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Rayleigh-Bénard convection in a homeotropically aligned nematic liquid crystal
Leif Thomas, Werner Pesch, Guenter Ahlers
We report experimental results for convection near onset in a thin layer of a homeotropically aligned nematic liquid crystal heated from below as a function of the temperature diff…
Boundary Limitation of Wavenumbers in Taylor-Vortex Flow
Marcus Linek, Guenter Ahlers
We report experimental results for a boundary-mediated wavenumber-adjustment mechanism and for a boundary-limited wavenumber-band of Taylor-vortex flow (TVF). The system consists o…
Square patterns in Rayleigh-Benard convection with rotation about a vertical axis
Kapil M. S. Bajaj, Jun Liu, Brian Naberhuis +1
We present experimental results for Rayleigh-Benard convection with rotation about a vertical axis at dimensionless rotation rates in the range 0 to 250 and upto 20% above the onse…
Thermal Fluctuations, Subcritical Bifurcation, and Nucleation of Localized States in Electroconvection
Urs Bisang, Guenter Ahlers
Measurements of the mean-square amplitude of thermally-induced fluctuations of a thin layer of the nematic liquid crystal I52 subjected to a voltage V < Vc are reported. They yield…
Competition between Spiral-Defect Chaos and Rolls in Rayleigh-Benard Convection
Kapil M. S. Bajaj, David S. Cannell, Guenter Ahlers
We present experimental results for pattern formation in Rayleigh-Benard convection of a fluid with a Prandtl number, Pr~ 4. We find that the spiral-defect-chaos (SDC) attractor wh…