Light-Induced Heat and Mass Transfer
in a Single-Component Gas in a Capillary

I. V. Chermyaninov, V. G. Chernyak, and E. A. Vilisova

Ural State University, Yekaterinburg, 620083 Russia

e-mail: vladimir.chernyak@usu.ru

Received February 14, 2007

Abstract—A theoretical analysis is presented of light-induced heat and mass transfer in a single-component
gas in a capillary tube at arbitrary Knudsen numbers. Surface and collisional mechanisms of transfer are ana-
lyzed, due to differences in accommodation coefficient and collision cross section between excited- and
ground-state particles, respectively. Analytical expressions for kinetic coefficients characterizing the gas drift
and heat transfer in a capillary tube are obtained in the limits of low and high Knudsen numbers. Numerical
computations are performed for intermediate Knudsen numbers. Both drift and heat fluxes are determined as
functions of the light beam frequency. In the case of an inhomogeneously broadened absorption line, the light-
induced fluxes are found to depend not only on the sign, but also on the amount, of light beam detuning from
the absorption line center frequency.

PACS numbers: 51.10.+y

DOI: 10.1134/S1063776107090063

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