PTV MEASUREMENT OF MIXING FLOW IN A CYLINDRICAL BATH WITH A BOTTOM BLOWING BUBBLING JET

Abstract

A binary correlation method with a high speed algorithm for the particle tracking velocimetry (PTV) is applied to the measurement of mixing gas-liquid two phase flows in a cylindricall bath with a bottom blowing bubbling jet. By analyzing a series of pictures of moving particles and bubbles in the water bath, flow patterns, instantaneous velocity distribution, time mean velocity distribution, velocity fluctuation and rising velocity of bubbles are obtained. It is made clear that the mixing flow is agitated by the bubbling jet and that the fluctuation of the mixing flow is governed by the rising bubbles and the unsteady vortex in the upper part of the bath.