Video imaging brings liquid friction into focus
Geplaatst op 11 december 2009 - 12:42
Ask anyone who has had to drag a heavy object over a large distance – the bigger and heavier the object is, the harder it is to drag. This is because friction increases with size and weight for a solid, due to the contact area between object and surface being increased. When it comes to liquids, however, the picture is more complex. By filming a series of oil droplets on a surface, a group of researchers in the US has found that friction is increased if a droplet is hanging from a surface.
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