FLUID FLOW AND HEAT TRANSFER CHARACTERISTICS OF NATURAL CONVECTION IN SQUARE NANOFLUID-FILLED ENCLOSURES SATURATED POROUS MEDIA DUE TO DISCRETE SOURCE-SINKS PAIR

摘要

Steady natural convection heat transfer behavior of nanofluids is investigated numerically inside a square enclosure filled with a porous medium. The flush mounted heater with finite size is placed on the bottom wall as well as two sinks with finite size are placed on the vertical walls, whereas the rest walls are adiabatic. The governing equations are obtained based on the Darcy's law with the nanofluid model. The transformed dimensionless governing equations were solved by finite difference approach. The influence of governing parameters, namely, Rayleigh number, location and geometry of the heat source, the type of nanofluid and solid volume fraction of nanoparticles on the cooling performance is studied. The present results are validated by favorable comparisons with previously published results. The results of the problem are presented in graphical and tabular forms and discussed.