 Rotne--Prager mobility

ID: rotne-prager-mobility

For two equal, well-separated spheres, the Rotne--Prager cross-mobility through order

a^{3} / R^{3}

is proportional to

\frac{3 a}{4 R} (I + R R) + \frac{a ^{3}}{2 R ^{3}} (I - 3 R R) .

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