In car engines, the shiny piston walls are now cross hatched to create a matted surface. The engine oil will stick to it instead of beading on it. Creating a well oiled machine.The effect of groove texture patterns on piston-ring pack frictionhttp://sam.ensam.eu/bitstream/handle/10985/7478/MSMP_JPE_2012.pdf?sequence=3
It would be interesting to apply this investigation method to liquids with less viscosity (water), any student out there looking for a subject ?
But for the time being, lets's use the boardlady proven method.