送交者: gyro 于 2010-01-04, 12:49:26:
回答: “自来水流过较小管径时的压力变化”的问题 由 lightman 于 2010-01-04, 11:45:23:
If the wall of the tank is of finite thickness, and the opening radius is smaller than the wall thickness, then the hole is like a hose. The speed of the out flow depends on the hole size.
This is because there is some friction within the water.