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research article

Modified Wilson Plots for Enhanced Heat Transfer Experiments: Current Status and Future Perspectives

van Rooyen, E.
•
Christians, M.
•
Thome, J. R.  
2012
Heat Transfer Engineering

Heat transfer coefficients for enhanced tubes are typically measured indirectly using the "Wilson plot" method to first characterize the thermal performance of the one side (heating or cooling supply) and then to obtain the heat transfer data for the enhanced side based on the Wilson plot results. A brief history of the Wilson plot evolution and alternative methods to the Wilson plot, including the advantages and disadvantages, are discussed as applied for enhanced heat transfer. A slight modification to the Briggs and Young (1969) method is proposed so that the experimental errors can be propagated through the method, allowing us to estimate the error in the generated correlations. Furthermore, a new method based on unconstrained minimization is proposed as an alternative to the least-squares regression. As an example, both methods have been applied to two enhanced boiling tubes (the most recent generation) and heat transfer coefficients were compared against direct wall temperature based heat transfer coefficient measurements made on the same tubes for water flow with high-performance internal helical ribs. Both the unconstrained minimization method and the modified Briggs and Young (1969) method performed well and predicted the same heat transfer performance within experimental uncertainty for two databases taken on two different experimental facilities. Furthermore, if the presently modified Wilson plot method is utilized, and the form of the correlating equation is chosen judiciously and is only applied within the range of experimental conditions tested, the results garnered from the analysis can very adequately predict the local heat transfer performance.

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Type
research article
DOI
10.1080/01457632.2012.611767
Web of Science ID

WOS:000302011900004

Author(s)
van Rooyen, E.
•
Christians, M.
•
Thome, J. R.  
Date Issued

2012

Published in
Heat Transfer Engineering
Volume

33

Start page

342

End page

355

Subjects

Transfer Coefficients

•

Tubes

•

Condensation

•

R-134A

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTCM  
Available on Infoscience
May 4, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/80015
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