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3. Vibrations of a Columnar Vortex

Published online by Cambridge University Press:  15 September 2014

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Extract

This is a case of fluid motion, in which the stream lines are approximately circles, with their centres in one line (the axis of the vortex) and the velocities approximately constant, and approximately equal at equal distances from the axis. As a preliminary to treating it, it is convenient to express the equations of motion of a homogeneous incompressible inviscid fluid (the description of fluid to which the present investigation is confined) in terms of “columnar co-ordinates” r, θ, z, that is co-ordinates such that r cos θ = x, r sin θ = y.

Type
Proceedings 1879–80
Copyright
Copyright © Royal Society of Edinburgh 1880

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References

page 446 note * Compare Proceedings, March 17, 1879, “Gravitational Oscillations of Rotating Water.” Solution II. (Case of Circular Basons).

page 451 note * “On the Effect of Internal Friction on the Motion of Pendulums,” equations (93) and (106).—Cambridge Phil. Trans., Dec. 1850.

P.S.—I am informed by Mr J. W. L. Glaisher that Gauss, in section 32 of his “Disqusitiones Generales circa seriem infinitam ” (Opera, vol. iii. p. 155), gives the value of in his notation, to 23 places as follows:—

1·96351 00260 21423 47944 099.

Thus it appears that the last figure in Stokes' result (106) ought, as in the text, to be 0 instead of 2. In Callet's Tables we find

logє 8=2·07944 15416 79835 92825,

and subtracting the former number from this we have the value of E to 20 places given in the text.

page 451 note † Stokes, ibid.

page 455 note * Republished in Lömmel's “Besselsche Functionen,” Leipzig, 1868.

page 456 note * “Vortex Atoms,” Proc. Roy. Soc. Edin., Feb. 18, 1867.