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A flow pattern is said to be *axisymmetric* when it is identical in every plane that passes through a
certain straight-line. The straight-line in question is referred to as the symmetry axis. Let us set up a Cartesian
coordinate system in which the symmetry axis corresponds to the
-axis. The flow is most
conveniently described in terms of the cylindrical coordinates (
,
,
), or
the spherical coordinates (
,
,
). Here,
,
,
, and
. (See Appendix C.) In particular,
and
.

Richard Fitzpatrick
2016-03-31