TY - JOUR
TI - Mass transfer control of a backward-facing step flow by local forcing-effect of Reynolds number
AU - Mehrez Zouhaier
AU - Bouterra Mourad
AU - El Cafsi Afif
AU - Belghith Ali
AU - Le Quere Patrick
JN - Thermal Science
PY - 2011
VL - 15
IS - 2
SP - 367
EP - 378
PT - Article
AB - The control of fluid mechanics and mass transfer in separated and reattaching  flow over a backward-facing step by a local forcing, is studied using Large  Eddy Simulation (LES). To control the flow, the local forcing is realized by  a sinusoidal oscillating jet at the step edge. The Reynolds number is varied  in the range 10000 ≤ Re ≤ 50000 and the Schmidt number is fixed at 1. The  found results show that the flow structure is modified and the local mass  transfer is enhanced by the applied forcing. The observed changes depend on  the Reynolds number and vary with the frequency and amplitude of the local  forcing. For the all Reynolds numbers, the largest recirculation zone size  reduction is obtained at the optimum forcing frequency St = 0.25. At this  frequency the local mass transfer enhancement attains the maximum.