Abstract
The effect of imposed pulsation on turbulent heat transport in fully developed turbulent pipe flow heated with a constant wall heat flux was investigated. Particular attention was paid to the condition where the pulsating frequency was slightly less than the bursting frequency. In this case, phase-averaged quantities such as the Nusselt. number and the relative correlation between velocity and temperature fluctuations show a substantial phase-lag to the pulsating flow field. Thus, the structural change in the heat transport mechanism takes place only when pulsation is imposed at a frequency smaller than the natural bursting frequency.
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