Heat transfer of a tube bundle in a pulsating flow
V.M. Molochnikov, A.N. Mikheev, A.K. Aslaev, O.A. Dushina, A.A. Paereliy
Institute of Power Engineering and Advanced Technologies FRC RAS, Kazan, Russia
Keywords: пучок цилиндров, вынужденные пульсации скорости потока, теплоотдача, визуализация, SIV-измерения, профили статистических характеристик, механизм интенсификации теплоотдачи, cylinder bundle, forced pulsations of flow velocity, heat transfer, visualization, SIV measurements, profiles of steady-state characteristics, mechanism of heat transfer enhancement
Abstract
In the present paper, we report on the results of an experimental study of the transfer of heat and flow structure in the inter-tube space of in-line and staggered tube (cylinder) bundles in a pulsating external flow. For two values of the relative pitch in the bundles, the average heat transfer of a cylinder, and the distributions of the components of flow velocity and rms pulsations of that velocity in the inter-tube space, were measured. It is found that the change in the heat transfer of a bundle cylinder under forced flow unsteadiness correlates well with the level of the energy of velocity pulsations in the cylinder wake. The possibility of enhancement of heat transfer in a cylinder bundle using forced flow oscillations is demonstrated.
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