Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer最新文献

{"title":"State-Of-The-Art Laser-Diagnostic Measurement Techniques Applied To Multiphase Flows","authors":"C. Markides","doi":"10.11159/icmfht21.lx.002","DOIUrl":"https://doi.org/10.11159/icmfht21.lx.002","url":null,"abstract":"Multiphase, and in particular two-phase, flows are encountered in a broad range of settings, from highly complex isothermal flows in upstream and midstream oil-and-gas applications, to flows in the presence of heating or cooling and phase change such as in heat exchangers, condensers, evaporators, absorbers and reactors in diverse industrial processes across a wide range of scales. Despite the numerous and well-performed experimental studies encountered in literature, only a limited number of studies relating to the simultaneous and spatiotemporal variations of the interfaces and underlying velocity and other scalar fields in these flows are currently available; a limitation linked inherently to the many challenges that arise when performing these measurements. Two-phase flows, in particular, present the experimentalist with a unique set of characteristics, including restricted (often sub-mm) fluid domains, moving and complex interfaces, and phases with large density or refractive index changes that render the extraction of reliable information challenging. In this talk, we will present recent efforts to develop and apply a range of laser-based and other combined diagnostic techniques to a number of multiphase flows, both isothermal and in the presence of heat transfer, and extending to phase change processes (boiling and freezing). We will cover isothermal horizontal and inclined liquid-liquid flows, vertical gas-liquid flows and falling film flows, as well as diabatic flows such as heat falling films, and finally flows with phase change due to presence of heat transfer including pool boiling and droplet freezing. Important results from all of these efforts will be presented and new insights discussed.","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128983982","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":"On Drag Reduction and Heat Transferin Turbulent Channel Flow over Circular Dimples: The Shift of the Deepest Point of Dimples","authors":"Y. Eng, C. Tay, B. C. Khoo","doi":"10.11159/enfht21.lx.304","DOIUrl":"https://doi.org/10.11159/enfht21.lx.304","url":null,"abstract":"- In this study, the flow characteristics and enhanced heat transfer performance of circular dimples in a channel flow were numerically analysed and compared with a flat channel. The effect of shifting the deepest point of the dimples in turbulent flow on their drag and heat transfer performance are also discussed. The strength and extent of the induced recirculating flow is suppressed significantly when the deepest point is shifted downstream, enhancing the heat transfer performance of the dimpled wall. At the same time, the flow structure above the dimpled wall is manipulated by the geometry changes. The flow impingement on the dimpled wall increases drag; consequently, the power required to drive the flow is increased. A parametric study is conducted to optimize the shifting of the deepest point to maximize heat transfer performance while minimizing the drag increase.","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130504297","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":"Validation study of Large-Scale Simulation of CO2 or H2O Gasification\u0000with Mass Transfer for Metallurgical Coke","authors":"Yui Numazawa, Y. Matsushita, H. Aoki, Takahiro Shishido, N. Okuyama","doi":"10.11159/csp21.lx.301","DOIUrl":"https://doi.org/10.11159/csp21.lx.301","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133033555","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":"Modelling Of Heat Transfer In Turbulent Bubbly FlowsUsing Direct Numerical Simulations","authors":"Sonolet Aymeric, G. Bois, A. Toutant","doi":"10.11159/icmfht21.lx.105","DOIUrl":"https://doi.org/10.11159/icmfht21.lx.105","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114443791","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":"Numerical Study of the Air Injection Method into the Flat-Panel Photobioreactor","authors":"M. Rebej, J. Vondál, Z. Jegla","doi":"10.11159/enfht21.lx.305","DOIUrl":"https://doi.org/10.11159/enfht21.lx.305","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121983483","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":"Experimental Study on the Solidification Behaviors in a Latent Heat Thermal Energy Storage Unit with Tree-Shaped Fins","authors":"Cheng-Hua Fan, H. Xu, Chengbin Zhang, Zilong Deng","doi":"10.11159/icmfht21.lx.301","DOIUrl":"https://doi.org/10.11159/icmfht21.lx.301","url":null,"abstract":"- the fractal tree-shaped structure is introduced in this paper to configure the fin geometry of a shell-tube LHTES unit. A visualization experimental investigation of the solidification process in the LHTES unit with