Abstract
A substantial improvement in forced-convection heat-transfer conductance is required for the development of advanced steam-cooled and gas-cooled power reactor systems. Boundary-layer turbulence promoters on the heated surfaces are of great interest for these systems because of the large increase in the heat-transfer performance which can be attained. However, much of the experimental data on turbulence promoters has been obtained in annular flow passages, and it is necessary to transform these data in order to apply them to reactor configurations. This investigation of boundary-layer turbulence promoter performance was carried out in arrays of parallel rods, the configuration of greatest interest for engineering applications. Discrete two-dimensional roughness elements, in the form of small fins transverse to the flow, were investigated experimentally to establish the effect of promoter height and promoter spacing. The results are directly applicable for optimization of heat-transfer performance, and also provide a basis for evaluating transformation techniques used for data obtained in annular passages.
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