Heat and Mass Transfer Performance and Flow Characteristics of an Offset -Strip Array at Reynolds Numbers Up to 100,000
Michna, Gregory James
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https://hdl.handle.net/2142/83865
Description
Title
Heat and Mass Transfer Performance and Flow Characteristics of an Offset -Strip Array at Reynolds Numbers Up to 100,000
Author(s)
Michna, Gregory James
Issue Date
2006
Doctoral Committee Chair(s)
Jacobi, Anthony M.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Pressure drop, anemometry, particle image velocimetry, mass transfer, and heat transfer experiments are performed to investigate the performance of an offset-strip fin array in the range 10,000 < Re < 100,000. Flow diagnostics show the flow in the offset-strip fin array exhibits vortex shedding at two frequencies, depending on the location from which the vortices are being shed. The associated Strouhal numbers are approximately 0.15 and 0.20. The PIV experiments reveal the flow to be in a turbulent, vortex shedding regime. The friction factor, Sherwood number, and Nusselt number are determined by experiment to be approximately twice that predicted using the best currently available correlations and models for offset-strip fin arrays. Curve fits are provided for these data. The validity and proper use of the heat and mass transfer analogy for this geometry in this turbulent regime are discussed.
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