Abstract
Experiments of large amplitude nonlinear oscillations of axially symmetric surfactant-bearing (triton or bovine serum albumin) water drops with different initial aspect ratios and drop volumes were performed during the second United States Microgravity Laboratory, USML-2 in November 1995. Through the numerical simulation of the oscillations of these surfactant-bearing water drops using the boundary integral method, the surface dilatational viscosity and the surface shear viscosity are found to play a major role in these oscillations. How they influence the damping coefficient and the drop oscillation frequency will be presented. The numerical and analytical results and a physical picture of the relation between the surface viscosities and the damping coefficient will be described. In addition, the relation between the initial drop aspect ratio, the surface viscosities, and the surface rotational velocity will also be presented. [Work supported by NASA through JPL, Contract No. 958722.]
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