Accession Number : AD0487412

Title :   AN EXPERIMENTAL INVESTIGATION OF THE EFFECT OF SURFACE CONDITIONS ON NUCLEATE POOL BOILING HEAT TRANSFER TO LIQUID NITROGEN FROM A HORIZONTAL SURFACE.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Maynard, Michael Damon

Report Date : MAY 1966

Pagination or Media Count : 86

Abstract : A system was designed to investigate experimentally the mechanism of nucleate pool boiling heat transfer using commercial grade liquid nitrogen as a working fluid. A circular horizontal flat plate five square centimeters in area was utilized as a boiler surface. The effect of various surface parameters on the characteristic heat flux versus (Tw-Ts) curve at atmospheric conditions was determined. Surfaces used included a highly polished mirror surface, a mirror surface coated with oxide, a mirror surface coated with grease, a roughened surface, and a roughened surface coated with Teflon, all fabricated from commercial electrical tough pitch copper. The final surface used was a Nickel 200 highly polished mirror surface. The data from the copper surface with a mirror finish was in agreement with the data of previous investigations. The effects of roughness, contaminants, hysteresis, and boiler surface material were discussed. A comparison was made on incipient boiling heat fluxes. The results indicate that the surface conditions play a major role in nucleate pool boiling heat transfer to liquid nitrogen.

Descriptors :   (*NUCLEATE BOILING, SURFACE PROPERTIES), (*NITROGEN, NUCLEATE BOILING), CRYOGENICS, HEAT TRANSFER, FLAT PLATE MODELS, HEAT FLUX, MIRRORS, OXIDES, COATINGS, GREASES, ROUGHNESS, HALOCARBON PLASTICS, PLASTIC COATINGS, COPPER, COMPUTER PROGRAMMING, NICKEL, CONTAMINATION, HYSTERESIS, METAL PLATES, TEMPERATURE, SURFACE TEMPERATURE, HIGH SPEED PHOTOGRAPHY, TEST METHODS, BUBBLES, THERMAL DIFFUSION, HEAT TRANSFER COEFFICIENTS, EXPERIMENTAL DATA.

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE