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TsAGI Science Journal

ISSN Print: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2016018447
pages 367-388

THE INFLUENCE OF SURFACE ROUGHNESS ON SCATTERING OF FREE-MOLECULAR FLOW BY SOLID BODIES

Alexander Ivanovich Erofeev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Street, Zhukovsky, Moscow Region, 140180, Russian Federation
Alexander Petrovich Nikiforov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky St., Zhukovsky, Moscow Region, 140180 Russia
Sergei Borisovich Nesterov
S. A. Vekshinskii State Scientific Research Institute of Vacuum Technology, 7, Nagornyi Proezd, Moscow, 117105, Russia
Ramul'ya Amirovna Nezhmetdinova
S. A. Vekshinskii State Scientific Research Institute of Vacuum Technology, 7, Nagornyi Proezd, Moscow, 117105, Russia

ABSTRACT

The results of theoretical and experimental studies on the interaction of free-molecular gas flow with the rough surface of a solid body are presented. An atomic force microscope was used to define the roughness of flat metal and glass plates, which were used for investigations in the VAT-103 vacuum set up at TsAGI. The roughness parameter allowing the data on the scattering of molecular flows on rough surfaces of various types to be compared was determined based on computations made by the Monte Carlo method. The experimental results on the interaction of molecular flows with models of varying degrees of roughness are presented.