| Abstract: | We investigate the transient film boiling in the vicinity of a stagnation point on the frontal surface of a very hot blunt
body which moves with a constant velocity in an incompressible viscous fluid in the presence of a vapor layer near the body
surface. Within the unsteady two-phase boundary layer approximation, the equations of motion of the liquid and vapor phases
are formulatedwith account of the conservation of mass, momentum, and energy on the a priori unknown phase interface. In the
vicinity of the stagnation point on the body surface, the solution of the boundary layer equations is sought in the form of
series in the longitudinal coordinate. For the leading terms of the series, a parabolic system of partial differential equations
is obtained, which is solved numerically. The similarity parameters controlling the film boiling process are determined. On
the basis of parametric numerical calculations, the dynamics of the vapor layer are investigated for the case of a plane hot
body moving in water with the room pressure and temperature. In the space of governing parameters, the limits of the existence
of steady and unsteady film boiling regimes are found. |
