Phys. Rev. Lett. 88, 244503 (2002) [4 pages]Reentrant Hexagons in Non-Boussinesq Rayleigh-Bénard Convection: Effect of CompressibilityReceived 7 February 2002; published 31 May 2002 We present experimental studies of a new pattern sequence observed in non-Boussinesq convection in a compressible fluid near its gas-liquid critical point (CP). Besides the known hysteretic transitions among conduction state, hexagons, and rolls, another hysteretic transition from rolls to hexagons at higher values of the control parameter is found. This reentrance phenomenon is observed in a rather narrow range of about 60- to 100-μm cell heights and is attributed to large compressibility of a fluid near the CP. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.244503
DOI:
10.1103/PhysRevLett.88.244503
PACS:
47.54.+r, 47.20.Bp
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