Turbulent pulsating flow driven convective heat transfer in the quasi-steady and low frequency regimes

The instantaneous and time-averaged dynamics of single-phase internal convective flows, driven by turbulent pulsating pipe flows is investigated experimentally over a parameter range in the quasi-steady and low frequency regimes. The heat transfer in steady flow increases with Reynolds number at a steeper rate compared to heat transfer in pulsating case. Therefore, time-averaged Nusselt number (Nu) in pulsating case is lower relative to time-averaged Nu in steady case. Also, time-averaged Nu increases with Reynolds number non-monotonically. The general observation is that, in the turbulent pulsating pipe flows, in the quasi-steady and low frequency regimes, the time-averaged heat transfer marginally increases with pulsation frequency. However, compared to steady flows, heat transfer marginally decreases.