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Hot spot in a horizontal annulus is moderated by using a single as well as double fins. The annular space confined between two concentric horizontal cylinders is filled with air and the fins are attached (inward) to the outer cylinder. The internal cylinder is subjected to heat flux boundary condition, and the maximum temperature on its surface (i.e., the hot spot) is taken as the objective function, which is to be minimized by placement of inward fins in the outer surface in an optimal manner. The objective function is minimized using a hybrid Genetic algorithm and Pattern search method with the circumferential locations and the lengths of the fins taken as the design variables. Optimal positioning of a single fin reduced the hot spot temperature considerably. Adding another fin lowered the hot spot temperature even further. Interestingly, in both cases the heat transfer enhancement and the optimal locations and dimensions of the fins are found to be independent of the Rayleigh number.

DIMINISHING THE HEAT TRANSFER HOT SPOT EFFECT IN A HORIZONTAL ANNULUS USING OPTIMAL POSITIONING OF FINS