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REGARDS ON MIXED CONVECTION

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.20
pages 3-56

Jacques Padet
Laboratoire de Thermomécanique - UTAP Moulin de la housse, Faculté des Sciences, Université de Reims Champagne Ardenne, B.P. 1039, 51687 Reims cedex 2, France

Emilia-Cerna Mladin
University Politehnica of Bucharest, Bd. Libertatii nr. 3, bloc A2, sc. A, ap. 17, Bucharest 040127, Romania

Renato M. Cotta
Laboratory of Nano- and Microfluidics and Microsystems, LabMEMS, Mechanical Engineering Department and Nanotechnology Engineering Dept., POLI & COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, Cx. Postal 68503, Rio de Janeiro, RJ, CEP 21945-970, Brazil; Interdisciplinary Nucleus for Social Development—NIDES/CT, UFRJ, Brazil; Mechanical Engineering Department, University College London, UCL, United Kingdom

Mohammed Lachi
University of Reims Champagne-Ardenne GRESPI / Faculté des Sciences PB1039, 51687 Reims, France

Colette Padet
University of Reims Champagne-Ardenne, GRESPI/Laboratoire de Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Аннотация

This lecture aims to place again the mixed thermal convection in the center of the convection heat transfer and to emphasize three issues that arise by this approach: (i) a clear definition of the reference temperature in the Boussinesq approximation; (ii) a practical delimitation of the three convective modes, which are the forced convection (FC), mixed convection (MC) and natural (free) convection (NC); (iii) and, finally, a uniform description of the assembly FC/MC/NC in the similarity framework. Two examples are analyzed : plane and annular channels, for which analytical solutions are available. They allow a detailed illustration of the proposed answers to the above issues, and permit to define characteristic scales in mixed convection. The case of mixed convection in nanochannels is also examined.

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