Aqueous magnetic fluids instabilities in a hele-shaw cell

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作者：

'Lucian Blaga' University, Faculty of Science, Dr.Ratiu Street, No.5-7, Sibiu, 550024, Romania ^{[1
]}

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来源：

Opto. Adv. Mat. Rap. Comm. | 2009年 / 2卷 / 132-134期

关键词：

Magnetism - Cytology - Fractal dimension - Cells - Magnetic fluids;

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摘要：

In this study, it was investigated the interface patterns of two immiscible, viscous fluids into the geometry of a horizontal Hele-Shaw cell, considering that one of the fluids is an aqueous magnetic fluid. In general, the total energy of a magnetic fluid system consists of three components: gravitational, surface, and magnetic. For a magnetic fluid into a horizontal Hele-Shaw cell, the gravitational energy is constant and can be inessential, thus leaving only the surface and magnetic energies. The interface between two immiscible fluids, one of them with a low viscosity and another with a higher viscosity, becomes unstable and starts to deform. Dynamic competition in such confined geometry leads finally to the formation of fingering patterns of a magnetic fluid in a Hele-Shaw cell. The computational study upon the interface instabilities patterns in aqueous magnetic fluids was accomplished evaluating fractal dimension in finger-type instabilities. Between the fractal dimension and experimental instability generation time a correlation was established.

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