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Hi everyone, hemorrhoid also known as piles is very much painful and this is caused when tissues gets enlarge, or it becomes weak etc. The tissues gets swollen that contain veins and forms hemorrhoid. This is very much critical situation as the pain is not bearable and it should be cured as soon as possible.
However, when frictional effects are small, a flow may be approximately reversible. For instance, in the flow through a large duct where the boundary layers are very thin, viscous effects are confined to a rather small region, and the fluid friction may sometimes be neglected. This is not the case for most practical flows.