Accession Number : AD0757280

Title :   Vaporization of Thin Liquid Films.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : MacKenzie,Donald Kenneth

Report Date : DEC 1972

Pagination or Media Count : 90

Abstract : Experimental results are presented for saturated nucleate pool boiling of distilled water and ethyl-alcohol from 1-7/8 inch diameter Nickel disks with pool depths from 1.0 inch to a thin film of 0.015 inch. Experimental runs were conducted on a mirrorlike surface using distilled water and ethyl-alcohol; on a grooved surface with distilled water as the working fluid; and on a surface covered with 4 layers of Nickel 50 x 40 mesh with distilled water as the working fluid. Results show that liquid level has little effect on the heat transfer coefficient above a level of 0.2 inch on all three test surfaces; However, below 0.2 inch a rapid increase in the heat transfer coefficient occurs with the lowering of the liquid level. Two types of thin film dryout were noted on the mirrorlike surface: dryout under a dome and dryout in absence of a dome. A grooved surface appears to provide a means of obtaining a stable high heat transfer coefficient at liquid films as thin as 0.015 inch. (Author)

Descriptors :   (*NUCLEATE BOILING, *VAPORIZATION), (*HEAT EXCHANGERS, NUCLEATE BOILING), WATER, ETHANOLS, SURFACES, FILMS, NICKEL, THESES

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE