简单的流体学知识,英文版这是一个有关水流为什么在窄的地方流速快,宽的地方流速慢.流速快的地方压强小,慢的地方压强大.请从物理学的角度分析,有公式更好.书上是这样讲的：howwouldwede

Question

简单的流体学知识,英文版
这是一个有关水流为什么在窄的地方流速快,宽的地方流速慢.
流速快的地方压强小,慢的地方压强大.
请从物理学的角度分析,有公式更好.
书上是这样讲的：
how would we describe the rate of flow of water through a steam or pipe?a volume flow rate is a volume divided by time,so liters per second or cubic meters per second.as the figures shows,the volume of a portion of water of length L flowing past some point in a pipe is the product of the length times the cross-sectional A,or LA.the speed with which this volume moves determines the rate of flow.
what is the rate of flow throught the pipe?to find out the rate,we divide the water's volume LA by the time interval t,which gives us LA/t.since L/t is the speed v of the water,we get therate of flow= vA.请问speed of water 跟 rate of flow 有什么区别?
就这么多问题了.

Answer 1

speed of water 是水的速度,rate of flow 是流量,水的速度是用m/s来定义的.流量是用m^3/s来定义的.它们之间的关系时 流量=水速*管子的截面积其实你说的是伯努利方程(Bernoulli equation) 流体力学中的物理方程(p/ρg...