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A Study on the Effect ofNozzle Type on the Hydrodynamics of Ejector-Induced Cocurrent Upflow Bubble Column

Rahman, Fauzan (2008) A Study on the Effect ofNozzle Type on the Hydrodynamics of Ejector-Induced Cocurrent Upflow Bubble Column. Masters thesis, Universiti Teknologi Petronas.

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Bubble columns as gas-liquid cocurrent contactors have gained a considerable attention due to various advantages they offer. The effectiveness of gas distributors in the bubble columns determines the mass transfer efficiency of the column. Ejector is one of the most widely used devices as the gas distributors in the bubble columns. Although empirical correlations for the ejectors have been reported in literature, no study based on the principle of fluid mechanics has been carried out on the effect of ejector geometry on its important hydrodynamic characteristics. A better understanding of the ejectors is essential for an improved design of the ejector itself and the bubble column. In the present work, the experimental setup consists of an ejector integrated with upflow bubble column and a gas-liquid separator at the top of the column. Experimental investigations have been carried out on the effect of ejector nozzle geometry on the hydrodynamics of cocurrent upflow bubble column. Gas entrainment rate, gas hold-up, pressure drop and energy dissipation for water-air system are studied and reported. Experiments have been conducted using convergent and orifice nozzles with different types and sizes. It is found experimentally that nozzle with smaller nozzle diameter develops higher vacuum and entrains more air as the suction fluid, for a given flow rate of water as the motive fluid. This also means that nozzle with smaller nozzle diameter gives higher gas hold-up and dissipates more energy to create intense mixing between the two phases. In terms of nozzle type, orifice nozzles present higher vacuum level than convergent nozzles for the same nozzle diameter. The pressure drop across the nozzle and the air entrainment rate have been modeled and analyzed by applying Bernoulli's principle. Predicted values of air entrainment rate as a function of water flow rate through the nozzle by the theoretical model developed show good agreementwith experimental values. Gas hold-up data has also been analyzed using drift flux model. The analysis agrees well with the previous works.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Chemical Engineering - Process Safety
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 08 Nov 2013 11:36
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/10339

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