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    The effect of bubble release techniques on their behaviour at the initial stages of rise

    Year: 2012

    Journal: Mineral engineering 2012, 36-38 pp 254-261, 20121211

    Authors: Z. Jávor, N. Schreithofer, K. Heiskanen

    Organizations: Aalto University School of Science and Technology, Department of Materials Science and Engineering, Research Group for Mechanical Process Technology and Recycling,P.O. Box 16200, FI00076 Aalto, Finland, Aalto University School of Chemical Technology, Research Unit of Mechanical Process Technology and Recycling, P.O. Box 16200, FI00076 Aalto, Finland

    In this research we focus on the differences caused by the experimental conditions in bubble rise tests atthe initial phases of motion in Dowfroth 200, Nasfroth 240 and Dowfroth 250 solutions. Two bubblerelease techniques were used and the first 50 ms of the rise were recorded with high-speed camera.The results suggest that the method of bubble release strongly influences the behaviour of bubbles. Theextent of surface deformation caused by different bubble release techniques effect on form drag andtherefore the bubble rise velocity due to the different surface stabilization capabilities of frothers.