Balancing a ball on a moving vertical wall covered in viscous fluid

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• Tom Mullin, Department of Physics and Astronomy, University of Manchester
• Friday 14 March 2014, 16:00-17:00
• MR2, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Dr C. P. Caulfield.

We present the results of experimental investigations into balancing heavy balls and cylinders on a vertical moving wall using a thin layer of very viscous fluid. It is found that balance can be achieved over a narrow range of wall speeds so that a particle can be held at a fixed height. The fluid motion around the object is complicated in detail and yet the critical values for fixed point behaviour show simple scaling with the diameter of the particles. Fluctuations become important near critical conditions and clear differences are found in the distributions for the motion of cylinders and spheres.

This talk is part of the Fluid Mechanics (DAMTP) series.

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