title: Buoyancy-drag mix model obtained by multifluid interpenetration equations.
abstract: In this paper, a buoyancy drag equation for describing the motion of the edges of a mixing zone driven by Rayleigh-Taylor or Richtmyer-Meshkov instabilities is derived from the multifluid interpenetration mix model equations of Scannapieco and Cheng [Phys. Letters A 299, 49 (2002)]. This derivation provides a physics foundation for a large class of phenomenological buoyancy-drag mix models and also establishes a physical connection between the microscopic collision frequency and the macroscopic fluid drag coefficient. The predicted values for model parameter a(ss') in the multifluid interpenetration mix model, from the Rocket-Rig experiments, is in the range of 0.043-0.125 depending upon the Atwood number. The results are also in good agreement with inertial confinement fusion capsule implosions.
authors.affiliation: Applied Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Baolian
authors.initials: B
authors.lastname: Cheng
authors.forename: A J
authors.initials: AJ
authors.lastname: Scannapieco