Abstract
In this chapter, consideration is given to natural convective heat transfer from horizontal heated plane surfaces of relatively simple shape that are imbedded in a surrounding adiabatic surface, the heated and adiabatic surfaces being in the same horizontal plane. Attention is limited to surfaces that have a uniform surface temperature, i.e., which are isothermal, and to cases where, if there is a heated surface, it is facing upward and if there is a cooled surface, it is facing downward. Natural convective heat transfer from heated surfaces having circular, square, and rectangular shapes is considered. In addition, consideration is also given to the natural convective heat transfer from a plane two-dimensional surface. The results for the rectangular surface for the various aspect ratio values considered have been expressed in terms of Nusselt and Rayleigh numbers based on the characteristic length and the variations obtained for all aspect ratios considered are shown to be effectively the same in the laminar and fully turbulent flow regions.
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References
Oosthuizen PH (2014) Natural convective heat transfer from an inclined isothermal square flat element mounted in a flat adiabatic surrounding surface. In: Proceedings of the 15th international heat transfer conference (IHTC-15)
Oosthuizen PH (2015) A numerical study of natural convective heat transfer from a horizontal isothermal square element with an unheated adiabatic inner section. In: Proceedings of the 11th international conference on heat transfer, fluid mechanics and thermodynamics (HEFAT 2015)
Oosthuizen PH (2016) A numerical study of the effect of triangular waves on natural convective heat transfer from an upward facing heated horizontal isothermal surface. In: Proceedings of the ASME 2016 international mechanical engineering congress and exposition
Oosthuizen PH, Kalendar AY (2015) A numerical study of natural convective heat transfer from a pair of adjacent horizontal isothermal square elements embedded in an adiabatic surface-effect of element spacing on heat transfer rate. In: Proceedings of the 11th international conference on heat transfer, fluid mechanics and thermodynamics (HEFAT 2015)
Oosthuizen PH, Kalendar AY (2015) Laminar and turbulent natural convective heat transfer from a horizontal isothermal circular element with an unheated inner circular section. In: Proceedings of the CFD society of Canada 23rd annual conference
Oosthuizen PH (2015) Laminar, transitional and turbulent natural convective heat transfer from a horizontal rectangular isothermal element imbedded in a flat adiabatic surrounding surface. In: Proceedings of ICHMT international symposium on advances in computational heat transfer (CHT-15) Paper CHT-15-145
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Oosthuizen, P.H., Kalendar, A.Y. (2018). Natural Convective Heat Transfer from Horizontal Isothermal Circular, Square, Two-Dimensional, and Rectangular Shaped Surfaces. In: Natural Convective Heat Transfer from Horizontal and Near Horizontal Surfaces. SpringerBriefs in Applied Sciences and Technology(). Springer, Cham. https://doi.org/10.1007/978-3-319-78750-3_2
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DOI: https://doi.org/10.1007/978-3-319-78750-3_2
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