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Old   May 27, 2004, 01:40
Default Unit of Expression
  #1
Fing
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Hello,

I would like to input a viscosity expression but I can not how to solve the problem of the unit of the expression. My expression will be:

M_u = exp(1.2 - 2.9*log_e(4.5*sstrnr))

where M_u is dynamic viscosity, sstrnr is the strain rate. How can I solve the unit problem?

Thanks,

Fing
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Old   May 27, 2004, 03:41
Default Re: Unit of Expression
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matej
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What I allways do is simple trick. in logs and exps multiplying the variables with 1 of reciprocal unit, and multiplying the result with a 1.0 with the desired unit.

if you have a some variable A [m^2] in a exp(A), and you want the result B in [K] using formula B= 100.0*exp(A), (really silly example), what you do is: B=100.0 [K] * exp(A *1.0 [m^-2])

and that's it!

matej

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Old   May 27, 2004, 10:17
Default Thank you, matej
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Fing
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Thanks, matej.

Regards,

Fing
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