Article | REF: AF4081 V1

Natural convection

Authors: Guy LAURIAT, Dominique GOBIN

Publication date: July 10, 2008

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ABSTRACT

This article aims to provide the basis for an analysis of the natural convection situations most frequently encountered. It centers on the fundamentals for problem solving. External natural convection configurations (along a wall or plume) are presented, as well as mixed-convection cases, in which natural and forced convection are associated. Internal natural convection is addressed by treating the three main classes of problems: in a vertical duct, in a horizontal layer or in a cavity. These are the most frequently occurring examples of natural convection inasmuch as they have attainable analytical solutions or well-established digital-simulation results.

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AUTHORS

Guy LAURIAT: Professor, Laboratory for the Study of Energy and Matter Transfer (LETEM), University of Marne-La-Vallée
Dominique GOBIN: Research Director, Fluids, Automation and Thermal Systems Laboratory (FAST), CNRS, University of Paris-6

INTRODUCTION

In the first article [AF 4 080] , attention was focused on establishing the fundamental equations, emphasizing the underlying assumptions and the limitations they imply.

In this second part, the most common cases of natural convection are presented, for which analytical solutions are available or numerical simulation results are well established. On the one hand, configurations of external natural convection, along a wall or in a plume, are presented, as well as examples of mixed convection, where natural and forced convection are in competition. Secondly, three main classes of internal natural convection problems are described: open channel, horizontal layer and vertical cavity.

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