Abstract
An experimental study is conducted to measure liquid-solid (L-S) contacts in film boiling of water under atmospheric pressure. The test specimens selected for the present experiments are a silver sphere (30 mm in diameter) and two kinds of silver cylinders (20 mm in diameter and 60 mm long). The heat transfer surface is coated with a thin, electrically insulating layer, and the impedance between the metal substrate and the boiling liquid is measured. This impedance is related to the average fraction of the heat transfer area which is wetted by the liquid. Direct L-S contacts are intermittently observed on local portions of the heated surface in saturated film boiling, and the frequency of contact ranges between 1.0 and 3.1 Hz. In subcooled boiling, however, the contact frequency becomes extremely low with a little subcooling.
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