Diffusion flux modeling: Application to direct entry problems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Scopus citations


Direct entry is a maneuver used by spacecraft that enter a planet's atmosphere without first orbiting the planet. Typical entry conditions involve high velocities in the range of 12 km/s and more. In contrast, the Space Shuttle reenters at velocities around 7.5 km/s. The high energy involved with an Earth direct entry causes the air to become completely dissociated and has a high degree of ionization compared to entries from Earth orbit. In this paper we compare the constant Lewis number Fickian diffusion method (CLN) to two multi-component models, the Self-Consistent Effective Binary Diffusion method (SCEBD) and the Stefan-Maxwell Iterative method (SM). The CLN method treats all species with the same diffusion coefficient, while the multi-component methods allow each species to have a separate diffusion coefficient that contributes to the overall diffusion. We have found that the multi-component methods give a lower surface heat flux and change other characteristics of the flow compared to the CLN method.

Original languageEnglish (US)
Title of host publication43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers
Number of pages11
StatePublished - Dec 1 2005
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 10 2005Jan 13 2005


Other43rd AIAA Aerospace Sciences Meeting and Exhibit
Country/TerritoryUnited States
CityReno, NV


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