A study of Nusselt number distributions in a curved channel.
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Author
Schallert, Anthony R.
Date
1992-06Advisor
Ligrani, Phillip M.
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Show full item recordAbstract
The effects of curvature and the resulting centrifugal instabilities on local heat transfer distributions are
studied in a curved channel with a rectangular cross section and a 40 to 1 aspect ratio at Dean numbers
from 100 to 278. The experimental conditions are identified for which forced convection with weak
buoyancy, and forced convection with strong buoyancy are present. With weak buoyancy effects present
(Re2/Gr > 50 x 10-6
) a new method is developed to deduce forced convection Nusselt numbers without the
influence of natural convection. Resulting data provide information on the influence of Dean vortex pair
and their secondary flows. For a Dean number of 275, Nusselt numbers measured on the concave surface
are higher than the ones on the convex surface through out the curved portion, for X/D from 130 to 230,
where X is the distance from the start of the heated section, and D is the width of the channel. For Dean
numbers from 175 to 250, Nusselt numbers are higher on the concave surface than on the convex surface
for X/D from 160 to 230, such that differences increase with Dean number.
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