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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v27.i2-4.10
pages 159-199

Turbulent Flow and Heat Transfer Modeling in a Flat Channel with Regular Highly Rough Walls

V. S. Travkin
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90024-1597
Ivan Catton
Morin, Martinelli, Gier Memorial Heat Transfer Laboratory, Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of California, Los Angeles, USA

ABSTRACT

Turbulent flow and heat transfer in a flat channel with highly rough walls is treated using porous media turbulent filtration theory. This approach yields the basis for a unified description of an enormous spectrum of roughness layer morphologies as well as a scalable treatment of diverse engineering and scientific issues. The focus of the current study is restricted to formulation of models of 2D and 3D regular roughness elements. The assigned regularity contributes to the simplification of the mathematical model as well as to closure modeling and numerical simulation. Some of the closure modeling elements were developed using experimental results. The results are then compared to theoretical and experimental studies of flow in channels with roughened walls, and with smooth walls by allowing the roughness elements to become vanishingly small. The results of simulation of different roughness element morphologies demonstrates the interdependency of the roughness layer morphology, the mathematical formulation of the problem and the transport characteristics.


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