Summary: RESEARCH SUMMARIES
July 2003 June 2004
Guenter Ahlers 06/01/87-01/14/04 $2,238,854
Department of Energy, DE-FG03-87ER13738
Bifurcations and Patterns in Nonlinear Dissipative Systems
Pattern formation in non-linear dissipative systems is explored by subjecting a variety of
systems to a thermal gradient. Compressed gases, binary mixtures and nematic liquid
crystals heated from below are studied in and around the transition to convection.
Understanding of instabilities in complex fluids is sought for.
Guenter Ahlers 09/15/03-3/14/07 $610,486
Department of Energy, DE-FG02-03ER46080
Heat Transport by Turbulent Rayleigh-Benard Convection
We hope to complete the construction of a turbulence facility which can accommodate large
convection cells with a diameter of 0.5m. Initially we will operate this system using water,
methanol, ethanol, and iso-propanol as the convecting fluids. This work spans the Prandtl
number range from = 4 to 34 and the Rayleigh number range up to 1013
. The system is
designed so that it can be used later in our program with gasses at pressures up to 10 bars.
Using SF6, we expect to reach Rayleigh numbers up to 2 x 1013