CXLII. On the application of eigenfunction expansions to the problem of the thermal instability of a fluid sphere heated within
- 1 December 1955
- journal article
- research article
- Published by Taylor & Francis Ltd in The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
- Vol. 46 (383), 1310-1327
- https://doi.org/10.1080/14786441208521141
Abstract
The eigenvalue problem which describes the onset of convection in a fluid sphere heated within is solved by means of expansions of the convective velocity field and temperature in spherical Bessel functions. The Rayleigh number Cl,n , at which there first appears the nth radial convection pattern with the spherical symmetry of the lth spherical harmonic, can be computed for any l and n by this device, and bracketed to arbitrary accuracy. A table of Cl,n for Ifrom 1 through 6 and n=1 and 2 is compared with Chandrasekhar's values of C l 1 obtained by a variational method. A similar attack is shown to succeed on the classical Rayleigh- Benard problem of convection in a horizontal layer of fluid. Finally, the class of problems which should be amenable to such an attack is delineated.Keywords
This publication has 5 references indexed in Scilit:
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- LIX. On convection currents in a horizontal layer of fluid, when the higher temperature is on the under sideThe London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 1916