Experimental study of critical heat flux mechanism on a vertical heated surface under rolling motion

Experiments were performed to understand the critical heat flux (CHF) mechanism on a vertical heated surface under rolling motion. The maximum rolling amplitude and periods were set to 30° and 10 and 30 s, respectively. Because of the rolling motion, there are two additional accelerations on the working fluid: centrifugal and tangential. When the platform rolled clockwise or counter-clockwise, combination of tangential acceleration and inclined surface has significant effects on boiling. When the platform rolled faster, early CHF occurred at a higher tangential acceleration. Boiling behaviors on the heated surface under the rolling conditions were compared with those under static conditions. Under static conditions, early CHF occurred at -30° inclination angle as the heated surface faced downward. Boiling behavior at -30° inclination angle under static condition was similar to that under rolling motion when the rolling platform rolled counter-clockwise at the angle between -23° and -27°, where CHF occurs.