Entropy analysis in an unsteady MHD flow of a radiating fluid through a vertical channel filled with a porous medium.

Abstract

This paper investigates the blended effects of thermal buoyancy, magnetic field and radiative heat flux on the unsteady flow of an electrically conducting fluid through a permeable walled passageway filled with a penetrable medium. The model non-linear partial differential equations are obtained and solved analytically using separation of variable techniques and numerical for fluid velocity and fluid temperature. The two functions are then used to obtain entropy generation rate, skin friction, Nusselt number and the Bejan number. The effects of manifold novel parameters on the overall flow structure and thermal putrefaction are displayed graphically and discussed. One of the crucial findings of the current model is that entropy generation rate diminished temporally and with an upsurge in a magnetic field but amplified with a soar in porous medium permeability, thermal buoyancy and fluid Prandtl number.

KEYWORDS:

• MHD
• vertical channel
• unsteady flow
• radiating fluid
• porous medium
• entropy generation rate

Disclosure statement

No potential conflict of interest was reported by the author(s).