Abstract
Gas holdup was obtained in a gas-liquid upflow bubble column using quick-closing valve technique. Coaxially placed string of spheres is the promoter internal. An electrolyte solution of ferri-ferro redox couple was the liquid phase and nitrogen was the gas phase. Using promoter the gas holdup obtained was about 22 percent more. The influence of liquid velocity and rod diameter on gas holdup was found to be negligible. The gas holdup increased with gas velocity, pitch and sphere diameter. A correlation equation is obtained for the prediction of gas holdup as a function of Reynolds number and Froude number.
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