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Thermal convection in a thermosensitive colloidal suspension

Title data

Winkel, Florian ; Messlinger, Stephan ; Schöpf, Wolfgang ; Rehberg, Ingo ; Siebenbürger, Miriam ; Ballauff, Matthias:
Thermal convection in a thermosensitive colloidal suspension.
In: New Journal of Physics. Vol. 12 (May 2010) . - no. 053003.
ISSN 1367-2630
DOI: https://doi.org/10.1088/1367-2630/12/5/053003

Project information

Project title:
Project's official titleProject's id
Teilprojekt Konvektion in SuspensionenNo information

Project financing: Deutsche Forschungsgemeinschaft
FOR608

Abstract in another language

Thermal convection is investigated experimentally in a microgel suspension that consists of core-shell colloids, which change their size with temperature. The swelling and shrinking of the particles strongly modify their volume fraction in the carrier fluid and therefore the viscosity of the suspension. In this experiment, thermal convection in a Hele–Shaw-like apparatus is monitored using the shadowgraph technique. When compared to a normal fluid, the threshold temperature difference is reduced dramatically, which is interpreted as a manifestation of the Soret effect, i.e. the temperature gradient applied to the suspension induces an unstable gradient of the colloid concentration. The wavelength in the nonlinear regime is very different from the one observed in water. Furthermore, transient oscillations of the patterns are detected in the nonlinear regime and are investigated as a function of the applied temperature difference.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Nonlinear dynamics; Pattern formation; Spatially extended systems; Thermal convection; Thermosensitive colloidal suspensions
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Mar 2014 12:21
Last Modified: 20 Feb 2019 10:21
URI: https://eref.uni-bayreuth.de/id/eprint/172