Free convection in a vertical channel with antisymmetrical heating is a special case that has not received a great deal of attention in the literature. Antisymmetrical heating is where the hot wall is heated above the ambient temperature by the same amount that the cold wall is cooled below the ambient, giving equal but opposing buoyancy forces inside the channel. An experimental model was constructed to study antisymmetrical heating inside an isothermally heated vertical channel. Flow visualization was used to obtain the flow field and laser interferometry was used to obtain the temperature field. Based on the measured temperature field, the local and average Nusselt numbers were determined, which were compared with numerical predictions obtained using ansys fluent. A range of Rayleigh numbers were studied for air with a Prandtl number of 0.71. The results show that an open-ended channel with antisymmetrical heating has some similarities to a tall enclosure. The average convective heat transfer can be approximated using an existing correlation for a tall enclosure from the literature.
Free Convection in Antisymmetrically Heated Vertical Channels
and Industrial Engineering,
Toronto, ON M5B 2K3,
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 19, 2013; final manuscript received August 16, 2013; published online October 25, 2013. Assoc. Editor: Patrick E. Phelan.
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Roeleveld, D., Naylor, D., and Leong, W. H. (October 25, 2013). "Free Convection in Antisymmetrically Heated Vertical Channels." ASME. J. Heat Transfer. January 2014; 136(1): 012502. https://doi.org/10.1115/1.4025269
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