Graduate Thesis Or Dissertation
 

Gas absorption by entrainment from a plunging, liquid jet

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  • The gas absorption due to the entrainment effect of a plunging, liquid, turbulent jet was studied. The chemical system of carbon dioxide and water was chosen to expand the limited work already done in this field. The effects of jet diameter, jet Reynolds number, jet Weber number, jet length and liquid pool depth were studied and an equation was developed to predict the concentration of dissolved carbon dioxide in the liquid pool. Jet diameters of 0.00775 feet to 0.0233 feet were studied. It was found that the amount of carbon dioxide absorbed in the pool increased as the jet diameter decreased. Jet Reynolds numbers of 7,000 to 11,000 and Weber numbers of 103 to 614 were investigated. This range allowed the study of both limited entrainment and large amounts of entrainment. The concentration of dissolved gas was found to increase for any given jet diameter as the jet Reynolds number and Weber number increased. Jet lengths of one to five inches were studied. The effect of jet length was found to be negligible for turbulent, well defined, liquid jets. Pool depths of three to eight inches were analyzed. The concentration of absorbed gas increased as the pool depth or pool volume decreased. The concentration of dissolved gas in the liquid pool was found to be uniform throughout the pool at any given time for all jet systems studied. An equation was developed to predict the pool concentration based on the knowledge that the liquid pool was well mixed and that the Reynolds and Weber numbers were the important groups involved in the jet entrainment effect. The equation is C[subscript A] = (AN[subscript W][superscript F]ρ[subscript g]+[superscript 0.102]/[subscript Q[subscript]L]) (1-exp(-[superscript Q[subscript L]]/[subscript V[subscript L]]t)) The above equation predicts concentrations which are within 10% of most of the data.
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