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Free Molecular Gas Drag on Fluffy Aggregates

Published online by Cambridge University Press:  27 February 2018

R. Nakamura
R. Nakamura*
Affiliation:
The Graduate School of Science and Technology, Kobe University, Nada, Kobe 657, Japan

Abstract

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Computer simulations of the collisions of gas molecules with fluffy aggregates have been carried out to estimate gas drag forces in the free molecular flow limit. It is found that the gas drag force on fluffy aggregates can be approximated by that on an area-equivalent sphere in a wide range of relative velocities of the aggregate through ambient gas. The deviation from this approximation is weakly dependent on the relative velocity. This result leads to a significant increase of gas drag forces on fluffy aggregates compared to that on a mass-equivalent sphere.

Type
XII. Physical Processes and Laboratory Analyses
Information
International Astronomical Union Colloquium , Volume 150: Physics, Chemistry and Dynamics of Interplanetary Dust , 1996 , pp. 477 - 480
Copyright
Copyright © Astronomical Society of the Pacific 1996

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