The objective is to separate natural convection and radiation experimentally. Therefore a heat source is placed inside a closed cavity and the acceleration inside the cavity can be changed. A centrifuge is used to change the acceleration. A flat resistor etched on a printed circuit board of 10mm × 48mm, is placed in a hermetically sealed cylinder, which hangs under the arm of the centrifuge. The resistor is powered by a battery, dissipates 0,35W and has a surface temperature of 60°C at 1g. Natural convection is maintained inside the cylinder. Conduction is reduced to a negligible amount by construction of the experiment, thus convection and radiation are the main modes of heat transfer. The rotational speed of the centrifuge determines the centrifugal force in the cylinder. When the centripetal force increases, the temperature of the resistor decreases due to the increase of natural convection. The amount of radiation and total heat transfer can be determined from the experiment, so the amount of natural convection can also be determined. The experimental results are compared with the governing equations to validate the experiment. The reproducibility of the experiment is also checked.
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ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4690-3
PROCEEDINGS PAPER
Separation of Natural Convection and Radiation by Changing Rotational Acceleration Available to Purchase
Arnout Willockx,
Arnout Willockx
Ghent University, Gent, Belgium
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Gilbert De Mey,
Gilbert De Mey
Ghent University, Gent, Belgium
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Michel De Paepe,
Michel De Paepe
Ghent University, Gent, Belgium
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Boguslaw Wiecek,
Boguslaw Wiecek
Technical University of Lodz, Lodz, Poland
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Mariusz Felczak,
Mariusz Felczak
Technical University of Lodz, Lodz, Poland
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Mario De Craemer,
Mario De Craemer
Hogeschool Gent, Gent, Belgium
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Arnaud Stouff,
Arnaud Stouff
Hogeschool Gent, Gent, Belgium
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C. Van Rumst
C. Van Rumst
Hogeschool Gent, Gent, Belgium
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Arnout Willockx
Ghent University, Gent, Belgium
Gilbert De Mey
Ghent University, Gent, Belgium
Michel De Paepe
Ghent University, Gent, Belgium
Boguslaw Wiecek
Technical University of Lodz, Lodz, Poland
Mariusz Felczak
Technical University of Lodz, Lodz, Poland
Mario De Craemer
Hogeschool Gent, Gent, Belgium
Arnaud Stouff
Hogeschool Gent, Gent, Belgium
C. Van Rumst
Hogeschool Gent, Gent, Belgium
Paper No:
HT-FED2004-56632, pp. 435-442; 8 pages
Published Online:
February 24, 2009
Citation
Willockx, A, De Mey, G, De Paepe, M, Wiecek, B, Felczak, M, De Craemer, M, Stouff, A, & Van Rumst, C. "Separation of Natural Convection and Radiation by Changing Rotational Acceleration." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 1. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 435-442. ASME. https://doi.org/10.1115/HT-FED2004-56632
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