An Empirical Modification of Nucleation Theory and Its Application to Boiling Heat Transfer Page: 24 of 38
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o Test Points of Piret-Isbin
- Calculated for Vigorous Boiling
.1= 1-LT I
I I I I I I
c= 0.5 x 1061Y
coef = 0.2 x 10-4
20 40 60 8010
n-butyl Alcohol -
20 40 60 80 10
SUPERHEAT 9s, of
Fig. 9. Heat Flux versus Superheat for Boiling
in Vertical Copper Tube
--o Test Points of Jordan- Leppert -
-- - Calculated for Vigorous Boiling -
_ -- Calculated for Feeble Boiling
Metu - Terphelyl - - - - Dphenyl - --- Ortno- Terphenyl-----
20 50 100
SUPERHEAT 65, oF
Fig. 10. Heat Flux versus Superheat for Boiling
Contamination of the surface reduces the effective superheat due
to the temperature drop across the contaminated film. Three sets of test
data as recorded by Mesler-Banchero at different date are reproduced in
Fig. 11. These data can be accurately predicted by Eq. (23) provided that
the effective superheat is used for calculation and the nominal superheat
for plotting the curves. Alternatively, proper choice of values of C and n
will also yield the correct results without knowing the effective superheat.
20 50 00
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Chang, Y. P. An Empirical Modification of Nucleation Theory and Its Application to Boiling Heat Transfer, report, February 1, 1961; United States. (https://digital.library.unt.edu/ark:/67531/metadc863296/m1/24/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.