H205 EVALUATION OF RELATIVE VELOCITY BETWEEN SINGLE BUBBLES AND LIQUID IN HORIZONTAL TURBULENT PIPE FLOW(Bubble behavior)

概要

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Many numerical methods have been proposed to predict void distributions in gas-liquid two-phase bubbly flows. For the equation of bubble motion, there is, however, no definite opinion for the treatment of pressure gradient induced by frictional loss. In order to examine the influence of frictional pressure gradient on the migration of single bubbles, we measured bubble trajectories in a horizontal turbulent pipe flow under high Reynolds number conditions. As a result, it was experimentally confirmed that there is a difference in the axial velocity between the single bubbles and the liquid. Numerical simulations using a one-way bubble tracking method with an effective body acceleration model were also carried out to examine the external forces inducing the relative velocity. It was found that frictional pressure gradients accelerate single bubbles in the flow direction, and that virtual mass force plays a role in accelerating and decelerating single bubbles.
一般社団法人日本機械学会の論文
2000-10-01