Heat/mass transfer measurement on concave surface in rotating jet impingement |
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Authors: | Sung Kook Hong Dong Hyun Lee Hyung Hee Cho |
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Affiliation: | (1) Department of Mechanical Engineering, Yonsei University, Seoul, 120-749, Korea |
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Abstract: | The objective of this paper is to investigate the heat/mass transfer characteristics on a concave surface for rotating impinging
jets. The jet with Reynolds number of 5,000 is applied to the concave surface and the flat surface, respectively. The rotating
experiments have been carried out at the rotating speed of 560RPM which is corresponding to Ro number of 0.075. The two jet
orientation (front and trailing orientation) are considered. Detailed heat/mass transfer coefficients on the target plate
were measured using a naphthalene sublimation method. The result indicates that the rotation leads to change in local heat/mass
transfer distributions and the slight increase in the Sh level. The front orientation induces asymmetric Sh distributions,
whereas the trailing orientation shows the shifted heat/mass transfer feature due to rotation-induced flow behavior. The crossflow
effect on heat/mass transfer is also observed as the streamwise direction increases. Compared to flat surface, the heat/mass
transfer on the concave surface is enhanced with increasing the spanwise direction due to the curvature effect, providing
the higher averaged Sh value. It is proved that the difference of surface geometry affects somewhat the local and averaged
heat/mass transfer regardless of rotation condition.
This paper was presented at the 9th Asian International Conference on Fluid Machinery (AICFM9), Jeju, Korea, October 16–19, 2007. |
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Keywords: | Impinging jet Heat/mass transfer Naphthalene sublimation method Rotation Concave surface |
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