Affiliations: Department of Mechanical Engineering, Fukui
University, Bunkyo, 3-9-1, Fukui 910-8507, Japan | Department of Mechanical Engineering, The University
of Tokyo, Hongo 7-3-1, Tokyo 113-8656, Japan
Abstract: Overall, as well as individual, bubble behavior of a plane bubble
plume which is confined by two parallel plates is investigated by means of
several qualitative and quantitative flow visualization methods. These include
observation, measurement of time-averaged void distribution, surface tufts and
particle imaging velocimetry. Several kinds of unstable motion of the bubble
convection, which depend on the free surface initial height and on the gas flow
rate, are observed. The bubble motion along the bubble plume is precisely
measured by an image-processing method which also delivers velocity vectors,
number density and size of the bubbles.
