Convective self-oscillations in magnetic colloids caused by soret effect

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

Convective self-oscillations in magnetic colloids caused by soret effect

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

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

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 language	English
Title of host publication	Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
Publisher	American Society of Mechanical Engineers
Pages	1
Number of pages	1
ISBN (Print)	0791819612
State	Published - 1 Dec 1999

ASJC Scopus subject areas

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

Cite this

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abstract = "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.",

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Convective self-oscillations in magnetic colloids caused by soret effect. / Shliomis, M. I.; Bacri, J. C.; Drikis, I. et al.
Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM). American Society of Mechanical Engineers, 1999. p. 1.

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

TY - CHAP

T1 - Convective self-oscillations in magnetic colloids caused by soret effect

AU - Shliomis, M. I.

AU - Bacri, J. C.

AU - Drikis, I.

AU - Perzynski, R.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - 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.

AB - 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.

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PB - American Society of Mechanical Engineers

ER -

Convective self-oscillations in magnetic colloids caused by soret effect

Abstract

ASJC Scopus subject areas

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