题目内容

The speed of the flow of the fluid，which in steam turbines is produced by a fall in pressure of the steam from the boiler.

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A turbine is a rotary engine which is driven by a stream of fluid (liquid or gas) directed on to the blades of the stator (定子).

Molecular activity gives the rise to an apparent shear stress in gases which is more important than the cohesive forces and since molecular activity increases with temperature，the viscosity of a gas also increases with temperature.

The viscosity of a gas decreases with temperature，but the viscosity of a liquid increases with temperature.

Newton's law of viscosity states that for a given rate of angular deformation of fluid the shear stress is directly proportional to the viscosity.