Effects of Radiation on an Unsteady Natural Convective Flow of a EG-Nimonic 80a Nanofluid Past an Infinite Vertical Plate

Abstract

In this study, we analyse the effects of thermal radiation on unsteady natural convective flow of a nanofluid past an impulsively started infinite vertical plate. The nanofluid contains heat treatable nickel chromium iron alloy (Nimonic 80A) nanoparticles with Ethylene Glycol as base fluid. The partial differential equations governing the flow are solved numerically by MATALB pde solver package. The effects of various parameters on velocity and temperature profiles, as well as Nusselt number and Skin friction coefficient are examined and presented graphically .It is found that rate of heat transfer increases by increase in thermal radiation and change of particle shape. Also we observed that the decrease in radiation parameter leads to fall the value of skin friction coefficient. Shape of nanoparticles doesn’t effects velocity of the fluid.

Key Words: Heat transfer, Nanofluids, Thermal radiation, free convection, Volume fraction.