Thermophoresis of an Aerosol Cylinder with Chemical Reactions
Date Issued
2014
Date
2014
Author(s)
Chen, Hung-Hsien
Abstract
The thermophoresis of a circular cylindrical particle bearing a chemical reaction in agas prescribed with a uniform temperature gradient in the direction perpendicular to its axisisanalyzed. The Knudsen number is assumed to be moderately small so that the fluid motion is in the slip-flow regime with effects of temperature jump, thermal creep, frictional slip, and thermal stress slip at the particle-gas interface. The appropriategoverning equations of heat conduction/generation and fluid motionare solved analytically and the thermophoretic velocity of the particle is obtained in closed forms. The thermophoretic velocity is a linear function of the thermal stress slip coefficient whose effect increases with an increase in the Knudsen number.When the composition-dependent factor of the chemical reaction within the particle does not depend on position, the thermophoretic velocity is diminished as the reaction is endothermic and augmented as the reaction is exothermic.When this factor is a function ofposition, the particle velocity can deflect from the direction of the imposed temperature gradient. For specified system characteristics,the effect of the chemical reaction on the thermophoreticvelocity of a circular cylindrical particle is significantly greater than thatof a spherical particle due to its smaller specific surface area.
Subjects
熱泳
圓柱氣膠粒子
化學反應
滑移流動
熱應力滑移
Type
thesis
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