Abstract
The present experimental work uses the rotary chamber technique to observe bubbles rising in oil in a levitated position. Sizes from 0.3 mm to 8 mm are covered. Main bubble gases are oxygen, nitrogen and argon. The oil is white oil. The focus of the investigation is on the mass transfer rate of the bubble gas into the undersaturated oil. Constituent quantities are the rise velocity and the bubble shape. While velocity and shape show a low-key behavior the transfer rates are unusual. The normalized mass transfer in terms of the Sherwood number exhibits three zones. Both, the large bubble and the small bubble zone obey Sh∝Ar1/3. However, they are substantially shifted with respect to each other and connected by a transition zone. From arguments concerning the bubble drag we conclude that large bubbles have a mobile interface which develops into an immobile one for the smaller bubbles. Thus the state of the interface affects the mass transfer rate heavily.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call