Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006349
A. Çağlar, C. Yamali
A coupled heat and mass transfer analysis of the adsorbent bed of a thermal wave adsorption cooling cycle is performed. The adsorbent bed is modeled two dimensionally. Governing equations for energy, mass and momentum transfers are solved by Comsol Multiphysics simultaneously. Variations of temperature, pressure, adsorption capacity, equilibrium adsorption capacity and mass transfer coefficient for a finless tube adsorbent bed are presented with multicolored plots. Desorption process is simulated in the model. Results show that the adsorbent bed reaches the maximum cycle temperature uniformly after 5000s. Uniform pressure assumption can be used in the bed due to small pressure gradient during the process. Adsorption capacity decreases from 26.1% to 8.89% in 5000s. Temperature front progresses along the bed creating a thermal wave. The thermal wave length is needed to be short to enhance the bed effectiveness regenerating more heat between the beds of the thermal wave cycle. It can be concluded that a parametric study is recommended for a future work in order to investigate the effects of design and operational parameters on the dependent variables and thermal wave length.
{"title":"Analysis of heat and mass transfer in the adsorbent bed of a thermal wave adsorption cooling cycle","authors":"A. Çağlar, C. Yamali","doi":"10.1615/COMPUTTHERMALSCIEN.2013006349","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006349","url":null,"abstract":"A coupled heat and mass transfer analysis of the adsorbent bed of a thermal wave adsorption cooling cycle is performed. The adsorbent bed is modeled two dimensionally. Governing equations for energy, mass and momentum transfers are solved by Comsol Multiphysics simultaneously. Variations of temperature, pressure, adsorption capacity, equilibrium adsorption capacity and mass transfer coefficient for a finless tube adsorbent bed are presented with multicolored plots. Desorption process is simulated in the model. Results show that the adsorbent bed reaches the maximum cycle temperature uniformly after 5000s. Uniform pressure assumption can be used in the bed due to small pressure gradient during the process. Adsorption capacity decreases from 26.1% to 8.89% in 5000s. Temperature front progresses along the bed creating a thermal wave. The thermal wave length is needed to be short to enhance the bed effectiveness regenerating more heat between the beds of the thermal wave cycle. It can be concluded that a parametric study is recommended for a future work in order to investigate the effects of design and operational parameters on the dependent variables and thermal wave length.","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"97-106"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419897","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006532
Simon Kattoura, Alexandre Lamoureux, B. R. Baliga
The formulation and testing of a control-volume finite element method (CVFEM) for the prediction of three-dimensional, linear and nonlinear, diffusion-type phenomena in anisotropic media in irregular calculation domains are presented and discussed in this paper. In this CVFEM, the calculation domain is discretized into four-node tetrahedral elements. Contiguous, non-overlapping, polyhedral control volumes are then associated with each node, and the governing differential equation is integrated over these control volumes. The dependent variable is interpolated linearly in each four-node tetrahedral element. Centroidal values of the diffusion coefficients are stored and assumed to prevail over the corresponding tetrahedral element. The source term is linearized, and nodal values of its coefficients are stored and assumed to prevail over the polyhedral sub-control volumes. Using these interpolation functions, the discretized equations, which are algebraic approximations to the integral conservation equations, are derived. The discretized equations, which in general, are nonlinear and coupled, are solved using an iterative procedure. The proposed CVFEM for the solution of anisotropic diffusion- type problems appears to be the first such method that is based on tetrahedral elements and vertex-centered polyhedral control volumes. These features make it particularly attractive for amalgamation with adaptive-grid schemes and applications to problems with complex irregular geometries, such those encountered in the general areas of drying, ground-water flows, conduction in composite materials, injection molding in heterogeneous porous media, and solidification. The proposed three-dimensional CVFEM and its computer implementation were tested using several steady conduction-type problems, for which analytical solutions were constructed using a special technique. In all cases, the agreement between the numerical and analytical solutions was excellent.
