Abstract
Abstract The heat transfer problem of flow in a pipe with turbulence promoters on the inside watt has been studied from the standpoint of heat transfer augmentation. Little attention has been given to unsteady flow phenomena in channels with turbulence promoters. In this paper, the periodically oscillating unsteady turbulent flow in a channel with turbulence promoters, which is controlled by the Coanda effect due to fluid injection from the top of the promoters, is studied experimentally. First, the flow control by the Coanda effect is examined for two different promoters and the optimum operating condition is determined. Then the variation of the mean and fluctuating velocity components with space and time is obtained using the conditional sampling technique. The peaks of turbulent intensity correspond well to the gradients of the mean velocity profiles, even in the transient state of the flow oscillation. The heat transfer coefficient for the unsteady flow is constant in the flow direction and slightly ...
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