Effect of Microbubble Cluster on Turbulent Flow Structure

Wall shearing stress is decreased by the existence of microbubbles in a turbulent boundary layer as discovered by McCormick and Bhattacharyya [1] in 1973. Since that time experimental research has been conducted on air-water bubble flow [2]-[7]. It has been demonstrated that shearing stress is decreased to a value one order of magnitude lower than the original value under optimum conditions [2].