Monte Carlo Simulation Of Contaminant Transport To And Deposition On Complex Spacecraft Surfaces

J. R. Phillips; M. C. Fong; T. D. Panczak

doi:10.1117/12.962865

2 January 1990 Monte Carlo Simulation Of Contaminant Transport To And Deposition On Complex Spacecraft Surfaces

J. R. Phillips, M. C. Fong, T. D. Panczak

Proceedings Volume 1165, Scatter from Optical Components; (1990) https://doi.org/10.1117/12.962865
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

A test molecule Monte Carlo simulation algorithm was devised and tested to compute near equilibrium transitional flow and resulting mass flux on complex surface geometries. The results agreed, within the calculated statistical error of the simulation, with known analytical solutions at the free molecular limit, and gave satisfactory agreement near the continuum limit, when compared to a diffusion model with slip boundary conditions. The effects of the Knudsen number on dimensionless mass exchange factors are considered for slip flow in an aperture geometry. A variety of surface outgassing and surface adsorption-migration kinetics models can be mated with the test molecule simulation to compute surface deposition values. A multimolecular layer model with two-neighbor migration is considered as one such alternative for surface adsorption-migration kinetics. Calculations of surface deposition for heavy chain oil molecules, known as DC-704, are compared to experi-mental data, showing good agreement. This kinetic model can serve as a boundary condition when computing the exchange of mass among various surfaces.

Citation Download Citation

J. R. Phillips, M. C. Fong, and T. D. Panczak "Monte Carlo Simulation Of Contaminant Transport To And Deposition On Complex Spacecraft Surfaces", Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); https://doi.org/10.1117/12.962865

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KEYWORDS

Molecules

Monte Carlo methods

Adsorption

Reflection

Optical components

Diffusion

Data modeling

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