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When a fluid is contained within a pipe or capillary tube, is it acted on by...

When a fluid is contained within a pipe or capillary tube, is it acted on by the largest force of friction near the walls or in the center of the tube diameter? Explain

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When a fluid is contained within a pipe or capillary tube, it is acted on by the largest force of friction near the walls.

The inner surface of the pipe or capillary tube offers some friction. As the layers of the fluid from the walls increases, the friction experienced decreases. So, the largest friction is experienced near the walls.

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