Convective self-oscillations in magnetic colloids caused by soret effect

M. I. Shliomis, J. C. Bacri, I. Drikis, R. Perzynski

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


An externally imposed temperature gradient induces in a binary fluid mixture a certain concentration gradient (the Soret effect). The characteristic time to establish the concentration distribution is much longer than the time to establish the temperature distribution. In colloidal solutions like magnetic fluids the ratio of these time-scales reaches 104. Therefore the Soret convection may start in binary mixtures long before the establishment of a stationary concentration gradient. Soon after the onset, however, the fluid motion is expected to rapidly mix the concentration gradient leading to an immediate damping of convection. Then the gradient of concentration is slowly formed again and the process is repeated. Thus we predict Soret-driven convective self-oscillations. The period of these oscillations is estimated for real magnetic colloids in a Hele-Shaw configuration.

Original languageEnglish
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
PublisherAmerican Society of Mechanical Engineers
Number of pages1
ISBN (Print)0791819612
StatePublished - 1 Dec 1999

ASJC Scopus subject areas

  • Earth and Planetary Sciences (all)
  • Engineering (all)
  • Environmental Science (all)


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