Abstract
A model description of the electrothermal effect in a superfluid liquid is proposed. It is hypothesized that the superfluid state is an ordered state with an isotropic quadrupole moment which does not manifest electrical properties in an equilibrium liquid. The polarization properties of the liquid are excited by an inhomogeneous distribution of the superfluid flow. The Landau equations of superfluid hydrodynamics are supplemented by an equation relating the electrical polarization of the medium with the density of the superfluid component and the inhomogeneity of the superfluid flow. The value of the expected oscillations of the electrical potential in a second-sound wave agrees with the measurements of A. S. Rybalko, Fiz. Nizk. Temp. 30, 1321 (2004) [Low Temp. Phys. 30, 994 (2004)].
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