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TABLE 13.3. VAPOR PRESSURE OF NaZpF,
. TEMPERATURE T S U U S E R Y I _ D PRESSURE
(mm Hg)
795
803
807
835
a3 5
854
a58
8 68
886
887
923
946
9 48
9 64
9 67
994
8
a
8
13
14
16
18
20
28
27
39
47
50
64
63
90
-I_
measurements of UF4.(l0) These data
are in fair agreement with the values
(39 and 94 mm Hg) obtained by the
Rodebush method.(g) In addition,
tentative values for this compound,
29 mm Hg at 751°C and 56 mm Hg at
786”C, obtained by using a capillary
’‘ b r i d ge ” app a r a t u s , c 11.12)
agree
fairly well with the values of 26 and
59mm Hg obtained by using the Rodebush
method.
In the past quarter, vapor-pressure
data obtained by applying a trans-
piration method to beryllium fluoride
were reported by Battelle Memorial
Institute. 13) A comparison of the
data from Battelle with values calcu-
lated from the equation reported by
this Laboratory(14) is given in
(l0)K. 0. Johnson, The Vapor Pressure of
Uranium Tetrafluoride, Y-42 (Oct. 20, 1947).
(ll)C. G. Maier. Vapor Pressures of the Common
Metallic Chlorides and a Static Method for High
Temperatures. U.S. Bureau of Mines, TP-360.
‘l2)D. W. Yuhn, A. D. Ryon. and A. A. Palko,
The Vapor Pressures of Zirconium Tetrachloride
and Hafnium Tetrachloride, Y-552 (Jan. 17, 1950).
(I3)K. A. Sense, M. J. Snyder, and J. W.
Prog. Rep. Sept. 1952, BMI-772, p. 46.
Clegg,
(14)R. E. Moore, ANP Quar. Prog. Rep. June 10,
1952, ORNL-1294, p. 15L
PERIOD ENDING DECEMBER 10, 1952
Table 13.4. The two sets of values
are probably in agreement, within the
experimental errors of both methods.
TABLE 13.4. COMPARISON OF VAPOR
PRESSURE OF BeF, BY DIFFERENT METHODS
____
BMI Data
1.25
7.25
23.5
51.0
Hg)
ORNL Data
2.7
8.8
24
47
___..____I
CONVECTIVE HEAT TRANSFER IN
FLUBBIDE MIXTURE NaF-KF-LiF
H. W. Hoffman J. Lones
Reactor Experiment a1 Engineering
Division
The construction and instrumentation
of the experimental system for the
de t erm i n a t i on of conve c ti ve he at
transfer coefficients for the fluoride
mixture NaF-KF-LiF (11.5-42.0-46.5
mole %) have been completed. This
system is a modification of the one
used for obtaining heat transfer
coefficients in a tube with molten
sodium hydroxide in turbulent flow. (I5)
All system components, with the
exception of the test section, have
been constructed of Inconel; A nickel
tubing was used for the test section.
Swagelok connections and “0” ring
flanges have replaced the all-welded
construction of the sodium hydroxide
system.
The heat loss calibration and five
heat transfer runs with NaF-KF-LiF
were made. These runs covered a
Reynold’s modulus range of 2000 to
6000. Figure 13.3 presents the data
for NaF-KF-LiF compared with data for
air that were obtained by various
(15)H. W. Hoffman and J. Lones, ANP Quar.
Prog. Rep. Sept. 10, 1952, OWL-1375, p. 148.
179