://doi.org/10.17654/0973576322056","url":null,"abstract":"","PeriodicalId":39006,"journal":{"name":"JP Journal of Heat and Mass Transfer","volume":"193 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41310497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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