Slip velocity measurements in an upward bubbly flow by combined LDA and electrodiffusional techniques |
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Authors: | O N Kashinsky L S Timkin |
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Institution: | (1) Institute of Thermophysics, Pr. Lavrentyeva, 1, 630090 Novosibirsk, Russia, RU |
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Abstract: | An experimental technique for the measurement of the local slip velocity of spherical bubbles is reported. It is based on
the measurement of the local liquid velocity by an electrodiffusional method, and the bubble velocity by a specially adapted
LDA (Laser Doppler anemometer) with a short measuring volume. The bubble velocity is measured taking into account the shift
between the bubble centre and the centre of the LDA measuring volume. The slip velocity is obtained by subtracting the liquid
velocity from the bubble velocity at the point corresponding to the bubble centre. The technique is applicable for flows with
high velocity gradients. Results of the slip velocity measurements in an upward bubbly flow at laminar pipe Reynolds numbers
are presented.
Received: 25 July 1996/Accepted: 13 April 1998 |
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