Experimental investigation of heat transfer in the separation zone behind a backward-facing step in presence of tabs
A.Yu. Dyachenko1, V.L. Zhdanov2, Ya.I. Smulskii1, V.I. Terekhov1
1Kutateladzer Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Lykov Institute of Heat and Mass Transfer NASB, Minsk, Belarus
Keywords: турбулентный поток, отрывное течение, табы, обратный уступ, теплообмен, turbulent flow, separation flow, tabs, backward-facing step, heat transfer
Abstract
The paper presents the experimental data on distribution of static pressure and heat transfer in a separation zone behind a backward-facing step equipped with vortex generators. The size and gaps between generators (tabs) of rectangular shape were varied in experiments. Experimental results were compared with two limiting cases: a smooth step (no tabs), and a step with a solid fin. The strongest influence on flow and heat transfer from the set of installed tabs was observed within the recirculation zone just behind the step base. The tabs allocated at the step edge resulted in the displacement of the Nusselt number maximum to the step base that caused the enhancement of a local and average heat transfer.
|
