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The presence of microconvective instability in optically induced gratings. (English) Zbl 1130.80003

Summary: In the present work, attention is paid to some significant effects (phenomena) in forced Rayleigh scattering (FRS) experiments with an applied magnetic field, \(\nabla T\parallel{\mathbf H}\), which have not been analyzed before. The work deals with the idea that the experimentally observed effects are caused by microconvection. The dimensionless numbers \(Cm\) and \(Rm\), which are responsible for the onset of microconvection, are calculated from experiments as well as from the linear stability analysis in a Hele-Shaw approximation. The problem of definition of the true values of diffusion and Soret coefficients from experiments and their field dependence, which are not affected by the assumed microconvection, is solved by original data processing.

MSC:

80-05 Experimental work for problems pertaining to classical thermodynamics
80A20 Heat and mass transfer, heat flow (MSC2010)
78A45 Diffraction, scattering
76D27 Other free boundary flows; Hele-Shaw flows
76R50 Diffusion
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References:

[1] Demouchy G., J. Appl. Phys. 37 pp 1– (2004)
[2] Igonin M., J. Magnetohydrodynamics 37 pp 53– (2001)
[3] Cebers A., J. Magnetohydrodynamics 38 pp 265– (2002)
[4] DOI: 10.1103/PhysRevLett.74.5032
[5] DOI: 10.1103/PhysRevE.52.3936
[6] Blums E., Progress in Engineering Heat Transfer 247 pp 947– (1999)
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