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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v7.i2.50
13 pages

VISUALIZATION OF FLOW STRUCTURES IN NATURAL CONVECTION BETWEEN HORIZONTAL UNIFORMLY HEATED PARALLEL PLATES

Oronzio Manca
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli," Aversa (CE), Italy
Biagio Morrone
Department of Industrial and Information Technology Engineering, Università della Campania Luigi Vanvitelli, Aversa, Italy
Sergio Nardini
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli", Via Roma 29, Aversa (CE), Italy

RESUMO

This article reports on experimental visualizations of the natural convective flow between heated horizontal plates. Visualization is obtained by means of a laser light sheet and injection of incense smoke inside an open-ended cavity. The study is carried out for two different plate spacings (b = 20.0 mm and 40.0 mm) and several wall heat flux values. The corresponding Grashof number ranges between 9.80 × 103 and 1.20 × 106. Three heating modes are tested (1) both plates equally heated, (2) top plate heated and bottom one unheated, and (3) top plate unheated and bottom one heated. The symmetric heating mode shows various flow patterns as compared to the asymmetric heating modes (i.e., bottom or top heating plate heated) depending on the distance between the plates. Several secondary motions are detected inside the open-ended cavity at different positions from the inlet edge.