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on air radiations and simulated flat-
duct systems is being made. A solution
is sought that will suitably correlate
the nonisothermal heat transfer
results of air radiator tests being
conducted by the ANP Division.
NATURAL CONVECTION IN CONFINED SPACES
ANI) ~~~~~~A~ LOOP SYSTElB
D. C. Hamilton F. E. Lynch
L. D. Palmer
Reactor Experimental Engineering
Division
Temperature profiles have been
measured in the flat- late naturalc
o n ve c t i o n a p p a r a t u s ?=) over the
practical range of variables atLainable
with the present equipment. The data
w i l l be presented in a forthconiing
ORNI, report and w i l l be analyzed in
relation to the theory prrviously
developed. An example of a typical
experimental temperature profile is
given in Fig. 13.4.
The annulus , natural-convection
apparatus is ready to be operated,
(22)D. C. Hamilton and F. E. Lynch, ANP Quar.
Prag. Rep. June 10. 1952, OWL-1294, p. 158.
182
__
LEFT CENTERi-INE RIGHT
WALL WALL
except for construction of the two
thermocouple assemblies, After ~hp:
flat-plate data have been analyzed,
the annulus experiments w i l l be
started. The test section shown in
Fig, 13.5 was described in detail
previously.(23) The test section has
been assembled and installed in a
20-in,-'IO can, and the car1 w i l l be
sealed and maintained at a slight
vacuum to prevent mercury vapor from
leaking into the room during operation.
In the pyrex model of a thermal
harp, shown in Fig. 13.6, the tube has
an inside diameter of 16 mm and the
over- all height of the apparatus is
30 inches;. The temperature differ-
ential between the hot and cold legs
is provided by running hot and cold
water through the condenser tubes.
The natural-convection velocity of
the water in the inner tube is measured
by observing the motion of small
particles. The data PLOY, being obtained
with this appzratus w i l l provide a
means of checking the validity of
analytical mcthods of predicting harp
vc loci ti e s.
TURBULENT CONVECTION IN A ~ ~ ~ ~
W. B. Harrison J. 0. Gradfute
Reactor Experiment a1 Engineering
Divisi-on
Relatively li~tle sa~isfactory
information on turbulent -flow, forced -
convection, heat transfer in annulus
systems is available in the literature.
( 2 4 ) However, a significant
number of momentum transfer studies
have been reported, (25) and invcstigation
has been initiated in an attempt
to derive a heat-momenium transfer
analogy for the annulus in much the
(23)D. C. Hasilton and F. E. Lynch, ANP Qaur.
Prog. Rep. Sept. 10, 1952, ORNL-1375, p. 149.
(24)H. C. Claiborne, A Reulew of the Literature
on lieut Transfer in Annuli and Noncircular Ducts
for Ordinary Fluids and Liquid Metals, ORNL
CF-52-8-166.
(25)H. C. Claiborne, Critrcnl Review of the
Literature on Pressure Drop in Noncircular Ducts
and Annulr. ORML-1248 (May 6, 1952).