Diffusivity in Schmidt Number

[106coral]

Hello everyone,

I am trying to predict errosion-corrosion rate per year.
In order to do that I have to find Schmid number in its formular, Sc=µ?/d and then using the Berger and Hau correlation and rewriting to solve for K, K=(d/D)(0.0165)(Re)^0.86(Sc)^0.33
but I don't know how to calculate or find "d" which is referred to as a diffusivity.
For your reference, I am handling a slurry mixed water with fine sands of which dynamic viscosity is 150cP,density 1237 kg/m3, velociy 2.7m/s,Reynolds number 3251, NPS 6(Sch80)carbon steel pipe with no liner.
I would apprciate it if someone experienced previously advise me of my inquiry.
Please let me know if you need further information to answer.

Regards,

 

[monaco8774]

If its thermal diffusivity you are after this is defined as

(conductivity (j/m.s.°c)) / (density (kg/m3) x specific heat capacity (j/kg°c))

units in SI work out to m2/s

To give you an idea of the uusal value expected for water this is 1.753 exp -6 at 0 C

However there is also a term called diffusivity that relates to speed of reaching concentration equilibrium