Finite Péclet Number
 

Hi,

I've done some CFD simulations on mass-transfer inside a rectangulat duct. Literature by Shah states I should get a Sherwood number of 3.09, while I'll got a value of 3.11. I've discussed this with people, and one of them mentioned this small deviation could be due to the fact that I (supposedly) consider a case with finite Péclet number.

What does this mean? What is a finite Péclet number and how can it influence my simulations?

Kind regards,

I don't know the meaning of the Sherwood problem but the Peclet number is a non-dimensional number appearing in the non-dimensional internal energy equation as product of the Reynolds and Prandtl number.
If you assume Pe->+Inf that is supposed to be congruent to the model of Euler equations for inviscid flows (ideal fluid). In your case, assuming a finite Pe number, you consider the Navier-Stokes equations for viscous flows (real fluid).

Thank you for the clear answer :)