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

Subcooled pool boiling of water on a downward-facing stainless steel disk in a gap

“…A number of experimental, theoretical, and numerical studies on boiling heat transfer have been performed since the incident (Phanikumar and Mahajan, 1998;Lallemand, 1998, 2001;Radziemska and Lewandowski, 2001;Yoon et al, 2001;Hetsroni et al, 2002;Nomura et al, 2002;Su et al, 2002a,b, Su andSugiyama, 2007;Kim and Jeong, 2006;Lee et al, 2007;Prakash Narayan et al, 2008). Many experiments (Yao and Chang, 1983;Nishigawa et al, 1984;Carrica et al, 1995;Glebov, 1995, 1996;El-genk and Gao, 1999;Yang et al, 1997;Kim and Suh, 2003;Lee et al, 2003;Kim et al, 2005 have demonstrated the differences in boiling heat transfer for vertical, inclined, and horizontal heated surfaces. The characteristics of heat transfer for upward-facing and downward-facing pool boiling on a horizontal heated surface are different because the vapor generated in boiling cannot readily move from the hot surface to depart from the edge of the downward-facing heated surface.…”

Two-phase flow instabilities of forced circulation at low pressure in a rectangular mini-channel

“…However, the LED region becomes narrow with increasing inlet subcooling. (3) As the highest heat flux is far lower than Kim's CHF data [34] in a rectangular mini-channel or the simulation results of other researchers, flow instabilities observed in our experiment are not accompanied by CHF. (4) Since the external forces play a dominant role compared with the interaction between bubbles and channel wall at low outlet quality, DWO I occurs.…”

“…Kim et al [34] have performed a CHF experiment under pool boiling in a rectangular channel with different gap sizes (1, 2, 5 and 10 mm) and different inclination angles (0-90°) and developed a semi-empirical CHF correlation. Zhang et al [35] developed a predictive model considering the surface orientation effects for CHF in rectangular narrow gaps.…”

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

“…Theofanous and Syri [11] and Howard and Mudawar [17] confirmed this point. Kim and Suh [18] found a transition angle for boiling in a gap, but a transition angle was not obvious for pool boiling. The present results in Fig.…”

“…Kim and Suh [18] conducted CHF experiments on a one-dimensional downward facing heated rectangular channel with gap sizes of 1, 2, 5 and 10 mm. The experiments also analyzed the effect of orientation on the CHF.…”