According to current engineering hydrodynamics, there s positively constant head loss in Bernoulli s theorem for identical stream line in viscous fluid, which can later turn into heat and dissipate.

• 现行工程流体力学与水力学理论通常认为粘性流体元流伯努利方程中的水头损失项是恒正的,并且这部分损失的机械能转变为热而耗散掉了。