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Chase (1979), using some results from Landau and Lifshitz (1959), shows
that, for well-separated spheres of radius *R*, the factor

| |
(34) |

where
| |
(35) |

with . Here ,and is the viscosity of the fluid, as usual. Comparing
the main terms, we find that this formula shows
| |
(36) |

which is in complete agreement with (27), and
| |
(37) |

The result (37) is the first of several results showing that
*F* behaves like for large .

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Stanford Exploration Project

7/8/2003