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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-518-9

5th Thermal and Fluids Engineering Conference (TFEC)
April, 5-8, 2020, New Orleans, LA, USA

ACHIEVING HEAT FLUX UNIFORMITY OVER A HEATED FLAT PLATE SUBJECTED TO PARALLEL FLOW USING AN OPTIMAL ARRANGEMENT ARRAY OF TURBULATORS

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DOI: 10.1615/TFEC2020.hte.033560

Abstract

In this study, uniform heat flux distribution over part of an isothermal flat plate is achieved by using optimal arrangements of circular-shaped or wedge-shaped turbulators, positioned in a cross-flow arrangement. Coordinates of these turbulators in the two-dimensional space constitute six geometric design variables. The Reynolds number is the other independent design variable. The objective is to achieve a predetermined uniform heat flux or convective heat transfer coefficient (i.e., Nusselt number) along the plate. The root-mean-square deviation of the heat flux from the "design" uniform distribution at discrete locations is taken as the objective function in the optimization process, which is minimized by the pattern search method. Optimization process is subject to some geometric constraints. For three different desired design heat flux distributions, an optimal combination of design variables as well as the required inlet velocity have been found. In all these cases, circular shaped turbulators show superior performance, although for low values of design heat flux, the contrast between circular shaped and wedge shaped turbulators is more profound.