The amount of friction depends on the fluid viscosity and the velocity gradient (that is, the relative velocity between fluid layers). The velocity gradients are set up by the no-slip condition at the ...

IN your review of the report of M. Vallot from his observatory on Mont Blanc (p. 31) you speak of his finding that a stream ceases to increase in speed in a channel of greater incline than 3 in ...

Relative velocity’s a hell of a thing. It’s impossible to conceptualize how fast 300 kilometers per hour is until you’re on a ...