motion-apcd - 9/13/11 Aerosol & Particulate...

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Unformatted text preview: 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 11 Motion of Aerosol Newtons Resistance Law and Stokes Law Cunningham Slip Correction Factor Settling Velocity, Mechanical Mobility Particle Acceleration Aerodynamic Diameter Settling Chamber Brownian Motion & Diffusion Reading: Chap. 3.3- 3.4 http://aerosol.ees.ufl.edu/aerosol_trans/section01.html 9/13/11 Environmental Engineering 9/13/11 Aerosol & Particulate 22 History History : Galileos (1564-1642) experiment in Pisa tower Newtons Resistance Law : The force is proportional to the gas pushed away and the relative velocity between the sphere and the gas (negligible viscous force) V p CD = 0.44 for Rep > 1000 Tim Tebow can be a good air pollution engineer because he knows how to control the movement of particles in the air .. 9/13/11 Environmental Engineering 9/13/11 Aerosol & Particulate 33 Stokes Law : negligible inertial force compared to viscous force ( Rep < 1) Reynolds Number: inertial force/frictional force Two major parameters: V & dp Plot CD as a function of Rep for Newtons Law Plot CD as a function of Rep for Stokes Law Transition Regime 9/13/11 Environmental Engineering 9/13/11 Aerosol & Particulate 44 What is the max velocity of a particle to be in the Stokes regime? 1 , 1 0 , 1 0 0 ( = 1 .2 / 3 ; = 1 .8 1 1 0 -5 29 9/13/11 Environmental Engineering 9/13/11 Aerosol & Particulate 55 Categorize aerosol movement based on interaction between the particle and gas molecules Mean free path of gas ( 29...
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motion-apcd - 9/13/11 Aerosol & Particulate...

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