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Physical Hydrodynamics, 2nd Edn$
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Etienne Guyon, Jean-Pierre Hulin, Luc Petit, and Catalin D. Mitescu

Print publication date: 2015

Print ISBN-13: 9780198702443

Published to Oxford Scholarship Online: March 2015

DOI: 10.1093/acprof:oso/9780198702443.001.0001

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Coupled Transport. Laminar Boundary Layers

Coupled Transport. Laminar Boundary Layers

(p.363) 10 Coupled Transport. Laminar Boundary Layers
Physical Hydrodynamics, 2nd Edn

Etienne Guyon

Jean-Pierre Hulin

Luc Petit

Catalin.D. Mitescu

Oxford University Press

The combined effects of diffusion, convection, and of chemical reactions, involve length scales which characterize their relative efficiency. The boundary layer around a solid body appears in laminar flows at high Reynolds numbers and is shown frequently to have a self-similar structure. Adverse pressure gradients in the direction of the flow are shown to induce a boundary-layer separation which plays an essential role in aerodynamics. Laminar wakes behind an obstacle are also discussed. Temperature or concentration gradients near the surface of solid bodies may also create thermal, or mass-transfer boundary layers: examples of applications in thermal, or chemical, engineering, like in the case of electrodes are discussed. The end of the chapter deals with combustion problems like diffusion and premixed flames in which chemical reactions, and the corresponding thermal effects must be taken into account.

Keywords:   boundary layers, Prandtl equation, Blasius flow, self-similarity, boundary layer separation, aerodynamics, thermal and mass boundary layers, polarography, combustion, Taylor dispersion

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