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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 2, p.155-157

    Paper

Bar’yakhtar V.G.1, Belokolos E.D.1, Golubeva O.N.2, Sukhanov A.D.3

1 Institute for Magnetism, Nat. Acad. of Sci. of Ukraine
(36b, Vernadskogo Prosp., Kyiv 03142, Ukraine; e-mail: vbar@imag.kiev.ua)
2 Peoples’ Friendship University of Russia
(Moscow, Russia)
3 Joint Institute for Nuclear Research
(Dubna, Russia)

A Ratio of the Shear Viscosity to the Density of Entropy for Helium

Section: Solid matter
Original Author's Text: English

Abstract: We have studied the ratio (η/s) of the shear viscosity η to the density of entropy s for helium as a function of the temperature and have established that the minimal value, (η/s)min, satisfies the Kovtun–Son–Starinets inequality, (η/s)min ≥ (ћ/4πkB).

Key words: Helium, ratio of the shear viscosity to the density of entropy, Kovtun–Son– Starinets inequality.