Abstract
The aim of the present paper is to analyze the transient Couette nanofluid flow of ethylene glycol(EG)-Ferrous oxide(Fe3O4) between two parallel plates in the presence of thermal radiation. Tiwari and Das nanofluid model is assumed to frame the governing equations. The novelty of the study is combining the effects of thermal radiation and Couette flow with pulsative pressure gradient. It is important because of its applications in the lubricant technology and advanced energy conversion systems operated at high temperature. The effects of dimensionless quantities such as radiation parameter(Rd=0.1 – 0.5), Biot number(Bi=1 4), nanoparticle volume fraction(), pressure gradient(A=1 3), amplitude pulse() stretching parameter() and viscosity variation parameter() are explored graphically. The main conclusion that can be drawn from the results is that high velocity region of steady state is strengthened near the upper plate with the growth in stretching parameter rather thermal radiation. The temperature near the upper plate enhances with thermal radiation. A vortex is formed in the upper half region of Couette channel with the increase in the phase angle, amplitude and pressure gradient. The temperature in the upper region of Couette channel, is significantly enhanced by the volume fraction of nanoparticles.
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