{"title":"A control-volume finite element method for the prediction of three-dimensional diffusion-type phenomena in anisotropic media","authors":"Simon Kattoura, Alexandre Lamoureux, B. R. Baliga","doi":"10.1615/COMPUTTHERMALSCIEN.2013006532","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006532","url":null,"abstract":"The formulation and testing of a control-volume finite element method (CVFEM) for the prediction of three-dimensional, linear and nonlinear, diffusion-type phenomena in anisotropic media in irregular calculation domains are presented and discussed in this paper. In this CVFEM, the calculation domain is discretized into four-node tetrahedral elements. Contiguous, non-overlapping, polyhedral control volumes are then associated with each node, and the governing differential equation is integrated over these control volumes. The dependent variable is interpolated linearly in each four-node tetrahedral element. Centroidal values of the diffusion coefficients are stored and assumed to prevail over the corresponding tetrahedral element. The source term is linearized, and nodal values of its coefficients are stored and assumed to prevail over the polyhedral sub-control volumes. Using these interpolation functions, the discretized equations, which are algebraic approximations to the integral conservation equations, are derived. The discretized equations, which in general, are nonlinear and coupled, are solved using an iterative procedure. The proposed CVFEM for the solution of anisotropic diffusion- type problems appears to be the first such method that is based on tetrahedral elements and vertex-centered polyhedral control volumes. These features make it particularly attractive for amalgamation with adaptive-grid schemes and applications to problems with complex irregular geometries, such those encountered in the general areas of drying, ground-water flows, conduction in composite materials, injection molding in heterogeneous porous media, and solidification. The proposed three-dimensional CVFEM and its computer implementation were tested using several steady conduction-type problems, for which analytical solutions were constructed using a special technique. In all cases, the agreement between the numerical and analytical solutions was excellent.","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"249-260"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419490","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006896
A. K. Chowdhuri, S. Chakrabarti, B. Mandal
{"title":"NUMERICAL STUDY OF RADIATION AND AIRPREHEATING EFFECT ON THE VELOCITY, TEMPERATURE, AND SPECIES DISTRIBUTION IN A CONFINED LAMINAR COFLOW DIFFUSION FLAME","authors":"A. K. Chowdhuri, S. Chakrabarti, B. Mandal","doi":"10.1615/COMPUTTHERMALSCIEN.2013006896","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006896","url":null,"abstract":"","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"425-440"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419838","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006127
A. Rasekh, D. Ganji, S. Tavakoli
{"title":"ANALYTICAL SOLUTION FOR NATURAL CONVECTION HEAT TRANSFER ABOUT A VERTICAL CONE IN POROUS MEDIA FILLED WITH A NON-NEWTONIAN Al2O3-WATER NANOFLUID","authors":"A. Rasekh, D. Ganji, S. Tavakoli","doi":"10.1615/COMPUTTHERMALSCIEN.2013006127","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006127","url":null,"abstract":"","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"73-82"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419419","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006435
Alexander M. Molchanov
{"title":"TWO-EQUATION TURBULENCE MODEL FOR SUPERSONIC FLOWS BASED ON MODELING OF PRESSURE–STRAIN CORRELATION","authors":"Alexander M. Molchanov","doi":"10.1615/COMPUTTHERMALSCIEN.2013006435","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006435","url":null,"abstract":"","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"239-248"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419476","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013007372
J. Meyer
This issue ofComputational Thermal Sciences contains some of the papers which were presented at HEFAT2012: The International Conference on Heat Transfer, Fluid Mechanics, and Thermodynamics, held on 16–18 July 2012 on Malta. At the conference, a total of 270 papers were read, including six keynote papers. From these papers, approximately 20 authors were invited to submit papers (most of the papers were amended since presentation) for consideration to be published in this journal. After being peer-reviewed, 14 papers were accepted for publication as two issues of this journal. Previous conferences in this series took place in the Kruger National Park, South Africa (2002), Victoria Falls, Zambia (2003), Cape Town (2004), Cairo (2005), Sun City (2006), Pretoria (2008), Antalya (2010), and Mauritius (2011). The goal of the HEFAT conferences is to provide a forum at which specialists in heat transfer, fluid mechanics, and thermodynamics from all corners of the globe can present the latest progress and developments in the field. The conferences have also served as a catalyst for discus-
