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Equations originales encres de chine et huile sur bois

physics formulas Blog Archive Gravity on the Earth

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Sun, 21 Jun 2009 21:59:29 GM

On Earth, the . equation. allowing for notwithstanding​ gravitational smash functions the in ill choose of as the snooze of the bailiwick, but we be familiar with verbatim et literatim what m2 is - it's the aggregate of the Earth. as a zip ...

What is the differential equation for steady state molecular diffusion of fluid in a laminar flow?
Q. I need the equation in differential form for steady state molecular diffusion of a fluid in a laminar flow. I am looking for an equation that will work for Reynold's Number 35. Also is it possible to derive it from Ficks law of mass transfer?
Asked by Fluorine - Mon Nov 26 19:23:53 2007 - - 2 Answers - 0 Comments

A. Of course you can use Fick's law! Since it is dependent upon the molecular average velocity anyway, so your variable will be included, anyway; your equation is: JA= -DAB(dCA/dCB); where JA is the diffusion flux for component A, which is proportional to the concentration gradient dCA/dCB, DAB is the diffusivity of component A in its mixture with B. Now how we come up with that and in regard to velocities; the molal flux of a mixture is NM=rMuo, where rM is the average MOLAR denisty of the mixture and uo is the average velocity, then, by substituting rM with more measurable variable which is the molar concentration, we obtain -for a molecule of A crossing a stationary plane with a linear velocity the following: NA=cAuA; so JA=cAuA-cAuo… [cont.]
Answered by Dean B - Mon Nov 26 20:12:20 2007