Influence of the wakes in bubble driven multiphase flow systems

✍ Scribed by J. Schmidt; R. Nassar; A. Lübbert

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 570 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(92)87050-z

✦ Synopsis

Local miring due to bubbles rising in a liquid medium has been investigated. It is shown that mixing in the bulk fluid is largely influenced by liquid transport in the bubble wake in conformity with experimental observations. A stochastic model has been developed to explain this bubble wake phenomenon. If miring over a small distance is considered, the model is in agreement with convective mixing (Levenspiel and Fitzgerald, 1983). At large distances the model becomes similar to the Taylor-A& dispersion model (Taykx 1953, 1954, Aris 1956). At intermediate scales, the dispersion of the standard deviation of a cloud of marked particles, as predicted from the model, becomes proportional to t's, where J3 assumes values in the interval y1 -z 0 4 1.