Author(s): Bao-Shi Shiau

Linked Author(s):

Keywords: Digital image; Stratified; Bubble plume

Abstract: In this paper, digital image processing technique is applied to analyze and study the mixing of bubble plume in a two-layer stratified fluid. Experiments were conducted in a water tank. The image of bubble plume in the stratified fluid was taken by the CCD (Charged Couple Detector) and digitized and stored in the hard disk. The digital image processing technique was employed to analyze and investigate the characteristic behavior of the bubble plume. The width of the bubble plume is wider as the initial gas flow rate increases. In the meanwhile, the mixing efficiency is larger when the initial gas flow rate increases. The density difference increases, the inhibition on the upward motion for the bubble plume becomes stronger. For larger density difference case, the width of the bubble plume is wider than for the smaller density difference case. As the density difference of the two layers decreases, the barrier effect on the bubble plume is also decreases. Therefore, the rising height of intrusion increases. The mixing efficiency has semi-log relationship with intrusion number. And the semi-log relation prevails for different initial gas flow rate cases.

DOI:

Year: 1999