Weekly progress report -- Technical Section for period ending June 12, 1943 Page: 8 of 17
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. K. ;z-z=ms (Conttd.) -
low Zr- of 3.0 lbs. of water/sec. It has also been shown that
this - air causes a decrease of only about 1% in the amount
:f wa =- --loving through the pressure reduction nozzles and that
:he c-_-- -al flow velocity for the air:water mixture is at
..eas t ~= 4 times as large as the desired flow velocity in
she nc- .
Fl:w :zf Water in the Bowed Pile
=he s + of the flow of water in the bowed pile has been completed
1nd a - randum written. As stated in last week's report, there
are sC--- =l egg and ring slugs 'extending from the inner edge of
.e t=- l out to 8 inches beyond the outer edge of the biological
hie l c= undersized dummy slugs in the reflector portion of the
,ube aE- &.so replacing the active slugs removed to effect shorter
.ctive- =-inders. For the dummy slugs, the frictional pressure
rop f- _-..7% and the kinetic pressure drop 23% that of an equal
engt. - regular slugs. The total pressure drop for the egg and
.ng g = was assumed to be 20% that of an equal length of
egula- mugs. Calculations were made for five different tubes,
ne osie _--rom each length tube that is nearest the center of the
ile ar- -ence with the greatest heat load of tubes of that par-
icula- --mgth. For the case of the tubes with minimum clearance
omple-. . pressure drop vs. flow rate curves were obtained, this
being - limiting case for both the boiling disease and exit water
empern- e for nominal flows. In addition, results were obtained
the -==we of tubes with nominal clearance for only non-boiling
Dndiz -~. The inlet water temperature to the central tube was
ssumecz --:: be 5'C., and 20 0. water was arbitrarily assumed to
tart ;--- the first tube from the center of greater length than
.ae cez--.l tube.
..its ,r-esults were as follows:
(1) =--imum inlet header pressure to suppress boiling
=- maximum pressure drop for the boiling cases was 150 lbs./
in. for the central tube, and for suppression of boiling
-inlet header pressure of 200 lbs./sq. in gage is recommended.
(2) -t cooling water temperature
maximum exit water temperature was 68.50C. from the
--st tube out from the center, i.e., the first tube to
- - ch 20*C. water is added. This exit temperature was
--= - the flow rate resulting from the use of a nozzle picked
as to give a 650C. exit temperature from the central tube.
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Weekly progress report -- Technical Section for period ending June 12, 1943, report, June 15, 1943; United States. (https://digital.library.unt.edu/ark:/67531/metadc1354792/m1/8/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.