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Capillarylike Fluctuations at the Interface of Falling Granular Jets

by: Yacine Amarouchene, Jean F Boudet, Hamid Kellay
Physical Review Letters, Vol. 100, No. 21. (2008)

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We study the interface fluctuations of a granular jet falling under gravity and show that for small scales they are the analog of the thermally induced capillary waves. Experimental results from radial height and velocity fluctuations, static correlation functions and capillary ripple velocities allow us to estimate a granular surface tension. The ultralow interfacial tensions measured (of the order of 100 µN/m) can be rationalized using a simple model.


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