CIA-RDP96-00787R000500130048-3

Approved For Release 2001/03/26 : CIA-RDP96-00787R000500130048-3
2216422
J PRS
80259
ELECTRICITY AND MAGNETISM
8 MAR 82
STRONG SCATTERING OF PARTICLES IN RANDOMLY INHOMOGENEOUS MAGNETIC FIELD
Moscow ZHURNAL EKSPERIMENTAL'NOY I TEORETICHESKOY FIZIKI in Russian
Vol 81,. No 5(11), Nov 81 (manuscript received 7 May 81) pp 1723-1730
NL
DUC
YAYINSHTEYN, S. I. and KICHATINOV, L. L., Institute of Terrestrial Magnetism.
the Ionosphere and Radio Wave Propagation, Siberian Department. USSR Academy
of Sciences
1117206
[ Abstract] A kinetic equation is derived that describes propagation of charged
particles in an electromagnetic field with random inhomogeneities in intense
scattering. The formulated problem is analogous to the theory of strong
scattering of electromagnetic waves, and to the problem of hydrodynamic turbulence,
where there is no small parameter. Solution of the problem is based on Orszag's
approach [ see S. A. Orszag, JOURNAL OF FLUID MECHANICS, Vol 41, 1970, p 363],
which yields the Kolmogorov spectrum in hydrodynamic turbulence theory. At the
weak scattering limit, the derived equation is automatically transformed to pre-
viously found results. The proposed method improves on Orszag's scheme in the
:act that an equation is derived for the memory time of the system t, rather
than merely assigning this parameter. The proposed kinetic equation is valid
even when the particle scattering angle on the correlation length of the
Lignetic field is not small. An examination is made of the diffusion approxi-
ation with consideration of particle acceleration by a stochastic electric
:feld. References 12:
:78-6610]
6 Russian, 6 Western.
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Approved For Release 2001/03/26 : CIA-RDP96-00787R000500130048-3

Approved For Release 2001/03/26 : CIA-RDP96-00787R000500130048-3
JPRS 80259
8 - MAR - 82
FLUID DYNAMICS
ÚDC 541.124/128
NONEQUILIBRIUM VIBRATIONAL MOLECULAR EXCITATION BEHIND SHOCK WAVE FRONT IN
GASES
Novosibirsk ZHURNAL PRIKLADNOY MEKHANIKI I TEKHNICHESKOY FIZIKI in Russian
No 5(129), Sep-Oct 81 (manuscript received 25 Jun 80) pp 49-54
NC
Ne
DOBKIN, S. V. and SON, E. Ye., Moscow
[Abstract] Previous research has shown that when a shock wave propagates
through a light gas doped slightly with a heavy gas, the length of transla-
tional relaxation of the heavy molecules is approximately mg/m times longer
than for the light molecules (where me and my are the masses of the heavy and
light components). This is because a large number of collisions is needed to
slow down a heavy particle. In this paper, a qualitative analysis is made of
phenomena that take place in deceleration of a molecule made up of atoms with
masses my and mp in a medium of particles of mass my (my>>mp>my ). The fraction
of vibrational energy transmitted to the molecule as it is decelerated in the
light gas is calculated, and an examination is made of relaxation of the
vibrational energy of molecules described by harmonic oscillators in the zone
of deceleration in the light gas behind the shock wave front. It is shown
that shock wave propagation in such a medium may be accompanied by a process
of "nonequilibrium" excitation of the heavy gas molecules in which the
vibrational temperature may rise to levels that exceed the gas temperature
behind the shock wave front in contrast to the equilibrium case. An example
of calculation of the vibrational energy in a shock wave in a mixture of helium
with uranium hexafluoride is given. The possibility of experimental confirma-
tion is discussed. Figures 2, references 7:
5 Russian, 2 Western.
[70-6610]
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