title: Flow pattern dynamics in convecting liquid helium.
abstract: We present experimental data which correlate thermal measurements and flow visualization in convecting liquid 4He. For a small range R(C)<R<R1 of the Rayleigh number R above the convection threshold value R(C) a robust stationary pattern is observed. This pattern exhibits periodic pulsation when R>R1, generating thermal oscillations as in earlier reports. At higher R values the time dependence becomes aperiodic with the surprising appearance of spiral-defect chaos at an aspect ratio smaller than has previously been reported.
authors: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
authors: R G
authors: RG
authors: Matley
authors: W Y
authors: WY
authors: Wong
authors: M S
authors: MS
authors: Thurlow
authors: P G
authors: PG
authors: Lucas
authors: M J
authors: MJ
authors: Lees
authors: O J
authors: OJ
authors: Griffiths
authors: A L
authors: AL
authors: Woodcraft