way
Strocture consiceracisns, but it is mone the less a useful: “toe-boli® far
applying scaling.
Such scalicg can de accomplished, once a rather arbirrary
diamecer to tbe boc Subble is assigned.
tazen.
For the 250,000-foot test a dizcer
This dimension seemed physically reasonable, since
Wit corresoods to Che outeraost range at which the temperature of tbe hizsh-
alcicude fireball compares with thar of the sea level fireball (6000 degrees
Kelvin).
4t 250,00) reece it was further assumed that the expected cloud rise
would be the same as that for a sea level fireball of the same diameter.
Using the curves given ion TM 23-200," the cloud rise can be predicted.
procedure predicts an evencual cloud rise
8 mimites.
in
This
a tine of aout
The initial rise welocity was expected to be abou
The previous cloud rise discussion could be termed conventional, siace
the prediction is based on sea level experience.
A LASL (J-10, T-5 Divisions)
calculation indicates that buoyanr lofring of debris shezld not occur, bar,
insteac, hydrodycasic forces should accomplish a auch core rapid elevation.
Physically, chis effecr should occur, since the pressure gradient is suddenly
increased sanyfold by beatics, whereas the density is unchanged.
LASL‘s
calcolation indicates that about 2 seconds after the bursr che debris should
achieve an upward welocity o
—
Particle size.
The last important parameter vhich needs to be consitered
for a sampler design is possible particle size.
Momentum analysis has s2z-
gested an early cloud diameter so large that the debris from the device is
widely dispersed.
Since chis dispersion is achieved while the gas is hot,
ict seems unlikely that significant particulation should occur.
On the other
hand, should rhe initial debris cloud be saall until ic is cooled, as suggested
by the other azalysis, considerable particulation, such as is exparienced in
lower elevation air bursts, could be expected.
From the uncertainty of par-
ticle size, it is apparent that the filtering arrangement should be able ta
sacple a large range of particle sizes down to molecules.
5.1.3
Filrer Desig for 250,000 Feet Altituce
Biowre SY deniers the tmescesr gcometzy.
Th2 air flow is deviated 5;
the ispactor vazes, enile particles, by virtue of their Larger inertia,
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