Abstract
In this report, the effects of Reynolds number to the bubble-bubble interaction in a swarm of wall-sliding bubbles are investigated experimentally using PTV (Particle Tracking Velocimetry). Firstly, the drag coefficient of single wall-sliding bubble is measured for four kinds of liquid with different kinematic viscosity and is then compared to single bubble in an infinite liquid. Secondly, the difference of the bubble-bubble interaction among three types of Reynolds numbers, i.e. Re = 1.32, 2.83 and 15.42 is clarified using statistic data such as the interactive velocity vectors, the drag coefficient ratio and the presence frequency of the nearest bubbles. In particular, the discussion is focused on how the vorticity diffusion from the target bubble affects the nearest bubble.
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