Effect of orienting the hot surface with respect to the gravitational field on the critical nucleate boiling of a liquid

HFE-7100 pool boiling heat transfer and critical heat flux in inclined narrow spaces

“…In the past, some authors also analysed the effect of surface orientation on pool boiling CHF: Vishnev (1974), El Genk and Guo (1993), Chang and You (1996), Brusstar and Merte (1994) and Priarone (2005). All these correlations are based on Zuber's relation and multiply the correlation for q ¼ 0 by an expression function of the orientation angle.…”

Effect of surface orientation on nucleate boiling and critical heat flux of dielectric fluids

“…Vishnev [28] was the first to correlate the effects of orientation on normalized CHF in pool boiling: Fig. 7 compares experimental data with those yielded by various correlations: the Vishnev correlation (10) and the Chang and You [11] correlation: CHF/CHF max = 1.0 − 0.00120θ tan(0.414θ) − 0.122 sin(0.318θ) (11) and the Brusstar and Merte [29] correlation, which takes into consideration the sliding effect of bubbles on inclined downward-facing surfaces and is valid only for angles from 90 • to 180 • :…”

One-dimensional critical heat flux concerning surface orientation and gap size effects

“…Numerous other pool boiling CHF studies examined the orientation effect, and in general these investigations found that the CHF decreases as orientation changes from upward-facing horizontal (0 • ) to vertical (90 • ) to downward-facing horizontal (180 • ). Vishnev (1974) was the first to correlate the effect of orientation on the pool boiling CHF, whose correlation is still the most widely used. Nishikawa et al (1984) performed nucleate boiling experiments with a copper plate with the angle varying from 0 • (upward) to 175 • (inclined downward).…”