A PHOTOGRAPHIC INVESTIGATION OF BUBBLE NUCLEATION CHARACTERISTICS.

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Abstract:

The characteristics of bubble nucleation, growth, and departure during nucleate boiling were investigated. The liquid-vapor interface motion was analyzed using high speed motion picture photography. The fluids used were distilled water, water with wetting agent, water with sucrose, ethanol, and freon-11. Cylindrical, conical, and reentrant cavity geometries were employed in addition to J, L, and I shaped capillaries. Cavity inner diameters were fixed at 0.085 centimeters and cavity depth ranged from 0.230 to 0.703 centimeters. Consistent results were obtained for geometrically similar cavities and for the same cavity at different occasions. A thin liquid film was observed on the cavity inner wall which was directly related to cavity nucleation stability. The liquid-vapor interface penetration was shown to be dependent upon cavity geometry and fluid properties. Frequency, but not penetration, was affected by heat flux and superheat. Author

Author(s):
Sowersby, Roger Lee
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
Descriptive Note:
Master's thesis,
Pagination:
0067

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*NUCLEATION, *NUCLEATE BOILING, BUBBLES, FLOW VISUALIZATION, INTERFACES, TWO PHASE FLOW, WATER, SURFACE ACTIVE SUBSTANCES, SUCROSE, ETHANOLS, FLUORINATED HYDROCARBONS, CONICAL BODIES, FILMS, THESES
Field(s)/Group(s):
Fluid Mechanics, Thermodynamics
Report Date:
1969 Dec 01