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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v10.i12.20
14 pages

FLOW VISUALIZATION AND FREE CONVECTION HEAT TRANSFER AT THE JUNCTION OF SHORT CYLINDERS MOUNTED ON A HEATED WALL

Guillaume Polidori
Laboratoire de Thermomecanique GRESPI- EA4301, Universite de Reims, 51687 Reims cedex 2, France
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

Краткое описание

Unsteady free convection in the vicinity of vertical wall-mounted insulated short cylinders is considered under isoflux thermal conditions used for wall heating. Especially, this study is aimed at analyzing how free convection heat transfer at the wall can be locally modified by the presence of a short protrusion. For this purpose, the idea is to correlate local heat transfer at a given abscissa on the wall with the flow patterns at the junction for a large range of angular cylinder positions a around this abscissa. In contrast to a circular shape, it is shown that the presence of a cylinder with sharp edges embedded in a free-convection boundary layer induces heat transfer enhancement at a given abscissa for a < 50°. It is argued that flow visualization can be a powerful technique in the understanding of the complex local heat transfer process, especially by identifying both the position of the wake separation and the rotational flow features.


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