Abstract
An analysis of the photophoretic force and velocity on aerosol particles in both the free molecular and slip-flow regimes is presented. Under the assumption of unpolarized incident radiation, absorption of radiation with the particle is formulated from Lorenz/Mie theory. For both the free molecular and slip-flow regimes, the functional dependence of the photophoretic velocity upon the radiative size parameter and complex index of refraction is given by the photophoretic asymmetry factor J 1. An exact infinite-series expression for J 1 is derived which allows for rapid calculation of photophoretic behavior. Numerical results indicate that photophoresis can be a significant transport mechanism for micrometer-sized particulates in high radiative transfer combustion environments.
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