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Old   November 29, 1999, 18:57
Default Diffusion Coefficients
  #1
Thomas P. Abraham
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Hello Everyone:

I am working on a problem which involves pure mixing without anyone reaction. The fluids used are ethylene glycol and water. Can you anyone help me in estimating the value of the diffusion coefficient bewteen these two fluids?

Thanks,

Thomas
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Old   November 30, 1999, 04:47
Default Re: Diffusion Coefficients
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Nigel Smith
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yes...it's quite obvious when you think about it.

it's roughy 0.789.

I worked it out....
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Old   November 30, 1999, 06:00
Default Re: Diffusion Coefficients
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Thomas P. Abraham
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Hi Nigel,

Can you please me know the procedure and formulas used to arrive at this value?

Thanks,

Thomas
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Old   December 2, 1999, 07:01
Default Re: Diffusion Coefficients
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Jin Wook LEE
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Dear Thomas

I do not have exact data but diffusion coefficients of solute in the water(solvent) is order of 10^(-5) sq.cm/sec. If your problrm is turbulent flow(usual case), approximate value might be O.K. because turbulent diffusion is predominat, maybe as large as 'order of 10^2 ~ 10^3' than molecular diffusion.

Sincerely, Jinwook
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