Is a crisis in pool boiling actually a hydrodynamic phenomenon?

Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots

“…The sizes and the separation distances of vapour columns used in these two models also cannot be justified. As indicated by Yagov (Yagov, 2014), the experimental results reported by various researchers contradict the sizes and the separation distances of the vapour columns used in these two models. Many experimental visualizations (Ahn and Kim, 2012;Chu, No and Song, 2013;Chu et al, 2014) also clearly show that the vapour generated under high heat flux conditions (including the CHF condition) is encapsulated into large coalesced bubbles which repeatedly form and detach from the surface.…”

“…(El-Genk, Mohamed S.; Guo, 1993) (Brusstar, Matthew J.;Merte, 1994)). Yagov (Yagov, 2014) provided a comprehensive review of this group of models and concluded A C C E P T E D M A N U S C R I P T 5 that some of the critical assumptions could not be justified or were contradictory to the experimental observations.…”

“…Therefore, the CHF ( ) is equal to . Separate semi-empirical models for predicting and are used to calculate in different pressure regimes (Yagov, 2014).…”

Boiling Crisis Dynamics: Low Gravity Experiments at High Pressure

“…A consensus about the local nature of BC has begun to emerge. Contrary to previous idea of BC as being triggered by bulk hydrodynamic phenomena (Dhir 1998), the phenomena responsible for the BC are considered to act in a thin fluid layer adjacent to the heater (Nikolayev and Beysens 1999;Kandlikar 2001;Theofanous et al 2002;Nikolayev et al 2006;Chung and No 2007;Gong et al 2014;Jung et al 2014;Yagov 2014;Kannengieser et al 2014), down to the level of the triple (liquid-solid-vapor) contact. The accent is made on the growth dynamics of dry heater area.…”

“…Indeed, the theory of Janeček and Nikolayev (2014) is corroborated by Kannengieser et al (2014) who observed θ app ≈ 90 • at CHF at low pressures. Note that a nearly equivalent criterion (the equality of the radii of curvature of the bubble and of the dry spot) has been adopted by Yagov (2014).…”