Spherical capped gas bubbles rising in aqueous media

✍ Scribed by R.I.L. Guthrie; A.V. Bradshaw

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 985 KB
• Volume: 28
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(73)85100-0

✦ Synopsis

The rising velocity of spherical capped bubbles in water and in PVA solutions, showed the viscosity to have little influence below 2P. Solutions with high viscosities caused some retardation especially with smaller bubbles.

Measurements of the mass transfer coefficient during the absorption of CO* from bubbles rising in water gave similar values to those obtained during the desorption of CO2 from saturated solutions into inert bubbles which had been formed under mercury to prevent premature transfer. Instantaneous values of the ma8s transfer coefficient from CO% bubbles into water and PVA solutions were found to decay as the bubble rose in the column. The rate of decay was especially rapid when small amounts of PVA were dissolved in water and this effect was probably due to the influence of surfactants.

A qualitative study was also carried out on the. shapes of wakes behind spherical cap bubbles and on the exchange between the liquid in the wake and the surroundings.