ABSTRACT: The forced oscillations of a system consisting of two finite liquid columns in a
duct separated by a gas bubble are studied in the linear approximation. It is found that
thermal processes in the gas induce a very significant damping in the system, that can
exceed viscous damping even in capillaries with a sub-millimeter diameter. The study is
motivated by the possibility of using gas bubbles as actuators in microdevices.
J. Acoust. Soc. Am., in press
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