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
E-mail: ep.valueva@gmail.com
Keywords: heat transfer, pulsating laminar flow, flat channel, rectangular channels
Pages: 705–716
Abstract
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
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