By George Hidy (Auth.)
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Extra info for Aerosols. An Industrial and environmental science
If the particle is s u s p e n d e d without motion in a stagnant gas, transport to or from the b o d y can be estimated from heat conduction or diffusion theory. 19) Ρ As ~ PA IS — O IO r w h e r e the radial direction from the center of the sphere is r and the sub scripts s and oo indicate the particle surface value and the value far from the sphere. 20) w h e r e DT is the thermal diffusivity kg/pgcp and cp is the specific heat of the particle. 21 ) where D ABi s th e binar y molecula r diffusivit y fo r th e t w o gases .
62 ) for th e stead y stat e c a s e . T h e dimensionles s n u m b e r i s th e S h e r w o o d num ber S h fo r particl e diffusion . Within thi s genera l framework , conside r a flow o f aeroso l alon g a flat plat e as show n i n Fig . 7 . A s th e ga s m o v e s ove r th e surface , th e frictio n a t th e surface decelerate s neighborin g layer s o f fluid, creatin g a velocit y gradient . Fig. 7 . Schemati c diagra m o f th e developmen t o f momentu m an d concentratio n boundar y layers ove r a flat plat e a t hig h value s o f th e Pecle t number .
5. 5 Typical Data for the Evaporation 0 Coefficient Material Temperature range (°C) Beryllium Copper Iron Nickel «1 -1 «1 -1 Ammonium chloride Iodine Mercurous chloride Sodium chloride Potassium chloride Water (liquid) ( 3 . 9 - 2 9 . 25 118-221 - 2 1 . 9 18-70 40-70 20 From Paul (1962); courtesy of the American Institute of Aeronautics and Astronautics. 25 is Φ Α = [4ΤΓ#Ζ)ΑΒ(ρ8 - p . 27b) caA \g/R)-K T h e b r a c k e t e d t e r m in t h e p r o d u c t o n t h e right is t h e c o n t i n u u m rate of m a s s = t h e slip correction is t h e last term on t h e right.
Aerosols. An Industrial and environmental science by George Hidy (Auth.)