Photophoretic forces for bispherical aerosol particles

Aleksander A. Cheremisin; Yu. V. Vassilyev; A. V. Kushnarenko

doi:10.1117/12.497278

28 March 2003 Photophoretic forces for bispherical aerosol particles

Aleksander A. Cheremisin, Yu. V. Vassilyev, A. V. Kushnarenko

Proceedings Volume 5027, Ninth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics; (2003) https://doi.org/10.1117/12.497278
Event: Ninth Joint International symposium on Atmospheric and Ocean Optics, 2002, Tomsk, Russian Federation

Abstract

The gravito-photophoretic forces in the free-molecular regime have been calculated for the bispherical aerosol particles by using the Monte-Carlo method to estimate molecular transfer. It is shown that two types of gravito-photophoresis can contribute to levitation of aerosol particles absorbing the Sun and the Earth's radiation. There are the well-known Δα-gravito-photophoresis, its cause is a different in the thermal accommodation coefficient, and ΔT-gravito-photophoresis, when the aerosol aggregate consists of individual particles differing in temperature due to a difference in the physical properties and the radiation absorption power. Both mechanisms can induce large lifting forces able to provide a vertical transport of aerosol particles into the upper atmosphere. A connection between an existence of aerosol layers at altitudes near 20, 50, 70-100 km in the real Earth's atmosphere and a condition of the balance of photophoretic and gravity forces is shown.

Citation Download Citation

Aleksander A. Cheremisin, Yu. V. Vassilyev, and A. V. Kushnarenko "Photophoretic forces for bispherical aerosol particles", Proc. SPIE 5027, Ninth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics, (28 March 2003); https://doi.org/10.1117/12.497278

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