THE SUPERFICIAL RE-EMISSION LAW IN A FREE -MOLECULE FLOW.
POLITECNICO DI TORINO (ITALY) ISTITUTO DI MECCANICA APPLICATA
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The object of the research is a study of the validity of the re-emission model. According to such a re-emission model, the re-emitted molecules behave as a gas in Maxwellian equilibrium, subject to a thermal agitation and moreover to a translation motion. The space distribution law is established for the molecules re-emitted from an elementary rectangular surface and from an indefinite strip of elementary thickness. The obtained theoretical results are then compared with Hurlbuts experimental results obtained by nitrogen molecular beams impinging on lithium fluoride crystals. The comparison allows one to establish the values of two fundamental parameters referred to the re-emitted gas. Author
- Fluid Mechanics