Thermal - Thermal & Radiometric Forces Thermophoresis:...

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4/8/10 1 Thermophoresis: Particle motion in a temperature gradient, from a hotter to a colder region Molecular impacts on a particle ( dp < λ ) in a temperature gradient Reading: Chap. 8 Hot Cold T1, c1 T2, c2 λ d p Q: What if the cylinder is colder than the environment? http://aerosol.ees.ufl.edu/Thermophoresis/section01.html http://aerosol.ees.ufl.edu/Thermophoresis/section02.html
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4/8/10 2 Thermal force on a particle Velocity Free Molecular Regime Obj10 Obj101 + + + + 2245 - = Kn k k Kn k k Kn H T T H d F p a p a g p th 4 . 4 / 2 1 2 . 2 / 3 1 1 2 9 2 ρ πμ Obj103 Continuum Regime Thermal force on a particle Velocity Q: What if Kn << 1? Q: What if kp >> ka ? ka ~ kp ? http:// aerosol.ees.ufl.edu/Thermophor
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4/8/10 3 Terminal Settling & Thermophoretic Velocity in a Unit Temperature Gradient @ 20
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Thermal - Thermal &amp; Radiometric Forces Thermophoresis:...

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