Heat transfer in the flow with forced pulsations in a rib-roughened channel

Abstract

Heat transfer in pulsating air flow in a rib-roughened channel has been studied experimentally. Heat transfer was estimated using the technique of simultaneous wall heating and wall temperature measurement by the same copper tracks. Distributions of heat transfer coefficient over the channel wall in steady and pulsating regimes of flow have been obtained. 30% augmentation of heat transfer compared with the steady flow values has been revealed in pulsating flow. The frequency range of (0-100) Hz and the relative amplitude of forced velocity pulsations of 0.3 have been studied.