ACOUSTICAL MEASUREMENT OF INCIPIENT BOILING (thesis)
A method for the experimental determination of the time to inception of subcooled nucleate boiling was developed. It consists of measuring the time between the initiation of an electrical heating step in a thin foil (or wire) and the acoustical disturbance caused by boiling on the heated surface. Tests made for steady-state pool boiling (from a single nucleating site), step-transient pool boiling, and step-transient boiling in an enclosed capsule verified the method. Heat flexes varied from 2.2 x 10/sup 4/ to 161 x 10/sup 4/ eter copper wire and 0.002-inch thick zirconium and stainless steel ribbons. To measure the time to incipient boiling, high speed motion pictures of the bubble growth and the oscilloscope trace from the bubble noise were taken simultaneously on the same film. An electronic scaler was used to measure boiling inception times for steptransient pool boiling on copper wire and stainless steel foil heating surfaces for three bath temperatures and a broad range of heat fluxes. (auth)
- Research Organization:
- California. Univ., Berkeley. Inst. of Engineering Research
- DOE Contract Number:
- AT(11-1)-34
- NSA Number:
- NSA-18-000403
- OSTI ID:
- 4160419
- Report Number(s):
- SAN-1006; NE-63-1
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- United States
- Language:
- English
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