{"title":"PREFACE: INTERNATIONAL CONFERENCE ON HEAT TRANSFER, FLUID MECHANICS AND THERMODYNAMICS 2012","authors":"J. Meyer","doi":"10.1615/COMPUTTHERMALSCIEN.2013007372","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013007372","url":null,"abstract":"This issue ofComputational Thermal Sciences contains some of the papers which were presented at HEFAT2012: The International Conference on Heat Transfer, Fluid Mechanics, and Thermodynamics, held on 16–18 July 2012 on Malta. At the conference, a total of 270 papers were read, including six keynote papers. From these papers, approximately 20 authors were invited to submit papers (most of the papers were amended since presentation) for consideration to be published in this journal. After being peer-reviewed, 14 papers were accepted for publication as two issues of this journal. Previous conferences in this series took place in the Kruger National Park, South Africa (2002), Victoria Falls, Zambia (2003), Cape Town (2004), Cairo (2005), Sun City (2006), Pretoria (2008), Antalya (2010), and Mauritius (2011). The goal of the HEFAT conferences is to provide a forum at which specialists in heat transfer, fluid mechanics, and thermodynamics from all corners of the globe can present the latest progress and developments in the field. The conferences have also served as a catalyst for discus-","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"52 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1615/COMPUTTHERMALSCIEN.2013007372","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419598","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013006317
J. Oosterhuis, S. Bühler, D. Wilcox, T. V. D. Meer
A concentric gas-to-gas heat exchanger is designed for application as a recuperator in the domestic boiler industry. The recuperator recovers heat from the exhaust gases of a combustion process to preheat the ingoing gaseous fuel mixture resulting in increased fuel efficiency. This applied study shows the use of computational fluid dynamics simulations as an efficient design tool for heat exchanger design. An experimental setup is developed and the simulation results are validated
{"title":"Design of a concentric heat exchanger using computational fluid dynamics as design tool","authors":"J. Oosterhuis, S. Bühler, D. Wilcox, T. V. D. Meer","doi":"10.1615/COMPUTTHERMALSCIEN.2013006317","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013006317","url":null,"abstract":"A concentric gas-to-gas heat exchanger is designed for application as a recuperator in the domestic boiler industry. The recuperator recovers heat from the exhaust gases of a combustion process to preheat the ingoing gaseous fuel mixture resulting in increased fuel efficiency. This applied study shows the use of computational fluid dynamics simulations as an efficient design tool for heat exchanger design. An experimental setup is developed and the simulation results are validated","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"165-176"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419797","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2012004125
M. Lamsaadi, M. Naïmi, H. E. Harfi, A. Raji, M. Hasnaoui
{"title":"ON THE STEADY AND UNSTEADY ASPECTS OF COMBINED SORET EFFECT AND DOUBLE-DIFFUSIVE CONVECTION IN A BENARD SQUARE CAVITY SUBMITTED TO A HORIZONTAL GRADIENT OF CONCENTRATION","authors":"M. Lamsaadi, M. Naïmi, H. E. Harfi, A. Raji, M. Hasnaoui","doi":"10.1615/COMPUTTHERMALSCIEN.2012004125","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2012004125","url":null,"abstract":"","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"43-61"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67418528","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}
Pub Date : 2013-01-01DOI: 10.1615/COMPUTTHERMALSCIEN.2013007411
L. A. Fil'shtinskii, T. Kirichok
{"title":"DYNAMIC THERMOELASTICITY FOR TWO-DIMENSIONAL ANISOTROPIC MEDIA WITH A HOLE","authors":"L. A. Fil'shtinskii, T. Kirichok","doi":"10.1615/COMPUTTHERMALSCIEN.2013007411","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2013007411","url":null,"abstract":"","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":"5 1","pages":"489-501"},"PeriodicalIF":1.5,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67419646","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：