Accession Number : AD0826627

Title :   NUCLEATE POOL BOILING OF NITROGEN FROM ARTIFICIAL CAVITIES.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Moulson, John Alfred

Report Date : SEP 1967

Pagination or Media Count : 84

Abstract : Pool boiling heat transfer of nitrogen from artificial cavities was investigated. Boiling was from circular, one-inch diameter horizontal mirror finished copper plates. The single artificial cavity surfaces investigated were: a drilled 0.0043 inch diameter hole, a drilled 0.015 inch diameter hole, an 0.022 inch diameter spark cut cone, and an 0.006 inch diameter spark cut cylindrical hole. The multiple cavity surfaces investigated were: seven 0.015 inch diameter drilled holes, thirteen 0.015 inch diameter drilled holes, and ninety-seven 0.003 to 0.0045 inch diameter spark cut holes. The depth to diameter ratio was about 2.5 for all drilled cavities. The data from a mirror finished surface was compared to that of previous investigations. Exponents for Yamagata's Equation for boiling in the isolated bubble region were determined. The artificial cavities were found to affect the natural convection heat transfer. The size of the cavity appeared to have little effect after incipience of boiling, and larger cavities than previously expected were found to remain active. (Author)

Descriptors :   *NUCLEATE BOILING), (*CRYOGENICS, LIQUEFIED GASES), (*NITROGEN, BUBBLES, CONVECTION(HEAT TRANSFER), HYSTERESIS, SURFACE PROPERTIES, CYLINDRICAL BODIES, BOUNDARY LAYER, HEAT FLUX, HEAT TRANSFER COEFFICIENTS, THERMOCOUPLES.

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE