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ANP PROJECT PROGRESS REPORT
Experimental transient wall and fluid temper-
ature data are shown in Fig. 4.1.10 in terms of the
total temperature fluctuation divided by the axial
temperature rise of the fluid going through the
core. The frequencies of the temperature fluctu-
ations for this one-half-scale volume-heat-source
system vary from about \ to 4 cps. The frequency
range of temperature fluctuations in the full-scale
ART system operating with fluoride fuel should be
similar to that in the one-half-scale volume-heat-
I ISLANDSHELLATEQUATOR I I
+OUTER GORE SHELL AT EQUATOR -4
0 4.0 2.0 3.0
TIME (sec)
source system in which an acid was circulated.
The frequencies of the temperature fluctuations
were found to be in agreement with the frequencies
of the velocity fluctuations observed in the full-
scale core madel used for flow studies,
The results of a study- of the temperature
structure in an idealized ART core were presented
in the previous report.8 The increase in the
'H. F. Poppandiek and L. D. Palmer, ANP Quur.
Prog. Rep. March 10, 1956. p 176.
HELICAL Re = 256,000
6wucF
ORNL-LR-DWG 44742
W=s (UNIFORM)
At, = TOTAL CHANGE IN WALL TEMPERATURE
At,,, = AXIAL FLUID TEMPERATURE RISE IN
GOING THROUGH CORE
Fig. 4.1.10. Transient Surface and Fluid Temperatures Obtained for ART Core Model with a Uniform 7
Volume Heat Source.
2 26
.
t
.