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| Types of Liquid Flow |
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The flow of liquid varies with speed of the liquid inside the pipes.
Consider a pipe PQ through which a liquid flows. Let  be the velocity of particles of liquid as shown in the diagram. If all the particles have the same velocity (meaning, both magnitude and direction), then the flow of liquid is orderly i.e., two layers do not overlap. Such a liquid flow are called streamline flow. |
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| In the streamline flow of a liquid, every particle of the liquid follows the same path as the preceding particle. So, it has the same velocity (in magnitude and direction) as the preceding particle. The path of the particle is either straight or curved. Crowding of the paths or streamlines, indicates greater velocity of the liquid particles. |
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| If the flow of liquid is such that the velocity of particles change continuously and haphazardly from time to time, then less external energy is spent in maintaining its forward flow. Most of the external energy is spent in producing small whirlpools or eddies. Such eddies are seen when there is an obstacle in the path of a liquid. Such a liquid flow is called turbulent flow. |
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Mechanics of Solids and Fluids
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