Abstract
Characteristics of two-phase mist flow in a mist lift tube have been investigated both experimentally and theoretically. Hot water is sprayed upward into an evacuated vertical tube, the top of which is connected to a condenser. Since the top of the tube is cooled, vapor flashes from the sprayed droplets, which are entrained upward by the vapor flow. From measurements of vapor and droplets temperatures, it is clarified that initial flashing is accomplished rapidly. Variations of droplets' size and their velocities along the flow direction are also measured, and it is shown that the size of droplets increases rapidly due to their collision and coalescence. To predict the motion and the growth rate of the droplet, a theoretical model is proposed, in which the coalescence and collision-induced breakup of droplets are considered. When the turbulence in vapor flow is small, the calculated result agrees well with the experimental one.
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