关键词: rising bubble;unsteady flow;velocity distribution;digital-image correlation method; stream function

Abstract: A model is presented for predicting the fluid velocity distribution around a rising bubble
which startsfrom rest on a distillation column tray by considering the unsteady fluid flow
based on the method of streamfunction. Experimental measurement of the velocity
distribution by using whole field digitized PIV (particle imagevelocimetry) method is
briefly described. The velocity distribution predicted by the present model is in
betteragreement with the measurements than the others models published in literature.

Key words: rising bubble, unsteady flow, velocity distribution, digital-image correlation method, stream function