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Diffusion Reaction Interaction for a Pair of Spheres - ETD ...

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2.4 Mutualism-like Problem: Analytical Solution<br />

2.4.1 Dimensionless <strong>Reaction</strong> Probability<br />

It is clear from (2.17), that equations (2.14) and (2.16) must be solved to<br />

obtain any valuable in<strong>for</strong>mation about the reaction probability at sphere 1 P, or<br />

the concentration outside <strong>of</strong> the two spheres u. Substituting f2m, equation (2.16),<br />

into f1m, equation (2.14), produces an independent linear expression <strong>for</strong> the first<br />

coefficient<br />

where<br />

⎡ +<br />

−1<br />

−(<br />

m+<br />

1)<br />

f1n Λ1n<br />

( γ d1<br />

) ⎢1<br />

f1m<br />

( d1<br />

) F , nm ⎥ (2.18)<br />

⎣ m=<br />

0<br />

⎦<br />

= ∑ ∞<br />

∑( )<br />

∞<br />

−2<br />

j ⎛ j + n⎞⎛<br />

j + m⎞<br />

j<br />

Fnm = γ d1<br />

⎜ ⎟⎜<br />

⎟ . (2.19)<br />

j=<br />

0 ⎝ n ⎠⎝<br />

m ⎠ j + 1<br />

The matrix F has three distinct properties: it is completely convergent, symmetric<br />

and can be expressed in an analytical <strong>for</strong>mat <strong>for</strong> all n and m (see Appendix A <strong>for</strong><br />

the development <strong>of</strong> F). In order to continue with the trapping probability equation<br />

(2.17), the first coefficient f1n is redefined as<br />

−1<br />

( d1<br />

) h n<br />

f1n Λ1n<br />

1<br />

⎤<br />

≡ γ (2.20)<br />

23

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