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download pdf version of PhD book - Universiteit Utrecht

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Appendix C<br />

average velocity:<br />

ṽ = v − v<br />

(C.5)<br />

The term nc i ṽ represents the mixing <strong>of</strong> the solute within an REV as a result<br />

<strong>of</strong> pore-scale velocity fluctuations within the pores. Together with the diffusive<br />

flux nj i , it is known as macro-scale hydrodynamic dispersion and is denoted<br />

by J i J i = nc i ṽ + nj i (C.6)<br />

substituting Equation (C.6) into Equation (C.4), the final form <strong>of</strong> averaged<br />

mass transport equation is obtained<br />

∂nc i<br />

∂t<br />

+ ∇ · (nc i v ) (<br />

+ ∇ · nJ i) = nr i − 1 V<br />

∫<br />

A fs [<br />

c i (v − w) + j i] · ndA (C.7)<br />

208

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