NDLI: Stability of Concave Boundary Layers: Overview of Stability Mechanism and Recent Findings

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Momayez, Ladan Dupont, Pascal Delacourt, Guillaume Peerhossaini, Hassan
Copyright Year	2008
Abstract	A series of experimental measurements of flow and heat transfer under streamwise Go¨rtler vortices shows conclusively that the local surface heat transfer rates can exceed that of the turbulent boundary layer even in the absence of turbulence. We have observed unexpected behavior of heat transfer in a laminar boundary layer on a concave wall at low nominal velocity, a configuration ignored in the literature. In this situation, precise measurements of the wall heat flux show that the heat transfer enhancement is extremely elevated, above that corresponding to the case of a turbulent boundary layer on a flat plate. The nonlinearly developing steady streamwise vortex (primary instability) heat transfer can already bridge the local laminar to turbulent heat transfer values in the absence of turbulence. The analysis shows that for a range of velocities less than a certain critical velocity, the transitional boundary layer is dominated by centrifugal instability. However, the steady streamwise vortices, like steady Taylor vortices between coaxial rotating cylinders, are susceptible to secondary instabilities of the varicose and sinuous modes. In experiments both modes appear to coexist and cause waviness of the primary streamwise vortices. Other results confirm this discussion based on analysis of the influence of a forcing upstream disturbance.
Sponsorship	Fluids Engineering Division
Starting Page	507
Ending Page	516
Page Count	10
File Format	PDF
ISBN	9780791848401
DOI	10.1115/FEDSM2008-55092
e-ISBN	0791838323
Volume Number	Volume 1: Symposia, Parts A and B
Conference Proceedings	ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Bridges (structures) Turbulence Stability Turbulent heat transfer Flat plates Vortices Flow (dynamics) Boundary layers Heat transfer Heat flux Boundary layer turbulence Cylinders
Content Type	Text
Resource Type	Article

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