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Received August 9, 2011
Accepted September 15, 2011
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Generation of uniform small bubbles and hydrodynamic characterization of a bubble column with high pressure jet sparger
1Department of Chemical Engineering, Indian Institute of Technology, Kharaghpur-721302, South Africa 2School of Chemical Engineering, Howard College, University of Kwazulu-Natal, King George Avenue, Durban 4041, South Africa
meikap@ukzn.ac.za
Korean Journal of Chemical Engineering, June 2012, 29(6), 724-730(7), 10.1007/s11814-011-0242-y
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Abstract
Systems generating uniform small bubbles are used in many mineral processing and chemical operations. We investigated the generation of smaller bubbles by using a two fluid jet system. Gas holdup results are reported in terms of the effect of superficial gas and liquid velocities in relation to the pressure in a bubble column with a water jet sparger. Experiments were conducted with hydrostatic head of 80 cm, 100 cm, and 120 cm in the bubble column. The gas velocity varied from 0.122 to 1.22 cm/s, and water flow rate from 33.3 to 333 cm3/s. Experiments were conducted at pressures of 2 atms., 3 atms. 4 atms. and 5 atms., and bubble sizes were measured by a digital camera (bubble compared to a reference wire inside the bubble column). Results show that the gas holdup increases with the pressure and superficial gas velocities; and at pressures of 2, 3, 4 and 5 atms., the gas holdup increases by 8.75%, 9.166%, 10% and 10%, respectively. The maximum gas holdup of 16.4% was observed at a liquid level of 80 cm and pressure of 4 atms. Optimum conditions for generating smaller bubbles with larger gas holdup are increased liquid flow rate, low liquid level, and high gas pressure. Experimental results also indicate that the column operates in both the homogeneous and heterogeneous regimes of gas-liquid flow.
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