According to the principle of thermal equilibrium and piping thermorytic characteristics, the relationship between the flow velocity in the heating pipe and the greenhouse climate has been set up.

根据热平衡原理和管道散热特征，得到了热水管道加热时流速与温室环境温度的关系，建立了温室温度的控制模型。

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The limiting velocity criteria are generally adopted in the city sewer designing to control the sediment deposition in the pipe.

城市排水管道设计中，普遍采用最小流速准则控制排水管道中的泥沙淤积。

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The water flow velocity in the suction pipe, which is crucial for evaluating the performance on pumping fish, can be measured by the pumped water flow rate of the riser in an air lift pump system.

气力提升泵的水输送量反映了提升管进口的流速情况，而进口流速是衡量吸鱼效果的重要因素。

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