Correlation between Velocities and Wall Shear Stresses in the Bursting under Favorable Pressure Gradients

Abstract

The velocities and the wall shear stresses are respectively measured with a hot-wire and a hot -film gage embedded in a wall. The sensors are operated by the constant temperature anemometer Iso-cross-correlation curves between the velocity and the wall shear stress averaged over a short time period of the bursting process and over a long time period are obtained from experimental data. The shapes of those curves become flatter and more elongated stream wise as pressure gradient is decreased to a negative value. It is concluded that the bursting under the favorable pressure gradients tends to be restricted near the wall in the scale of the wall coordinate.