Pipe friction is the resistance to flow caused by the pipe. As a general principle, it is better to use the largest practical pipe size to avoid losses in pump performance.

管道摩擦力是指由管道引起的流动阻力，作为一个常用原则，最好是使用最大的实用的管道尺寸以避免在水泵性能方面的损失。

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While fluids flow through a pipe, dynamics loses because of the surface friction of pipe.

流体流经管道时，由于管道表面的摩擦力而产生力头损失。

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Newton fluid's flowing in special pipe is analysed, it is gained that some factors affect the friction coefficient of flowing fluid in special pipe.

主要通过对流体流过非圆形直管的流动分析，得到影响非圆形直管摩擦系数的因素。

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The friction caused by the gas bubble pushing up the pipe and displacing the drilling mud used to control the pressure could have created a static charge that ignited the gas into a fireball.

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