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LOCAL MEASUREMENTS OF INTERFACIAL AREA AND VOID FRACTION FOR UPWARD BUBBLY FLOW IN A LARGE DIAMETER PIPE

I. Gerges
Faculty of Engineering McMaster University Hamilton, Ontario, Canada L8S 4L7

Mamdouh Shoukri
McMaster University, Department of Mechanical Engineering, Hamilton, Ontario, Canada

I. Hassan
Faculty of Engineering McMaster University Hamilton, Ontario, Canada L8S 4L7

Abstrakt

The two-phase flow structure of an air-water, bubbly, upward flow in a 200 mm diameter pipe is presented with a particular emphasis on the local interfacial area concentration. The radial distribution of void fraction, bubble velocity, bubble size, bubble frequency and interfacial area concentration were measured using a local dual-optical probe. The experimental results showed that the saddle-type distribution of void fraction and interfacial area concentration, which are common in bubbly flow in small diameter pipes, only appeared in the present experiments under conditions of very low area-averaged void fraction (<ε> < 0.04). The interfacial area concentration in large diameter pipes showed higher values as compared with data obtained under the same flow conditions in small pipes.

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