Accuracy of bubble velocity measurement with a four-point optical fibre probe


Bai, Wei and Deen, Niels G. and Mudde, Robert F. and Kuipers, J.A.M. (2008) Accuracy of bubble velocity measurement with a four-point optical fibre probe. In: 6th International Conference on Computational Fluid Dynamics in the Oil & Gas, Metallurgical and Process Industries, CFD 2008, 10-12 June 2008, Trondheim, Norway.

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Abstract:For the operation of high void fraction bubbly flows in bubble
columns, insight in primary parameters such as bubble size,
shape and velocity as well as gas volume fraction is essential.
At high gas volume fractions the flow system becomes
opaque, ruling out non-intrusive optical techniques. As an
alternative optical fibre probes can be used, which have the
advantage of low cost, simplicity of setup and easy
interpretation of the results.
By using four-point optical fibre probe, properties of bubbles
can be studied, such as bubble velocity, bubble size, etc.
However, the effect of bubble wobbling behaviour and
physical properties of liquids on the accuracy of the velocity
measurements has not been investigated in detail.
In the present study, the performance of a four-point optical
fibre probe was evaluated for five different liquids. The probe
performance and causes of inaccuracies are discusse
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