Application of Numerical Optimization to Design of Angled Ribs to Enhance Turbulent Heat Transfer

초록

A numerical procedure for optimizing the shape of three-dimensional channel with angled ribs extruded on both walls to enhance turbulent heat transfer is presented. The response surface based optimization is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer. Shear stress transport (SST) turbulence model is used as a turbulence closure. Four dimensionless variables such as, rib pitch-to-rib height ratio, rib height-to-channel height ratio, streamwise rib distance on opposite walls to rib height ratio and attack angle of the rib are chosen as design variables. The objective function is defined as a linear combination of heat-transfer and friction-loss related terms with weighting factor. D-optimal method is used to determine the data points as a means of design of experiment. Optimal values of the design variables have been obtained in the range from 0.0 to 0.1 of the weighting factor.