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Surface characterization through shape oscillations of drops in microgravity and 1-gThe goal of these experiments is to determine the rheological properties of liquid drops of single or multiple components in the presence or absence of surface active materials by exciting drops into their quadrupole resonance and observing their free decay. The resulting data coupled with appropriate theory should give a better description of the physics of the underlying phenomena, providing a better foundation than earlier empirical results could. The space environment makes an idealized geometry available (spherical drops) so that theory and experiment can be properly compared, and allows a 'clean' environment, by which is meant an environment in which no solid surfaces come in contact with the drops during the test period. Moreover, by considering the oscillations of intentionally deformed drops in microgravity, a baseline is established for interpreting surface characterization experiments done on the ground by other groups and ours. Experiments performed on the United States Microgravity Laboratory Laboratory (USML-1) demonstrated that shape oscillation experiments could be performed over a wide parameter range, and with a variety of surfactant materials. Results, however, were compromised by an unexpected, slow drop tumbling, some problems with droplet injection, and the presence of bubbles in the drop samples. Nevertheless, initial data suggests that the space environment will be useful in providing baseline data that can serve to validate theory and permit quantitative materials characterization at 1-g.
Document ID
Document Type
Conference Paper
Apfel, Robert E. (Yale Univ. New Haven, CT, United States)
Holt, R. Glynn (Yale Univ. New Haven, CT, United States)
Tian, Yuren (Yale Univ. New Haven, CT, United States)
Shi, Tao (Yale Univ. New Haven, CT, United States)
Zheng, Xiao-Yu (Yale Univ. New Haven, CT, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1994
Publication Information
Publication: NASA. Marshall Space Flight Center, Joint Launch + One Year Science Review of USML-1 and USMP-1 with the Microgravity Measurement Group
Subject Category
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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