Graduate Thesis Or Dissertation
 

Pool absorption of gas entrained by a plunging liquid jet

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  • A mathematical model was developed to predict the absorption rate of a slightly soluble gas entrained by a plunging liquid jet. The single parameter of the model, the transfer factor, TF, was defined as the summation of the product of the mass transfer coefficient and interfacial area over all the entrained bubbles. The concept of transfer factor reduced the mathematical description of the process to a tractable as well as representative form. The model was successfully applied to experimental data from present and previous studies of the entrainment of a gas in aqueous systems. Values of TF as a function of the jet stream characteristics were determined for three gases. The transfer factor was found to be proportional to the product of jet Weber number and. Reynolds number. The magnitude of TF was determined to be inversely proportional to the gas solubility as predicted by interphase mass transfer theory. Results suggested that the entrainment process exceeds the performance of most commercial absorbers when compared on the basis of gas absorbed/unit energy. The results of the present study indicate 3.77 mg 0₂ absorbed/joule when absorbing pure oxygen gas in oxygen-free water from bubbles entrained by a plunging liquid jet. Specifically, oxygen, nitrogen, and carbon dioxide were entrained by a plunging water jet and absorbed in a pool of water. Circular, coherent jet streams varying from 1.4 to 6.8 mm OD at flow rates equivalent to a jet Reynolds number varying from 4,000 to 20,000 were used. The rate of gas absorption was calculated from the time rate of change of the pool concentration determined from gas chromatographic analyses of pool samples at various time periods. The experimentally determined absorption rates were used to calculate the values of the single parameter of the mathematical model, TF.
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