Abstract
Velocities of entrained droplet cluster were experimentally determined for vertical upward gasliquid annular mist flow. The velocities were measured using a set of optical sensers. In this study, system pressure in the closed-loop system was varied substantially from 5 to 15 MPa at constant fluid temperature. It was clarified that mean velocities of entrained droplet cluster draw near gas velocities under high pressure conditions. The correlation to predict the entrained droplet cluster velocity was presented. The correlation was applied to high pressure data and the droplet velocity, the entrainment holdup and the slip ratio of droplet were presented. The maximum value of entrainment holdup in gas core was 0.3.
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