TY - JOUR
T1 - Viscosity in keplerian disks
T2 - Steady-state velocity distribution and non-local collision effects
AU - Petit, J. M.
AU - Greenberg, Richard
N1 - Funding Information:
We are grateful for help and comments by Dan Durda, Joe Plassmann, Jyrki Hanninen, and Michel Henon. Thoughtful reviews by Glen Stewart and Heikki Salo were also valuable. The research reported here was done during Jean-Marc Petit’s extended visit to the Lunar and Planetary Laboratory, on leave from the Observatoire de Nice. This work was supported by NASA’s Planetary Geology and Geophysics program.
PY - 1996/10
Y1 - 1996/10
N2 - A kinetic model based on a numerical algorithm, rather than Boltzman's equation, yields the viscosity and velocity distribution for colliding, finite-size particles in a planetary ring. Results are similar to those of many-particle simulations, and show that non-local effects due to the finite size are dominant in many cases of interest. Only for small particles does the viscosity decrease with increasing optical thickness sufficiently for the standard ringlet instability model to apply. This numerical kinetic theory will allow study of multi-size particle distributions, as well as scattering due to gravitational interactions or alternative collision models.
AB - A kinetic model based on a numerical algorithm, rather than Boltzman's equation, yields the viscosity and velocity distribution for colliding, finite-size particles in a planetary ring. Results are similar to those of many-particle simulations, and show that non-local effects due to the finite size are dominant in many cases of interest. Only for small particles does the viscosity decrease with increasing optical thickness sufficiently for the standard ringlet instability model to apply. This numerical kinetic theory will allow study of multi-size particle distributions, as well as scattering due to gravitational interactions or alternative collision models.
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U2 - 10.1006/icar.1996.0176
DO - 10.1006/icar.1996.0176
M3 - Article
AN - SCOPUS:0030268347
SN - 0019-1035
VL - 123
SP - 524
EP - 535
JO - Icarus
JF - Icarus
IS - 2
ER -