tree-shaped fins is conducted. The dynamic temperature distribution and the solidification front evolution is analysed and compared to those in a corresponding LHTES with plate fins. Additionally, by arranging a certain number of thermocouples at different positions, the temperature changes of the fin region and the PCM region of the tree-shaped structure heat exchanger were recorded during the experiment. Then, the temperature of PCM at different radial distances is analyzed,","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127484644","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":"Enhancing Heat and Mass Transfer in Adsorption Heat Pumps Using Advanced Metal Organic Framework Materials","authors":"R. AL-Dadah","doi":"10.11159/enfht21.lx.002","DOIUrl":"https://doi.org/10.11159/enfht21.lx.002","url":null,"abstract":"The ever-increasing global energy consumption and the heavy reliance on fossil fuels posing significant worldwide economic and environmental challenges, particularly the increased greenhouse gas (GHG) emissions and the global warming. Current technologies for heating (central heating gas boilers), cooling (electrically driven vapour compression refrigeration systems) and water desalination (Reverse Osmosis) are energy intensive and consume significant amounts of fossil fuels and contribute to GHG emissions. There is a huge amount of unexploited energy including overnight cheap electricity, intermittent renewables and industrial waste heat which can be exploited to reduce fossil fuel consumption and CO2 emission. Heat powered adsorption technology offer potential of using various sources of low-grade thermal energy for cooling, heating and water desalination. However, commercially available adsorption systems utilise silica gel or zeolite adsorbent materials which have limited water adsorption capabilities thus they suffer from being bulky, expensive and have low efficiency. This keynote speech describes the author’s research work for enhancing the performance of heat powered adsorption systems using advanced microporous adsorbent materials known as Metal Organic Framework materials (MOF) and various techniques for enhancing heat and mass transfer in adsorber beds. Metal Organic Frameworks (MOFs) are meso-porous materials with exceptionally high porosity, large surface area (up to 5500m2/g) and superior water uptake capacity (up to 1.5kgw/kgads). MOFs have two main components: the organic linkers which act as struts that bridge metal centres known as inorganic building units. The two main components are connected to each other by coordination bonds to form a network with defined topology. As MOF structures can be constructed with a diversity of metal clusters/ions and organic components to generate porous materials with high surface area, they possess more advantages to tune their properties via structure design. Moreover, the modification of MOFs via functionalisation or post-synthetic modification could offer routes to enhance their thermophysical properties. At University of Birmingham, the author’s research work included the synthesis and characterisation of several MOF materials (MIL101-(Cr), MIL100(Fe), Aluminium Fumarate, CPO27-(NI)) in terms of water adsorption isotherms and kinetics, thermophysical properties like thermal conductivity, specific heat capacity, density and pores surface area. The research work also included enhancing the thermal conductivity by addition of highly conductive graphene oxide and enhancing the adsorption isotherm by adding hygroscopic calcium chloride into the synthesis process. Results showed that adding 5% GrO to MIL101(Cr) increased thermal conductivity by 2.5 times while suspending MIL101(Cr) in CaCl2 salt solution with 8% concentration resulted in modifying the shape of the water adsorption isotherm increa","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114735472","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":"Laminar Burning Velocity Measurements over Wide RangingTemperatures and Pressures","authors":"Richard Stone","doi":"10.11159/csp21.lx.001","DOIUrl":"https://doi.org/10.11159/csp21.lx.001","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116257518","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":"Numerical ModellingOf a Rectangular Shell-And-Tube Heat Exchanger","authors":"M. Slimene, S. Poncet, J. Bessrour, Ftouh Kallel","doi":"10.11159/enfht21.lx.306","DOIUrl":"https://doi.org/10.11159/enfht21.lx.306","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133213266","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":"ANN-based Classification of Operating Data in Humid Air-Water Heat Exchangers","authors":"Gabriela Avila, A. Pacheco-Vega","doi":"10.11159/enfht21.lx.302","DOIUrl":"https://doi.org/10.11159/enfht21.lx.302","url":null,"abstract":"","PeriodicalId":261334,"journal":{"name":"Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121960198","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}