Laminar-Turbulent Transition in Pipe Flow
Recently, a horizontal pipe facility has been completed in our laboratory. It has a length of 31m and an inner diameter of 40mm. A sketch of the facility is given in Fig. 1. The working fluid is water. The facility has been designed for transition studies. So, in order to maintain laminar flow up to very high Reynolds numbers, much care has been devoted to avoid any disturbances which may trigger transition. A settling chamber is used to eliminate swirl and suppress turbulence in the entrance flow by means of several honeycombs and screens. In the design of the shape of the contraction. which connects the settling chamber to the pipe, attention has been given to minimise adverse pressure gradients and to suppress the generation of (Görtler vortices.
KeywordsReynolds Number Pressure Drop Pipe Flow Settling Chamber Disturbance Velocity
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