ISSN Online: 2377-424X
International Heat Transfer Conference 5
FREE CONVECTION EFFECTS ON GRAETZ PROBLEM FOR LARGE PRANDTL NUMBER FLUIDS IN HORIZONTAL TUBES WITH UNIFORM WALL HEAT FLUX
Abstrakt
Combined free and forced laminar convection in the thermal entrance region of horizontal tubes with uniform
wall heat flux is approached by a numerical method for large Prandtl number fluids. The analysis is based
on the observation that as Pr → ∞ the primary flow becomes independent of the secondary flow but the convective terms due to secondary flow are important in the energy equation. The numerical results are compared
against the available experimental data with generally good agreement. The theoretical results
together with the available experimental results contribute to the basic understanding of a combined
convection phenomenon.