THERMOMECHANICAL FORCE IN SUPERFLUID HE-II

The thermomechanical force acting on an asymmetrically heated body in HE II is discussed The force is produced by the normal component flow caused by the thermal inhomogeneity. The effect is calculated in terms of linearized dissipative two-liquid hydrodynamics for the case of a spherical body. For the 3-d geometry the force is essentially determin ed by the viscous contribution (while that for a plane body would be c aused by the hydrostatical fountain pressure). This fact results in th e sensitivity of the effect to the boundary conditions for v(nperpendi cular-to). Thus the experimental observation of the thermomechanical f orce can give an opportunity for measurement of the unknown kinetic co efficient.