Abstract
ABSTRACT In the present study, flow and heat transfer characteristics of some yield stress nanofluid filled in a differentially heated square enclosure are investigated. The rheology of the fluid is modeled by regularized Bingham model. The effects of Rayleigh number in the range of 5 × 103 to 5 × 106, Bingham number between 0 and 2, nanoparticle volume fraction varying between 0% and 5% and Prandtl number ranging 5 to 100 on the natural convection of yield stress nanofluid has been investigated. The phenomenon is explained through velocity, temperature distribution and contour plots of streamlines and isotherms. The rate of thermal transportation through test fluids rises with an increase in Rayleigh number and volume fraction, while it falls as yield stress and Prandtl number is increased. Dependency of mean Nusselt number is more pronounced on nanoparticle addition, rather than its yield stress. A correlation of mean Nu has been proposed. All predicted values of mean Nu are obtained to be within ±13% band.
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