Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Another question about Bernoulli:I expect John noticed that in the rest frame of the fluid at point A, the fluid speed is lower, ( even negative!)
The Bernoulli equation (for incompressible fluids) says that the sum of the kinetic energy density, the gravitational potential energy density, and the pressure is constant along a streamline so that if the speed DECREASES from point A to point B along a horizontal streamline, the pressure must be HIGHER at point B than at point A.
But in the rest frame of the fluid at point A, the speed is zero at point A and, thus, necessarily is higher at point B so that, in THAT frame, the pressure must be LOWER at point B than at point A.
What's up with that?
John Mallinckrodt
Cal Poly Pomona