EFFECT OF INCOMPLETE ENERGY ACCOMMODATION ON FREE-MOLECULE RECOVERY TEMPERATURE,
Abstract
A model of the wall boundary condition in kinetic theory is described and applied to the analysis of the recovery temperature of a circular cylinder placed transverse to a free-molecule stream. This model, more sophisticated than its predecessor, is constructed to allow the description of the non-monotonic variation of thermal accommodation coefficient with gas energy which has been predicted by elaborate theoretical investigations and has been observed experimentally. The model is found to fit all of the available recent experimental data for thermal accommodation coefficients for rare gases on tungsten. The use of this model to predict free-molecule recovery temperatures reveals a pronounced effect of incomplete accommodation on the relationship between recovery temperature and flow Mach number. This has important implications regarding the interpretation of flow field measurements made with a free-molecule recovery temperature probe. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0660533
Entities
People
- Melvin Epstein
Organizations
- The Aerospace Corporation