Locally and spacially averaged heat transfer distributions in a curved channel with 40 to 1 aspect ratio for Dean numbers from 50 to 200
Skogerboe, Paul E.
Ligrani, Phillip M.
MetadataShow full item record
The effects of curvature and the resulting centrifugal instabilities on local heat transfer distributions are studied in a curved channel at Dean numbers ranging from 50 to 200. The channel has a rectangular cross section of 1.27 cm by 50.1 cm giving an aspect ratio of 40 to 1. Flow is heated in a straight portion of the channel prior to the curved portion in order to obtain flow which is hydrodynamically and thermally fully developed. All baseline tests confirm techniques employed and qualify flow behavior. These consist of energy balance checks and comparison of results from the straight section to numerical and analytic solutions. Nusselt numbers in the curved section initially show an abrupt decrease after the imposition of the stabilizing influences of convex curvature. These are followed by a gradual increase as centrifugal instabilities and Dean vortices form and develop. Spatially resolved results also show significant surface Nusselt number variations across the span of a vortex pair, especially on the concave surface. On the convex surface, local Nusselt numbers are much more apt to be spanwise uniform.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
McKee, Robert Joe (Monterey, California. Naval Postgraduate School, 1973-06);A rectangular cross section channel, with both a straight and a curved portion, was designed and built to create the laminar secondary Taylor-Goertler vortex flow. An aerosol was used to visualize these flow patterns, ...
Investigation of heat transfer in straight and curved rectangular ducts using liquid crystals thermography Durao, Mario do Carmo (Monterey, California. Naval Postgraduate School, 1977-06);A rectangular cross section channel with both straight and curved test sections was used to investigate the effect of Taylor-Goertler vortices on the heat transfer from the curved section by comparing the results with those ...
Schallert, Anthony R. (Monterey, California. Naval Postgraduate School, 1992-06);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 ...