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What is the reason that a constant drivi...

What is the reason that a constant driving force is always required for the maintenance of the flow of oil through the pipe lines in the oil refineries?

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When oil is flowing through a pipe, it flows in the from of layers. The motion of oil layers get retarded after travellig certain distance due to viscous, force acting between the oil layers. Therefore, to maintain a constant flow of oil in the pipe, a constant driving force is required .
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