The measurements of velocity distribution and reattachment length are reported downstream of a single Backward-Facing step mounted in a two-dimensional channel.
A Laser-Doppler Velocimetry was employed to define quantitatively the variation of separa...
The measurements of velocity distribution and reattachment length are reported downstream of a single Backward-Facing step mounted in a two-dimensional channel.
A Laser-Doppler Velocimetry was employed to define quantitatively the variation of separation length with Reynolds number and to obtain detailed information of the velocity profiles downstream of the step. Results are presented for laminar flow of air in a Reynolds-number range of 100<Re<1400.
The experimental results show that laminar regimes of the flow is characterized by a reattachment length that increases with Reynolds-number.
Although the high aspect ratio of the test section ensured that the oncoming flow was fully developed and two-dimensional, the experiments showed that the flow downstream of the step only remained two-dimensional at low Reynolds-numbers.