Forced convection heat transfer from a heated rotating sphere in laminar flow revisited

Abstract

In a paper published recently in Journal of Heat Transfer (Feng [1] ) the forced convective heat transfer from a heated rotating sphere in laminar flow was investigated numerically using a direct numerical simulation. There were significant discrepancies between [1] and previous studies. In the present paper we solved the same problem with another numerical method. The present fluid dynamics results are compared with the results of two previous numerical works and another experimental work and the comparison was very good. Afterwards the heat transfer problem was solved and we found large discrepancies between our results and those of Feng [1] which reach up to 38% for the isothermal case. New correlations for the mean Nusselt number for air have been developed for isothermal and constant heat flux case. The results for the heat flux case are new in the literature.