NSU Research Contributions

Title : Non-Newtonian shear thinning effect on natural convection flow over an isothermal elliptical cylinder

Authors : Preetom Nag, Md. Mamun Molla, and Md. Anwar Hossain

Abstract : In this paper, laminar natural convection flow of Newtonian and non-Newtonian (shear thinning case only) fluid surround an isothermal horizontal cylinder of the elliptic cross-section has been studied numerically. A modified power-law viscosity model has been employed to characterize the non-Newtonian fluid's behavior. The boundary layer equations governing the flow are transformed into a non-dimensional form, and the resulting equations are reduced to a convenient form which is solved numerically by an efficient implicit finite difference method. Numerical results are presented for two significant physical quantity such as the local skin friction coefficients and the rate of surface heat transfer (i.e., the local Nusselt number) as a function of the eccentric angle of an elliptical configuration with different aspect ratio and different orientation such as blunt and slender. The local skin friction is found to be higher for Newtonian fluid than that of the shear-thinning fluid. Furthermore, the total heat transfer rate becomes higher for an elliptical cylinder with slender orientation than that of the blunt orientation in the fluids of interest.

Journal :	Volume :	Year : 2019	Issue :
Pages : 030015(1-8)	City : Dhaka	Edition : 2121	Editors :
Publisher : American Institute of Physics (AIP)	ISBN :	Book :	Chapter :
Proceeding Title : 8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING	Institution :	Issuer :	Number :