On the Solution of a Periodic Internal Laminar Flow

Comparison of time-resolved heat transfer characteristics between laminar and turbulent convection with unsteady flow temperatures

“…The results showed that the instantaneous Nusselt number becomes highly time-dependent under higher flow temperature frequency and the quasi-steady approach is inadequate. Other studies on the transient conjugated convection of a laminar steady flow with time varying temperature can be found in [6][7][8][9][10][11]. Those studies solved the problem with analytical or numerical methods, and the behavior of periodic responses, including amplitudes and phase lags of oscillations in the wall temperature, flow bulk temperature and heat flux, was described.…”