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Convection in the presence of a first-order phase change Shinichi Sakurai,1,2

Summary: Convection in the presence of a first-order phase change
Shinichi Sakurai,1,2
Armin Tschammer,3
Werner Pesch,3
and Guenter Ahlers1
Department of Physics and Center for Nonlinear Science, University of California at Santa Barbara, Santa Barbara, California 93106
Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku,
Kyoto 606-8585, Japan
Physikalisches Institut der Universita®t Bayreuth, 95440 Bayreuth, Germany
Received 19 January 1999
We report experimental and theoretical results for two-phase convection in a thin horizontal layer of a fluid
with a first-order phase change and heated from below. A top layer of the nematic phase of a liquid crystal is
located above the bottom layer of the isotropic phase of the same substance. A horizontal field of 1000 G is
applied in order to align the director of the nematic phase. Over some ranges of the thickness of the isotropic
phase, and in sufficiently large thermal gradients, the more dense nematic phase can be stably stratified above
the less dense isotropic one, with a stable interface between them. Based on the equations of motion derived for
this problem by Busse and Schubert J. Fluid Mech. 46, 801 1971 , we evaluate the bifurcation lines between


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara
Schmidt, Matthias - Physikalisches Institut, Universitšt Bayreuth


Collections: Materials Science; Physics