Vaporization of thin liquid films

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Author
MacKenzie, Donald Kenneth
Date
1972-12Advisor
Marto, Paul J.
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Show full item recordAbstract
Experimental results are presented for saturated
nucleate pool boiling of distilled water and ethyl-alcohol
from 1-7/8" 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 utilizing 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.
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