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

被引：4
|
作者：
Valueva, E. P. [1 ]
Purdin, M. S. [1 ]
机构：
[1] Natl Res Univ, Moscow Power Engn Inst, Moscow, Russia
来源：
THERMOPHYSICS AND AEROMECHANICS | 2018年 / 25卷 / 05期
关键词：
heat transfer; pulsating laminar flow; flat channel; rectangular channels; BOUNDARY-CONDITION; PIPE FLOWS;
D O I：
10.1134/S0869864318050074
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
The heat transfer at superposition of high-frequency oscillations on a laminar flow of a liquid in flat and rectan-gular 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 signifi-cantly 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.
引用
收藏
页码：705 / 716
页数：12
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