  We employ time sequences of images observed with a G-band filter (4305{\AA})
by the Solar Optical Telescope (SOT) on board of Hinode spacecraft at different
latitude along solar central me-ridian to study vorticity of granular flows in
quiet Sun areas during deep minimum of solar activity. Using a feature
correlation tracking (FCT) technique, we calculate the vorticity of
granular-scale flows. Assuming the known pattern of vertical flows (upward in
granules and downward in inter-granular lanes), we infer the sign of kinetic
helicity of these flows. We show that the kinetic helicity of granular flows
and intergranular vortices exhibits a weak hemispheric preference, which is in
agreement with the action of the Coriolis force. This slight hemispheric sign
asymmetry, however, is not statistically significant given large scatter in the
average vorticity. The sign of the current he-licity density of network
magnetic fields computed using full disk vector magnetograms from the Synoptic
Optical Long-term Investigations of the Sun (SOLIS) does not show any
hemispheric preference. The combination of these two findings suggests that the
photospheric dynamo operating on the scale of granular flows is non-helical in
nature.
