Natural convection heat transfer enhancement using nanofluid and time-variant temperature on the square enclosure with diagonally constructed twin adiabatic blocks

摘要

A finite difference based two dimensional numerical investigation of laminar natural convection inside the closed square enclosure filled with copper-water nanofluid and two diagonally placed adiabatic blocks is presented by vorticity-stream function approach. The left and right walls are assumed as hot and the top wall is kept as cold. The temperature of bottom wall varies sinusoidal over time. The variables considered in the present study are Rayleigh number (104 to 106), volumetric fraction of copper particles (0 < phi <4%), amplitude (0< a <0.5) and the period (0.001