Analysis of flow and heat transfer over louvered fins in compact geometries
The louvered fin is most widely used in automotive applications. Compared to other geometrical parameters ofthe fin, the louver angle has a stronger effect on heat transfer. This study is carried out by computational method to determine the louver inclination of a rectangular channel heat exch...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7476/1/24p%20YONG%20KOK%20WEE.pdf http://eprints.uthm.edu.my/7476/2/YONG%20KOK%20WEE%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7476/3/YONG%20KOK%20WEE%20WATERMARK.pdf |
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| Summary: | The louvered fin is most widely used in automotive applications. Compared
to other geometrical parameters ofthe fin, the louver angle has a stronger effect on
heat transfer. This study is carried out by computational method to determine the
louver inclination of a rectangular channel heat exchanger that has the greatest
influence on flow and heat transfer and invariant with other geometrical parameters.
The meshed CAD model is validated with an established correlation in literature. In
the earlier years of study, the mean flow angle was defined in two dimensional
flows. ANSYS-CFD is capable of defining a mean flow angle was defined in three
dimensional flows. The validation agrees weB, with about 5.39% of error. Various
graphs are plotted to determine the optimized louver inclination. From the plotted
graphs ofNusselt number and pumping power against the Reynolds Number, it is
observed that the louver angle has a strong influence on the heat transfer rate. Then,
a ratio of heat transfer rate to pumping power is used in the graphs as the non�dimensional number representation to determine the optimum angle. In addition to
this study, a general correlation is developed to represent the behavior oflouver
angle at different ranges of pumping power. With a practical range of Reynolds
numbers and louver angles, the optimum angle is found to be 20 degrees. This
numerical result has a high confidence level where a good agreement between the
meshed models with the established finding is obtained. The study has succeeded in
obtaining the result that was set out as the objective. |
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