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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i4.40
13 pages

GAS BUBBLE SIZE AND VELOCITY MEASUREMENTS USING HIGH-SPEED IMAGES OF GAS-LIQUID FLOWS

John Hiscock
Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada
Chan Y. Ching
Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S4L7, Canada

ABSTRACT

A quantitative flow visualization system has been developed to measure gas bubble size and velocities of gas-liquid flows. The images are acquired using a high-speed digital imaging system. An image processing algorithm based on standard edge-detection routines and morphological operations are used to demarcate the boundaries of the gas bubbles and obtain the bubble size distribution. The displacement of the bubbles between two consecutive frames is obtained through a cross-correlation analysis between the frames. Results obtained from the flow visualization and image analysis techniques are in good agreement with simultaneous measurements using hot-film anemometry.


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