Study on Migration Characteristics of Bubbles in Confined Channels based on Front-tracking Method
The formation and movement of bubbles greatly affects the safe operation of industrial equip-ment and its energy transfer efficiency.Migration characteristics of bubbles passing through confined channels were studied based on front-tracking method.The effect of channel structure on the flow field and bubble motion was investigated by changing the quantity,size and arrangement of the obstructions.The results show that decreasing the number of obstructions,the peak velocity of the bubble decreases by 5％in the case of symmetric layout,and increases by 193％in the case of staggered layout.Increasing the size of obstructions,the flow field becomes more disturbed,and the oscillation amplitude of the bub-ble trajectory increases.The bubble of medium size oscillates the most for symmetric layout.As for two bubbles in front-behind layout,disturbance in flow field caused by the upstream bubble hinders the downstream bubble.The peak velocity in front-behind layout increases by 22.6％compared to that in the side-by-side layout.
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