Particulate distribution function evolution for ejecta transport

Conference · Fri Jan 01 04:00:00 EST 2010

OSTI ID:989834

Hammerberg, James Edward ^[1]; Plohr, Bradley J ^[1]

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1. Los Alamos National Laboratory

The time evolution of the ejecta distribution function in a gas is discussed in the context of the recent experiments of W. Buttler and M. Zellner for well characterized Sn surfaces. Evolution equations are derived for the particulate distribution function when the dominant gas-particle interaction in is particulate drag. In the approximation of separability of the distribution function in velocity and size, the solution for the time dependent distribution function is a Fredholm integral equation of the first kind whose kernel is expressible in terms of the vacuum time dependent velocity distribution function measured with piezo probes or Asay foils. The solution of this equation in principle gives the size distribution function. We discuss the solution of this equation and the results of the Buttler - Zellner experiments. These suggest that correlations in velocity and size are necessary for a complete description of the transport dala. The solutions presented also represent an analytic test problem for the calculated distribution function in ejecta transport implementations.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 989834
• Report Number(s): LA-UR-10-01100; LA-UR-10-1100
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
APPROXIMATIONS
DISTRIBUTION FUNCTIONS
INTEGRAL EQUATIONS
KERNELS
PARTICULATES
PROBES
TRANSPORT
VELOCITY