Engineering and Technology Journal

Abstract

A numerical investigation of laminar mixed convection around horizontal isothermal
cylinder is presented. The free stream direction varies between the vertically upward
(assisting flow) and vertically downward (opposing flow). The governing equation in terms
of the stream function, vorticity and temperature are expressed in a body-fitted coordinate
system and solved numerically by explicit method. Results are presented for Reynolds
number from 20 to 300 with Grashof numbers from 0 to 120000. The Prandtl number was
kept constant at 0.7. Correlation for the average Nusselt number around the cylinder in the
forced and mixed convection regime is suggested. Comparison with previous theoretical and
experimental results shows good agreement. It was established that the maximum heat
transfer from cylinder occurs in case of assisting flow