Numerical calculations of laminar flow of an incompressible fluid through an axisymmetric sudden expansion followed by a curved pipe recently done by the authors discovered an early instability of this flow for a certain expansion ratio, as it becomes unsteady with periodic oscillations of the flow variables at a Reynolds number when both curved pipe flow and flow in a straight pipe with an axisymmetric sudden expansion remain stable. This study describes in detail the created oscillatory flow and suggests that the early instability of the ratio 3 flow could be caused by the higher velocity gradient near the outer wall of the bend.
Instability of a Curved Pipe Flow With a Sudden Expansion
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 11, 2015; final manuscript received July 17, 2016; published online October 18, 2016. Assoc. Editor: Samuel Paolucci.
Shusser, M., Ramus, A., and Gendelman, O. (October 18, 2016). "Instability of a Curved Pipe Flow With a Sudden Expansion." ASME. J. Fluids Eng. January 2017; 139(1): 011203. https://doi.org/10.1115/1.4034364
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