Author(s)

B.T.F. Chung & Z.J. Zhang

Abstract

Heat transfer from thermally developing flow of non-Newtonian fluids in rectangular ducts B.T.F. Chung & Z.J. Zhang Department of Mechanical Engineering, The University of Akron, Akron, ABSTRACT The purpose of this work is to determine numerically the Nusselt number of hydrodynamically fully developed and thermally developing flow of power law non-Newtonian fluids in a rectangular duct. Three boundary conditions, namely, T, HI and H2 are taken into account. The effects of the power law index and duct aspect ratio on Nusselt number and the thermal entrance length are investigated. Under certain limiting conditions, the present solutions compare very well with some numerical results available in the literature. NOMENCLATURE a 1/2 duct width b 1/2 duct height Dh duct hydraulic diameter, characteristic length f fanning friction factor, (-dp/dx)(Dj/4)/(puJV2) h heat transfer coefficient k fluid thermal conductivity K parameter in

Keywords