The terminal rise velocity of 10-100 microm diameter bubbles in water.
Single bubbles of very pure N2, He, air and CO2 were formed in a quiescent environment in ultra-clean water, with diameters ranging from 10 to 100 mum. Their terminal rise velocities were measured by high-speed video microscopy. For N2, He and air, excellent agreement with the Hadamard-Rybczynski (H-R) equation was observed, indicating that slip was occurring at the liquid-vapor interface. For CO2 bubbles with diameters less than 60 microm, the terminal rise velocities exceeded those predicted by the H-R equation. This effect was ascribed to the enhanced solubility of CO2 compared with the other gases examined. The presence of a diffusion boundary layer may be responsible for the increased terminal velocity of very small CO2 bubbles.
Parkinson
Luke
L
Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
Sedev
Rossen
R
Fornasiero
Daniel
D
Ralston
John
J
D000327:Adsorption; D000388:Air; D002245:Carbon Dioxide; D004058:Diffusion; D005740:Gases; D006371:Helium; D008853:Microscopy; D009584:Nitrogen; D012995:Solubility; D013499:Surface Properties; D014835:Volatilization; D014867:Water / Q000737:chemistry*
D005740:Gases; D014867:Water; D002245:Carbon Dioxide; D006371:Helium; D009584:Nitrogen