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The ejected material from the impact of a gel drop on a deep gel pool

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We will be meeting for lunch at 1pm and the talk will be starting around 1:30pm. Please email us at damtp-gkb-request@lists.cam.ac.uk if you would like to join us for lunch.

Impact cratering experiments are performed using a Carbopol gel drop as the impactor and a deep Carbopol gel pool as the target. The ejecta curtain that arises upon impact grows in height and diameter with time until it finally collapses and gets deposited on the pool surface. A qualitative study of the instabilities that arise at the rim of the ejecta curtain will lead to the categorisation of the ejecta shape into 5 regimes according to a single dimensionless parameter that combines the inertial stress, the viscous stress and the yield stress. A detailed study of the ejecta sheet dimensions and the angle with the horizontal will show that the dynamics of this yield-stress fluid ejecta differ from those of water or granular ejecta.

This talk is part of the G.K. Batchelor Laboratory lunchtime seminar series.

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Rm 1.7, Hutchison/MRC Research Centre Cambridge University Engineering Department, CBL Seminar room BE4-38. For directions see http://learning.eng.cam.ac.uk/Public/Directions J

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