title: The terminal rise velocity of 10-100 microm diameter bubbles in water.
abstract: 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.
authors.affiliation: Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
authors.forename: Luke
authors.initials: L
authors.lastname: Parkinson
authors.forename: Rossen
authors.initials: R
authors.lastname: Sedev
authors.forename: Daniel
authors.initials: D
authors.lastname: Fornasiero
authors.forename: John
authors.initials: J
authors.lastname: Ralston
mesh_terms: 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*
chemical_list: D005740:Gases; D014867:Water; D002245:Carbon Dioxide; D006371:Helium; D009584:Nitrogen