Experimental study of interface instability in a Hele-Shaw cell
- 1 June 1989
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 39 (11) , 5863-5866
- https://doi.org/10.1103/physreva.39.5863
Abstract
Experiments on the stability of the circular interface formed in a Hele-Shaw cell when air displaces a viscous oil have shown that available theories underestimate the wavelength of the most unstable wave when the capillary number (Nca) is large. Apparently this is caused by a modification of the interface boundary condition by three-dimensional effects. At small values of Nca the results overlap several of the theories and we are unable to choose among them on the basis of the present experiments.Keywords
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