Main Page
About the Journal
Subscription information

Current Issue
Tables of Contents
Author Index


Experimental investigations of the microconvective instability in optically induced gratings

A. Mezulis - E. Blums

Institute of Physics, University of Latvia, 32 Miera str., Salaspils, LV-2169

Forced Rayleigh scattering experiments (FRS) are well known as a tool to measure diffusion D and Soret ST coefficients . In FRS experiments the temperature grating is optically induced in a thin sample layer by focusing a periodic pattern (usually one-dimensional parallel stripes) of intense illumination. Employing ferrofluid samples, due to the Soret effect, a primary induced temperature grating creates a particle concentration grating. The steady-state of the concentration grating is examined to define ST, whereas D may be easily calculated by knowing the half-period a of the induced grating and by measuring relaxation time τD of the concentration grating from its vanishing stage, after the illumination source is switched off. Figs 3, Refs 10.

Magnetohydrodynamics 41, No. 4, 341-348, 2005 [PDF, 0.10 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X