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THE EFFECT OF LIQUID PHYSICAL PROPERTIES ON DRIFT VELOCITY

Chen Yuanming~* (Dept. of Chem. Eng., Trianjin University, 300072, Tianjin) Bell K. and Kottowski H.M. (Joint Research Centre, Commission of The European Communities, Italy)  
Drift velocity is a very important paramcter for predictirg the pool volumetric void fraction. Two-phase system of gas and high viscous liquids pool is encountered in various engineering applications. A review of the literature shows no data for explaining the effect of highly viscous liquids on the drift velocity. This paper's analysis shows that there is a considerable influence. It is shown that the foaming behaviour of liquids is dependent on the surface properties. For some highly viscous liquids at a given superficial gas velocity, the viscosity changes with time. The effect of "foam" and "time" on drift velocity is clearly elucidated.
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