Aerosols. An Industrial and environmental science by George Hidy (Auth.)
By George Hidy (Auth.)
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Extra resources for Aerosols. An Industrial and environmental science
Also included are curves for intermediate collec tor Reynolds n u m b e r . T h e curves in Fig. 5 for Stk of about unity is apparent. T h e efficiency curve for the inviscid approximation is considera bly higher than the calculation for viscous flow for Stk < 100. E x p e r i m e n t s reported by R a n z and W o n g (1952) and later by Walton and W o o l c o c k (1960), for 70 ^ R e ^ 5700, generally agree with the inviscid approximation. Curves of collection efficiency versus Stk for a circular cylinder h a v e similar shape to those for a s p h e r e .
T h e slip coefficients are not k n o w n for particles, so E q . 13) is difficult to use for a priori estimates of the thermal force. W e note also that E q . 13) indicates that t h e thermal force goes to z e r o with K n . T h u s , in the contin u u m theory t h e r e can be no t h e r m o p h o r e t i c effect. In analogy to their motion in a thermal gradient, particles may experience a force associated with nonuniformities of composition in the suspending gas mixture. This force is called the diffusion or diffusiophoretic force.
From Davis et A B al. 2 2 The Dynamics of Small Particles ACCELERATED MOTION OF PARTICLES—DEPOSITION PROCESSES The behavior of particles in steady rectilinear flow represents the simplest configuration of interest in aerosol m e c h a n i c s . Of great practical importance is the accelerated motion of particles, since acceleration-induced fluid in media is at the root of deposition or collection p r o c e s s e s . Taking into ac count the fact that the particles in accelerated motion do not follow the gas speed, the drag force is D = (6^gR/A)(qg - q p) .