ORNL-1771 - Oak Ridge National Laboratory

ANP QUARTERLY PROGRESS REPORT
TEMPERATURE DIFFERENTIAL, 159.2OF
REYNOLDS NO. AT 13OO0F, 3730
REYNOLDS NO. AT 1459"F, 4540
FLOW, 0.81 gprn
VELOCITY, 5.29 fps
MASS FLOW RATE, 0.361 Iblsec
LENGTH OF HEATING SECTION, 5.13 ft
LENGTH OF COOLING SECTION, 5.86 ft
POWER, 17.6 kw
CURRENT, 400 amp
VOLTAGE, 44
HEATING SECTION
1
ORNL - LR -DWG 3097
0.02 5 -in. WALL
INCONEL TUBING
Fig. 3.5. Configuration and Design Conditions for lnconel Forced-Circulation Loop to Operate at a
Temperature Differential of Approximately 16OOF.
A summary of the design dimensions and expected
operating conditions for each of the six loops is
presented in Table 3.1, which also indicates the
current status of each loop. Three methods of
heating were studied: electr ical-res i stance, gas-
fired furnace, and liquid bath. The liquid bath
was discounted because it would require pres-
surization of the liquid rneta1,an excessively long
heat exchanger,and a large investment. A gas-
fired furnace was considered, but lack of operating
experience and the high heat flux necessary for
the loops indicated the use of electrical heating,
with which considerable experience has been ob-
tained. A gas-fired furnace is being studied as a
possible heat source for a large number of cor-
rosion loops. Preliminary calculations of the
pressure drop through the loops indicate that the
40
Model LFA pump8 can be used, and thus it will
not be necessary to develop a pump.
For purposes of preliminary design the following
assumptions were made: (1) The specific resis-
tivity of molten NaF-ZrF,-UF, (50-46-4 mole %)
is so high that the resistance of the electrically
heated lnconel tube may be taken as the parallel
circuit re~istance.~ (2) Heat transfer to the
fluoride mixture may be calculated by relations
established for water." (3) A thermal loss equal
'W. 6. McDonald et al., ANP Quar. Prog. Rep. Mar.
10, 1954, ORNL-1692, p 15.
n
'A. L. Southern, personal communication.
'OD. F. Salmon, Turbulent Heat Transfer from a
Molten Fluoride Salt Mixture to NaK in a Double Tube
Heat Exchanger, ORNL-1716 (to be issued).