on o=o, the limiting velocity for long columns obtained by the WRL theory. The effect of the column length is expressed by the second factor in eq 8 with the Laplace length as a scaling factor.Acknowledgment. L.G. is indebted to the University of Antwerp (U.I.A.) for a postdoctoral fellowship during the course of this work. We also thank Guido Serrien for help during the preparation of this manuscript.
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