Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

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2000, Volume7

Issue 2

102 pages

Issue price - $140.00

Oronzio Manca
Dipartimento di Ingegneria Aerospaziale, Seconda Universitô degli studi di Napoli, via Roma 29, 81031 Aversa (CE), Italy

Biagio Morrone
Dipartimento di Ingegneria Aerospaziale Seconda Universita degli studi di Napoli, Via Roma 29, 81031 Aversa (CE), Italy

Sergio Nardini
DETEC, Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali Universita degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy

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.

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