An analytical study is presented for the freezing of a semi-infinite domain of wet coal particles with special attention to the role of the airborne water vapor diffusion process. The results indicate that energy transport in this multiphase system can occur by means of thermal diffusion or mass diffusion. The magnitude of the Lewis number can be used to determine the mechanism. For a Lewis number smaller than 1, water vapor will evaporate from the coal particles, condense on the wall, and increase the freezing rate in the system.

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