Mixed convection in an open cavity with a heated wall bounded by a horizontal unheated plate is investigated experimentally. The cavity has the heated wall on the inflow side. Mixed convection fluid flow and heat transfer within the cavity is governed by the buoyancy parameter, Richardson number (Ri), and the Reynolds number (Re). The results are reported in terms of wall temperature profiles of the heated wall and flow visualization for Re = 100 and 1000, Ri in the range 30–110 (for Re = 1000) and 2800–8700 (for Re = 100), the ratio between the length and the height of cavity (L/D) is in the range 0.5–1.5 and the ratio between the channel and cavity heights (H/D) equal to 0.5 and 1.0. The present results show that the maximum dimensional temperature rise values decrease as the Reynolds and the Richardson numbers decrease. The flow visualization points out that for Re = 1000 there are two nearly distinct fluid motions: a parallel forced flow in the channel and a recirculation flow inside the cavity. For Re = 100 the effect of a stronger buoyancy determines a penetration of thermal plume from the heated plate wall into the upper channel. The dimensionless maximum wall temperatures in terms of L/D had values in ± 5% respect to an average function. Nusselt numbers increase when L/D increase in the investigated range of Richardson numbers.
ASME 2003 Heat Transfer Summer Conference
July 21–23, 2003
Las Vegas, Nevada, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-3693-2
PROCEEDINGS PAPER
Experimental Investigation on Mixed Convection in a Channel With an Open Cavity Below
Oronzio Manca
,
Oronzio Manca
Seconda Universita` di Napoli, Aversa, CE, Italy
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Sergio Nardini
,
Sergio Nardini
Seconda Universita` di Napoli, Aversa, CE, Italy
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Ruggero Pitzolu
,
Ruggero Pitzolu
Seconda Universita` di Napoli, Aversa, CE, Italy
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Kambiz Vafai
Kambiz Vafai
University of California at Riverside, Riverside, CA
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Author Information
Oronzio Manca
Seconda Universita` di Napoli, Aversa, CE, Italy
Sergio Nardini
Seconda Universita` di Napoli, Aversa, CE, Italy
Ruggero Pitzolu
Seconda Universita` di Napoli, Aversa, CE, Italy
Kambiz Vafai
University of California at Riverside, Riverside, CA
Paper No:
HT2003-47132, pp. 257-267; 11 pages
Published Online:
December 17, 2008
Citation
Manca, Oronzio, Nardini, Sergio, Pitzolu, Ruggero, and Vafai, Kambiz. "Experimental Investigation on Mixed Convection in a Channel With an Open Cavity Below." Proceedings of the ASME 2003 Heat Transfer Summer Conference. Heat Transfer: Volume 1. Las Vegas, Nevada, USA. July 21–23, 2003. pp. 257-267. ASME. https://doi.org/10.1115/HT2003-47132
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