Abstract
A wind tunnel study of the heat-transfer characteristics of surfaces with triangular profile riblets has been carried out in a two-dimensional turbulent boundary layer and the results compared with those of a smooth surface. The heat-transfer coefficient has been measured for the Reynolds number of 2.8 to 11.3×105 based on the streamwise length, covering a range of dimensionless riblet height and spacing of 6 to 60 wall units. The experimental results indicate that triangular riblets can enhance the convective heat-transfer by as much as 30% compared with the smooth surface without a penalty of increasing the drag. During the experiment, the heat loss due to thermal radiation was shown to be significant at lower Reynolds numbers. An attempt has been made to nullify this loss by heating the surrounding walls to the same temperature as the test surface.
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References
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© 1991 Springer Science+Business Media Dordrecht
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Choi, KS., Hamid, S. (1991). Heat transfer study of riblets. In: Choi, KS. (eds) Recent Developments in Turbulence Management. Fluid Mechanics and Its Applications, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3526-9_2
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DOI: https://doi.org/10.1007/978-94-011-3526-9_2
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5560-4
Online ISBN: 978-94-011-3526-9
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