= Elephter Andronikashvili
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{tag=Physicist}
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<Elephter Andronikashvili> tested the <two-fluid model of superfluidity> by oscillating a stack of closely spaced disks in liquid <helium-4>. Viscous coupling makes the normal component follow the disks, adding to their effective <moment of inertia>; the superfluid component need not rotate with them. Measuring the oscillation period as <temperature> changes therefore estimates the normal-fluid fraction under the apparatus's entrainment conditions. The experiment turns an apparently unusual flow law into a mechanical measurement of two distinct contributions to one liquid.<A direct observation of the two kinds of motion in helium II by Elephter Andronikashvili>[Journal of Physics 10, 201 (1946), two-component-motion experiment]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Elephter%20Andronikashvili%201986.jpg?width=250]
{title=Portrait of <Elephter Andronikashvili>}
{description=Devi Garibashvili (დევი ღარიბაშვილი), attribution on Commons. https://creativecommons.org/licenses/by-sa/4.0/[CC BY-SA 4.0], via Wikimedia Commons.}
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