Abstract
Results of an experimental and numerical study of the flow structure and turbulent heat transfer in a rectangular channel with longitudinal pressure gradient behind the backward-facing step. With the channel expansion the angle of rotation of the upper wall is 1.43; 2.86 and 4°, and with the channel convergence the rotation angle is 3; 5.7 and 7.6°. Experiments are carried out at Reynolds numbers, calculated on the step height and velocity in front of the backward-facing step, Re H = 4 000; 8 000; 12 000. It was determined, with the increase of pressure gradient the maximum value of Nusselt number increases for the converging channel and decreases for the expanding channel.
Highlights
This study focuses on the properties of a separated flow behind the backward-facing step under conditions of imposed longitudinal pressure gradient
To further improve the efficiency of thermal power equipment and to develop the fundamentals of separated flows it is crucial to conduct comprehensive experimental and computational studies of new opportunities of intensification of heat and mass transfer in the separation gradient flows behind the backward-facing step
This report contains the results of an experimental study of the separated flow behind the backwardfacing step in a flat channel with flow acceleration and deceleration
Summary
This study focuses on the properties of a separated flow behind the backward-facing step under conditions of imposed longitudinal pressure gradient. To further improve the efficiency of thermal power equipment and to develop the fundamentals of separated flows it is crucial to conduct comprehensive experimental and computational studies of new opportunities of intensification of heat and mass transfer in the separation gradient flows behind the backward-facing step.
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