TRANSIENT BOILING FROM INCLINED AND DOWNWARD-FACING SURFACES IN A SATURATED POOL

Quenching experiments investigating transient pool boiling from the underside of inclined and downward-facing flat surfaces in saturated water were performed. Inclination angles investigated are 0-degrees (downward facing), 5-degrees, 10-degrees, 15-degrees, 30-degrees. 45-degrees and 90-degrees (vertical). While transition boiling heat flux and both q(CHF) and q(min), and the corresponding wall superheats increased as the inclination angle was increased, nucleate boiling heat flux decreased. The values of q(CHF) and q(min) and the corresponding wall superheats are correlated as functions of the inclination angle. In addition, the steady-state q(CHF) data of other investigators for saturated helium and nitrogen are correlated as a function of inclination angle. These correlations are compared with that for water to determine the effects of the type of the boiling liquid and heating method on q(CHF).