Heat transfer behind the backward-facing step under the influence of longitudinal pressure gradient

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.

Numerical simulation of flow dynamics and heat transfer in a rectangular channel with periodic ribs on one of the walls

“…The authors of [1,2] experimentally studied and numerically simulated the effect of a longitudinal pressure gradient on heat transfer on the lower wall of the channel. In accordance with data of [1], with an increase in the pressure gradient, the maximum heat transfer (indicated by the local value of the Nusselt number) increases for a converging channel and decreases for an expanding one. In this case, the position of the maximum heat transfer behaves in a similar way.…”