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

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

“…Recently El-Genk and Bostanci (2002) analysed the saturated boiling of HFE-7100 on a smooth, 10 Â 10 mm copper surface; Priarone et al (2004) and Priarone (2005) compared boiling heat transfer performances of FC-72 and HFE-7100 dielectric fluids on varying the orientation angle of a smooth copper surface (30 mm diameter). The results obtained confirmed some of the effects reported in the literature: in the low heat flux nucleate boiling region, the heat transfer coefficient increases markedly with the orientation angle; for higher heat flux values, the effect of orientation is evident only for angles greater than 90 , and the heat transfer coefficient diminishes as the angle increases.…”

“…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.…”

Experimental study of saturated pool boiling from downward facing surfaces with artificial cavities

“…Priarone [19] experimentally analyzed the effect of inclination angle on the nucleate boiling of FC-72 and HFE-7100 from a smooth copper surface for inclination angles from 5°to 180°. The results indicated that the heat transfer coefficient increased significantly as the inclination angle decreased in the low heat flux boiling region with the CHF decreasing rapidly as the inclination angle decreased towards 0°, the CHF data were correlated as a function of inclination angle as:…”

Saturation Boiling Critical Heat Flux of PF-5060 Dielectric Liquid on Microporous Copper Surfaces

“…For these as well as other applications, determining CHF is a needed input to the design and operation of the heat transfer equipment. The uncertainties associated with determining CHF, which could be as much as 10-20% [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], are partially due to the methods used in the experiments by different investigators for determining CHF.…”