Bubble size effect on low liquid input drift-flux parameters |
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Authors: | S. Guet G. Ooms R.F. Mudde |
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Affiliation: | a Laboratory for Aero- and Hydrodynamics, Leeghwaterstraat 21, J.M. Burgerscentrum, Delft University of Technology, 2628 CA Delft, The Netherlands b Kramers Laboratorium, Prins Bernhardlaan 6, 2628 BW Delft, The Netherlands |
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Abstract: | We investigated the effect of bubble size on the drift-flux parameters at low liquid flow conditions by measuring the radial profiles of void fraction and phase velocities in a vertical bubbly pipe flow of diameter and height . To study the effect of the bubble size we used two different types of bubble inlets. We measured the local bubble fraction and velocity Ug by using single and four-point-optical fibre probes, and we used Laser Doppler Anemometry to determine the liquid velocity Ul. The distribution parameter C0 and the weighted mean drift velocity |Udrift| were directly computed from the local measurements at a height on our experimental set-up. Both parameters were influenced by the bubble size. Provided no liquid flow reversal occurred at the near wall region, the distribution parameter reached a below unity minimum plateau value of C0=0.95 for wall peaking void fraction profiles. At low liquid input conditions both the liquid input and bubble size had an influence on the distribution parameter. Extreme values such as C0>2 were measured. From these measurements we developed models for the drift-flux parameters to take into account the effect of bubble size and input-flow conditions for our intermediate pipe diameter value. These models were tested and validated with separately collected experimental data. |
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Keywords: | Multiphase flow Hydrodynamics Void fraction Gas-lift Bubble size Drift-flux parameters |
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