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Thermophysics and Aeromechanics

2018 year, number 5

Hydrodynamics and heat transfer for large amplitude pulsating laminar flow in channels

E.P.В ValuevaВ andВ  M.S.В Purdin
National Research University Moscow Power Engineering Institute”, Moscow, Russia
Keywords: heat transfer, pulsating laminar flow, flat channel, rectangular channels
Pages: 705–716


The heat transfer at superposition of high-frequency oscillations on a laminar flow of a liquid in flat and rectangular channels at a distance from an inlet of a heated site is investigated under boundary conditions on channel walls of the first and second kind. For the flat channel, the obtained analytical expressions for the amplitude and phase profiles of the longitudinal velocity oscillations are used as a function of the dimensionless oscillation frequency in the form of functions of a real variable. It is shown that the mean value taken for the perimeter of the channel and also the period of oscillations, the Nusselt number for large amplitudes of mean velocity oscillations over the cross section can significantly exceed its stationary value. The limiting value of the ratio of Nusselt numbers for a pulsating and steady flow in the region of high pulsation frequencies is found.

DOI: 10.1134/S0869864318050074