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Particle Relaxation Time

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Old   August 14, 2008, 07:55
Default Particle Relaxation Time
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chouki
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Hello, what is the signification of particle relaxation time in multiphase flows? Can you give me reference to read more about it? Kind regards, Chouki

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Old   August 26, 2008, 10:29
Default Re: Particle Relaxation Time
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A. Dehbi
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Tau_p= typical time for a particle response in a flow. If starting from rest, it takes tau_p for a particle to reach (1-1/e) of the fluid velocity.

tau_p= (particle density)*(particle diameter)^2 over (18*fluid molecular viscosity)

Check: Hinds: aerosol technology

Abdel

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Old   August 27, 2008, 09:10
Default Re: Particle Relaxation Time
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chouki
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Thank you very much but what do you mean by e (e=2.718282)? Regards, Chouki
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Old   August 27, 2008, 10:22
Default Re: Particle Relaxation Time
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A. Dehbi
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Yes, it is the exponential. A. Dehbi
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