Flow through bends will always occurs because there is not piping system in the boiler plant or power plant which only consists of straight pipes but also some bends. Bends in a piping system or perhaps duct process generate losses in pressure induced by momentum exchanges and also friction in fluid which in turn effect on alterations in flow way.
Due to the fact the length of axial bend is usually integrated with the friction reduction of straight length in the piping system or perhaps ducts process, it's practical to take away a computed equal to friction reduction in straight length which experimentally establish the factor of pressure loss in the bends. These kinds of adjusted records form empirically in the base of the loss aspect (Nb) in the bends.
The amount of pressure losses pertaining to fluid flow through bends inside circular pipe in surplus of direct pipe friction change marginally together with Reynolds numbers under 150, 000. Regarding Reynolds numbers over 150, 000, they're realistically consistent and rely only on the ratio of bend radius to the pipe internal diameter (r/D). Regarding industrial pipe, the impact of Reynolds number is minimal. The mixed influence of bend angle and the ratio of radius, with regard to velocity heads will be established in Figure 1.
|Figure 1: Flow through Bends|