Core dynamics of multi-armed spirals in Rayleigh-Bénard convection

Physica Scripta T

Volumn 67, Issue , 1996, Pages 111-116

  Plapp, Brendan B ^a   Bodenschatz, Eberhard ^a  

^a Sibley School of Mechanical and Aerospace Engineering   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000325432     PISSN: 02811847     EISSN: None     Source Type: Conference Proceeding    
DOI: 10.1088/0031-8949/1996/t67/022     Document Type: Article

References (34)

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29. Plapp, B. B. and Bodenschatz, E., in preparation.
30. The step widths varied as follows: cell #1: 1.2 mm to 0.9 mm; #2: 0.5 mm to 0.4 mm; #3: 1.1 mm to 0.6 mm; #4: 0.8 mm to 0.5 mm; #5: 0.8 mm to 0 mm; #6: 0.4 mm to 0 mm. With a cell height of 447 μm, the cells' radial aspect ratios Γ= r/d were: #1: 48.4; #2: 38.8; #3: 28.4; #4: 23.8; #5: 19.1; #6: 14.9. We excluded from this report cells #5 and #6, for which the radial variation significantly influenced the pattern evolution.
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33. This is similar to the target instability; see, for example, Newell, A. C., Passot T. and Souli, M., J. Fluid Mech. 220, 187 (1990).
34. For this experiment the non-Boussinesq number P ≈ -0.7, which is much smaller than P ≈ -3.4 of the prior experiment on non-Boussinesq convection [12]. Hexagons were replaced by rolls for e > 0.008.