Locally and spacially averaged heat transfer distributions in a curved channel with 40 to 1 aspect ratio for Dean numbers from 50 to 200
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Authors
Skogerboe, Paul E.
Subjects
Curved Heating Channel
Heat Transfer Coefficients
Nusselt Numbers
Dean Vortices
Centrifugal Instabilities
Heat Transfer Coefficients
Nusselt Numbers
Dean Vortices
Centrifugal Instabilities
Advisors
Ligrani, Phillip M.
Date of Issue
1990-03
Date
March 1990
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
ix, 120 p. ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This 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.