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Numerical Investigation of Conjugate Natural Convection Heat Transfer from Discrete Heat Sources in Rectangular Enclosure

yes / The coupling between natural convection and conduction within rectangular enclosure was investigated numerically. Three separate heat sources flush mounted on a vertical wall and an isoflux condition was applied at the back of heat sources. Continuity, momentum and energy conservation equations were solved by using control volume formulation and the coupling of velocity and pressure was treated by using the β€œSIMPLE” algorithm. The modified Rayleigh number and the substrate/fluid thermal conductivity ratio were used in the range π‘Ήπ’‚π’π’›βˆ—=𝟏𝟎^πŸ’βˆ’πŸπŸŽ^πŸ• and 𝑹𝒔=πŸπŸŽβˆ’πŸπŸŽπŸŽπŸŽ respectively. The investigation was extended to compare results of FC-77 with Air and also for high values of 𝑹𝒔>𝟏𝟎𝟎𝟎. The results illustrated that, when the modified Rayleigh number increases, dimensionless heat flux and local Nusselt number increases for both fluids. Opposite behaviour for the thermal spreading in the substrate and the dimensionless temperature 𝜽, they were decreased when π‘Ήπ’‚π’π’›βˆ— is increased. Also with increasing the substrate/fluid thermal conductivity ratio for a given value of the modified Rayleigh number the thermal spreading in the substrate increased which is the reason of the decrease in the maximum temperature value. The present study concluded that, for high values of 𝑹𝒔>πŸπŸ“πŸŽπŸŽ, the effect of the substrate is negligible.
Date January 2014
CreatorsGdhaidh, Farouq A.S., Hussain, Khalid, Qi, Hong Sheng
Source SetsBradford Scholars
Detected LanguageEnglish
TypeConference paper, published version paper
RightsΒ© 2014 International Association of Engineers. Reproduced with permission from the publisher.

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