How pipe bends are affect the undeveloped laminar flow? Can we get idea to find the length of undeveloped laminar flow region?
Hey, for non-oscillatory pipe flow, a good literature survey can be found here
http://kth.diva-portal.org/smash/get/diva2:515647/FULLTEXT02
Typically the Dean vortices that form in circular pipe bends lead to turbulent kinetic energy production and the flow transitions quickly to turbulent. This is the reason why orifice flow meters must be placed at a large distance depending on the bends upstream (there are standards for types of bends or successions of bends e.g. ISO
5167-1)
I hope this helps,
All the best,
Valeriu
For non-oscillatory pipe flow, a good literature survey can be found here
http://kth.diva-portal.org/smash/get/diva2:515647/FULLTEXT02
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