抄録
Jet impingement quenching as one of the most efficient cooling techniques has many practical applications. When
a liquid jet impinges on a hot surface beyond the homogeneous nucleation temperature, a stable wetted area remains on
a small stagnant region at an earlier time. Then the wetting area starts propagating outside at a particular velocity over
the hot surface after a specific resident time. In the present study, subcooled water jet quenching experiments on a hot
nickel disk were conducted to elucidate transient boiling transition between film and nucleate boiling regimes on the
wetting front, which was the tip of the wetted region. A local transient heat transfer was measured for different jet
velocities, jet subcoolings, and initial temperatures with a fast response thin-film thermocouple. Though the transient
local boiling heat transfer around the wetting front fluctuated highly and irregularly due to reputations of local wet and
dry at a dominant period of about 1 ms, time-averaged heat transfer characteristics agreed fairly well with the existing
correlations for steady-state pool boiling heat transfer, critical heat flux and single-phase convection.
