The frictional heating is calculated assuming adiabatic
boundary conditions for the bearing, i.e. power loss N is
drained by the natural side leakage Q when submerged in water
(zero value for forced flow).

The flow through the bearing can be improved by
applying axial grooves in the bearing surface (forced flow by applying a
pressure difference over the bearing). The groove dimensions and
the pressure difference needed to
obtain the intended forced flow can be calculated using the calculator
for the "hydraulic diameter".