Experimental Study on Shape and Rise Velocity of Small Bubbles in Stagnant Water


A Mitra,P Bhattacharya,S Mukhopadhyay,K K Dhar,




Bubble,Rise Velocity,Stagnant Water,Shape,


This paper presents the results of an experimental study on the shape andrise velocityof small bubbles risingin stagnant water. Bubbles, generated at the bottom of the chamberholding water, rise through it.A high speed camera (1000 fps, Kodak, Model 1000 HRC)together with a 90 mm Macro lens is placed at a height of 60 cm from the bottom of thechamber. It is linked with a PC. The commercial software Sigma Scan Pro 5.0 and AdobePhotoshop are used for image capturing and processing.Bubbles(diametersin the range0.0245-5.903 cm)aregenerated at the bottom of the chamber holding the water. We find thatbubbles have threesteady shapes, a sphere,an ellipsoidandspherical capin this diameterrange.The experimentally determined rise velocity of bubble in the present investigationagrees well with the data available in the literature


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Author(s) : A Mitra, P Bhattacharya, S Mukhopadhyay, K K Dhar View Download