Linear stability analysis of the Hele-Shaw cell with lifting plates

Details Linear stability analysis of the Hele-Shaw cell with lifting plates Linear stability analysis of the Hele-Shaw cell with lifting plates

1996-10-13

arxiv.org/abs/cond-mat/9610103v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, RevTeX, 3 postscript files included

Scientific paper

The first stages of finger formation in a Hele-Shaw cell with lifting plates are investigated by means of linear stability analysis. The equation of motion for the pressure field (growth law) results to be that of the directional solidification problem in some unsteady state. At the beginning of lifting the square of the wavenumber of the dominant mode results to be proportional to the lifting rate (in qualitative agreement with the experimental data), to the square of the length of the cell occupied by the more viscous fluid, and inversely proportional to the cube of the cell gap. This dependence on the cell parameters is significantly different of that found in the standard cell.

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