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

摘要

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 degrees 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 degrees inclination angle as the heated surface faced downward. Boiling behavior at -30 degrees inclination angle under static condition was similar to that under rolling motion when the rolling platform rolled counter-clockwise at the angle between -23 degrees and -27 degrees, where CHF occurs. (C) 2020 Elsevier Ltd. All rights reserved.