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throughout the flow region considered. The lines in the r, 6 plane on which r cosx (9/\v0) is equal to a constant (for fixed v0) are the streamlines of the field (26). Therefore, for vl < 1/X the innermost streamline in the region considered fixes the upper bound on A, and it is clear that the line 6 = \vair/2 must be excluded. For v\ > 1/X the point r = ra is the critical one in bounding A; only a finite part of the plane can be taken as the region considered.

On heat transfer problems in viscous flow