An Empirical Modification of Nucleation Theory and Its Application to Boiling Heat Transfer Page: 30 of 38
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for feeble boiling without and with forced convection of ordinary liquids
and of liquid metals, respectively.
At vigorous boiling, E/a >> 1, so that the term unity in Eqs. (28),
(29) and (30) can be neglected and these equations reduce to Eq. (21).
Accordingly,the eddy thermal diffusivity can be determined for each
( I= const.
Lpcp6sNA(K Ts) 0 (X, y)
kGO H(GrLPr)13 J
Lpc 9sNA(KTs)3/z $(X, Y)
kosRe Pr 3H
for pool and forced convection boiling, respectively, and
Lpc 0NA(/T) 0(X,Y)
kG Pe1 a1/z
for forced convection boiling of liquid metals.
0 Test Points, Water, Lyon et at.
x Test Points, Mercury, 0.02%6Mg,
0.0001% Ti, Lyon et al.
--Calculated for Vigorous Boiling
--- Calculated for Feeble Boiling
SUPERHEAT 9s, oF
Fig. 16. Heat Flux versus Superheat for
Boiling of Mercury from Stain-
Calculated values of heat
transfer from Eq. (28) checks
well with test data of Jakob(29)
for saturated pool boiling of
water from a stainless steel
plate, as shown in Fig. 15. Cal-
culation from Eq. (29) has also
been made for subcooled forced
convection boiling of water in an
annulus as used in the experi-
ments of McAdams,(21) which
is reproduced in Fig. 16. Note
that the curves are displaced
along the abscissa for each
subcooling by values of the
temperature difference corre-
sponding to the difference in
subcooling. This phenomenon
is consistent with McAdams'
Curves of feeble boiling
for other liquids from different
surfaces can be similarly calcu-
lated as shown by the dotted
lines in Figs. 3 to 15.
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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/m1/30/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.