Hydrodynamics and heat-transfer aspects of subcooled film boiling on a vertical surface
Natural-convection film boiling of subcooled water is studied. Wall heat fluxes from a vertical heater 6.3 cm wide and 10.3 cm high were measured during subcooled film boiling of water at atmospheric pressure. The wall heat flux and the wall temperatures were measured with thermocouples embedded in a copper block one face of which served as the heated wall. For subcooled film boiling, present experiments show that predictions of wall heat flux from theoretical models that assume a smooth vapor-liquid interface are inadequate and a detailed consideration of the vapor-liquid interface behavior is required. Still photographs and video pictures of the vapor film taken from the front and the side showed the existence of a finite vapor layer at the leading edge and the existence of ripples and large bulges on the interface. The ripples and the large bulges are spatially and temporally periodic structures on the interface and are termed waves in this work although there is no proof that they are indeed waves. The amplitude and the wavelength of the waves were measured. Interface and liquid velocities near the leading edge of the vertical wall were measured during subcooled film boiling.
- Research Organization:
- California Univ., Los Angeles, CA (United States)
- OSTI ID:
- 5395268
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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