# Abstract

## On crisis of transition from nucleate to film boiling

L.G. Badratinova

Dinamika Sploshnoi Sredy, No. 1, 1996, pp. 1-31.

Language russian [russian]

It is shown that the formula by Kutateladze for the critical heat flux of nucleate boiling can
be obtained under the assumption that the boiling crisis occurs when the Reynolds number for vapor
outflow from the wall reaches a critical value. The Reynolds number is constructed with the help
of vapor outflow velocity V_{1} = q / ρ_{1} L, vapor viscosity ν_{1}
and a characteristic thickness of a viscous sublayer in a two-phase motion existing close to the wall
Δ = ρ_{1}^{½} ν_{1} [( ρ - ρ_{1}) g σ ]^{-¼}
(q and L are the heat flux at the wall and the latent heat of vaporization, ρ and ρ_{1} - the liquid and
vapor densities, g is the gravity acceleration and σ is the surface tension coefficient).
The formula for Δ is obtained from a study of model problems on stability of a thin equilibrium vapor
(or gas) layer located between the heated substrate (kept at a constant heat flux) and the liquid phase.