  A thermal gradient-induced circular motion of particles placed on
ferroelectric nematic liquid crystal sessile drops is demonstrated and
explained. Unlike hurricanes and tornadoes that are the prime examples for
thermal motors and where turbulent flows are apparent, here the texture without
tracer particles appears completely steady indicating laminar flow. We provide
a simple model showing that the tangential arrangement of the ferroelectric
polarization combined with the vertical thermal gradient and the
pyroelectricity of the fluid drives the rotation of the tracer particles that
become electrically charged in the fluid. These observations provide a
fascinating example of the unique nature of fluid ferroelectric liquid
crystals.
