Collisions between grains in a turbulent gas

Details Collisions between grains in a turbulent gas Collisions between grains in a turbulent gas

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85..316v&link_type=abstract

Astronomy and Astrophysics, vol. 85, no. 3, May 1980, p. 316-325.

Astronomy and Astrophysics

Astrophysics

108

Cosmic Dust, Interstellar Gas, Particle Collisions, Turbulence Effects, Collision Rates, Grains, Kinetic Theory, Particle Size Distribution, Protostars

Scientific paper

Turbulent gas motions will induce random velocities of small dust grains that are imbedded in the gas. Within large eddies the friction forces from the gas lead to strongly correlated velocities for neighboring grains, whereas small eddies cause uncorrelated grain motions. The nonlinear response of a grain to eddy motion is calculated. This leads to a turbulent pressure within the dust component as well as to collisions between pairs of grains. The results are evaluated numerically for a Kolmogoroff spectrum and turbulent collision rates are calculated for molecular clouds and protostellar environments. Whereas grain-grain collisions should not modify the initial size distribution in molecular clouds to a significant extent, they will lead to an entirely different grain population in protostars.

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