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• W1489576980 abstract "In mechanical and environmental engineering, mixed convection is a frequently encountered thermal fluid phenomenon which exists in atmospheric environment, urban canopy flows, ocean currents, gas turbines, heat exchangers, and computer chip cooling systems etc... . This paper deals with a numerical investigation of mixed convection in a vertical heated channel. This flow results from the mixing of the up-going fluid along walls of the channel with the one issued from a flat nozzle located in its entry section. The fluid- dynamic and heat-transfer characteristics of vented vertical channels are investigated for constant heat-flux boundary conditions, a Rayleigh number equal to 2.57 10 10 , for two jet Reynolds number Re=3 10 3 and 210 4 and the aspect ratio in the 8-20 range. The system of governing equations is solved with a finite volumes method and an implicit scheme. The obtained results show that the turbulence and the jet-wall interaction activate the heat transfer, as does the drive of ambient air by the jet. For low Reynolds number Re=3 10 3 , the increase of the aspect Ratio enhances the heat transfer of about 3%, however; for Re=2 10 4 , the heat transfer enhancement is of about 12%. The numerical velocity, pressure and temperature fields are post-processed to compute the quantities of engineering interest such as the induced mass flow rate, and average Nusselt number, in terms of Rayleigh, Reynolds numbers and dimensionless geometric parameters are presented. and natural convection was initiated in the 1960's and mainly based on experimental approaches. Natural convection between heated vertical parallel plates is the most frequently used configuration in convection air cooling of electronic equipment. The passive character of cooling by natural convection makes it very attractive for applications in electronic devices. A review of the literature shows that laminar natural convection in vertical channel has been studied by several authors: Elenbaas (1) led the first experimental study which was used in the follow as reference solution. Bodoi and Osterle (2) have obtained the first numerical solution of the natural convection in vertical channel. Their results were in good agreement with those Elenbaas. In order to increase the cooling requirements, researches for methods to improve the heat transfer parameters or to analyze standard configurations to carry out optimal geometrical parameters for a better heat transfer rate" @default.
• W1489576980 created "2016-06-24" @default.
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• W1489576980 date "2009-09-22" @default.
• W1489576980 modified "2023-09-25" @default.
• W1489576980 title "Mixed Convection in a Vertical Heated Channel: Influence of the Aspect Ratio" @default.
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• W1489576980 doi "https://doi.org/10.5281/zenodo.1074633" @default.
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