Aerosols. An Industrial and environmental science by George Hidy (Auth.)

By George Hidy (Auth.)

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375Z 1 / i (/Z3 ) 2 (Ik) 0 . 3 7 5 Z // (3Z ) 2 ( 1 c ) 1 . 72) Disk* Velocity Remarks Particle shape Needle Settling 0 . 5) 2 / 3 0 . 68) 0 . 09) Circular ring bent from a long prolate ellipsoid, X = cIR > 1 2 2 2/2 permission of Wiley. 2 by Lerman (1979); reprinted with / /Χ], 2 = 2XI{\ - X 2 ) + [2(1 2- 2X )/(\ - X y ]tan-'[(l - 2 1 Χψ = -Xl(\ - X ) - [(2X - 3)/(l - Z ^ J s i n - K l - Z ) . a unit of electrical charge e. T h e principle of this experiment w a s to levitate a small oil droplet in an electrical field by first balancing the gravitational force on the droplet with an electrical force.

Collector charged, E C aerosol with naturally occurring charge, parameter [F - 3^. · , collector grounded, aerosol T charged by corona, parameter S . [Reprinted with permission from Kraemer and Johnstone G (1955). Copyright 1955 American Chemical S o c i e t y . ] At large R e , t w o dimensionless p a r a m e t e r s h a v e been used to characterize regimes of particle motion a r o u n d cylinders, for e x a m p l e . 49) E x a m p l e s o f difference s i n particl e motio n a r o u n d a charge d cylinde r ar e shown fo r differen t rate s o f G an d H i n Fig .

If a particle has an electrical charge of Q and is placed in a uniform electrical field E0, the electrical force balances the frictional force in steady motion. T h u s , the " t e r m i n a l v e l o c i t y " in an electrical field b a s e d on S t o k e s ' law is <7E = QE B 0 = QEj6TT^ R gy Re -> 0, K n - 0. 9) Particle motion induced by gravity can b e controlled using an electrical field. 5) (Ik) 1 . 375Z 1 / i (/Z3 ) 2 (Ik) 0 . 3 7 5 Z // (3Z ) 2 ( 1 c ) 1 . 72) Disk* Velocity Remarks Particle shape Needle Settling 0 .

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