Study on propagative collapse of a vapor film in film boiling (mechanism of vapor-film collapse at wall temperature above the thermodynamic limit of liquid superheat)

Jet impingement quenching phenomena for hot surfaces well above the limiting temperature for solid–liquid contact

“…Even though the surface temperature during the early stages is well above the thermodynamic limiting temperature (T max ) that allows solidliquid contact [8], the jet impacts the surface by the hydrodynamic forces and bounces immediately because of possible vapor formation during the brief contact making the surface dry again. Some amount of heat is transferred during these events of wet and dry which may continue at different frequencies until the surface temperature becomes equal to a certain temperature such as T max and a sustainable solid-liquid contact may be established.…”

“…Ohtake and Koizumi [8] studied the mechanism of vapor-film collapse at the wall temperature above the spinodal limit (T tls ). They pointed out that local solid surface temperature at the position of solid-liquid contact could never exceed the T tls or the spontaneous homogeneous nucleation temperature (T shn ) even if the vapor-film collapse occurred at a high wall-superheat.…”

The film boiling reactor: A new environment for chemical processing

“…To establish a vapor film, it is necessary that T w > T m . Various models15–19 for T m result in values in the range of 400 to 500 K for methanol, independent of the transport situation for the fluid (such as models that assume T m is the same as the limit of superheat of a fluid).…”

Experimental study of the heat transfer of single-jet impingement cooling onto a large heated plate near industrial conditions

“…However, this should be physically impossible as water cannot exist in the liquid state above the spinodal temperature, which means solid-liquid contact is impossible at this interface temperature, as attested by recent experimental studies using optical techniques with jet impingement [33] and droplet impact onto hot surfaces [32,34]. Ohtake and Koizumi [35] also reported in 2004 with film boiling experiments using a thin platinum wire that the vapor film cannot collapse while the interface temperature exceeds a maximum value related to the thermodynamic limit. Despite this contraction, we still find several studies reporting rewetting temperatures substantially higher than the spinodal temperature, as those presented in Table 1.…”