Induced velocities of grains embedded in a turbulent gas

Details Induced velocities of grains embedded in a turbulent gas Induced velocities of grains embedded in a turbulent gas

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978m%26p....19..221v&link_type=abstract

(Conference on Protostars and Planets, Tucson, Ariz., Jan. 3-7, 1978.) Moon and the Planets, vol. 19, Oct. 1978, p. 221-227.

Computer Science

7

Cosmic Dust, Interstellar Gas, Particle Theory, Protostars, Stellar Atmospheres, Turbulence Effects, Granular Materials, Incompressible Flow, Kolmogoroff Theory, Particle Motion, Scale Height, Velocity Distribution

Scientific paper

A theory is presented for the dynamics of dust particles in an incompressible turbulent fluid. Grain-gas coupling occurs through friction forces that are proportional to the mean grain velocity relative to the gas. This test particle theory is applied to the case of Kolmogoroff spectrum in a protostellar cloud. The mean turbulence induced grain velocity and the mean turbulent relative velocity of two grains are calculated. Whereas the former should determine the dust scale height, grain-grain collisions are influenced by the latter. For a reasonable strength of turbulence, the mean induced relative velocity of two particles turns out to be at least as large as the corresponding terminal velocity difference during gravitational settling.

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