English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Experiments on three systems with non-variational aspects

Bodenschatz, E., Cannell, D. S., de Bruyn, J. R., Ecke, R., Hu, Y. C., Lerman, K., et al. (1992). Experiments on three systems with non-variational aspects. Physica D: Nonlinear Phenomena, 61(1-4), 77-93. doi:10.1016/0167-2789(92)90150-L.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0003-EC21-E Version Permalink: http://hdl.handle.net/21.11116/0000-0003-EC22-D
Genre: Journal Article

Files

show Files

Locators

show
hide
Locator:
Link (Any fulltext)
Description:
-

Creators

show
hide
 Creators:
Bodenschatz, E.1, Author              
Cannell, D. S., Author
de Bruyn, J. R., Author
Ecke, R., Author
Hu, Y. C., Author
Lerman, K., Author
Ahlers, G.1, Author              
Affiliations:
1Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

Content

show
hide
Free keywords: -
 Abstract: We present recent experimental results for three pattern-forming systems in which non-variational effects play an important role. The first is thermal convection in a shallow horizontal layer of fluid with temperature-dependent properties. In this system, a hexagonal lattice of convection cells forms at onset. This lattice becomes unstable to rolls when the temperature difference is increased sufficiently. In the ''roll'' state, the rolls are curved and the system forms stable rotating spirals. The rotating spiral states are associated with non-variational effects. Secondly, we discuss the formation of localized pulses in binary-mixture convection near onset. These pulses would not exist in a potential system. In narrow channels, they have been observed as stable states. In systems which are spatially extended in two dimensions they can form spontaneously, and can be long-lived. The third topic which we discuss is the Kuppers-Lortz instability in a thin horizontal layer of a Boussinesq fluid heated from below and rotated about a vertical axis. In this case, the pattern which forms immediately above the onset of convection is non-periodically time dependent even though the amplitude grows continuously from zero as the temperature difference is increased. The dominant mechanism of the instability is found to involve the motion of boundaries between coherent regions of convection rolls of a given orientation. The time dependence could not occur in a variational system. Since it occurs for arbitrarily small amplitudes, one might hope that it is amenable to theoretical analysis.

Details

show
hide
Language(s): eng - English
 Dates: 1992-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/0167-2789(92)90150-L
BibTex Citekey: BODENSCHATZ.CANNELL.ea1992
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physica D: Nonlinear Phenomena
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 61 (1-4) Sequence Number: - Start / End Page: 77 - 93 Identifier: -