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Effect of Surface Roughness on Two-Phase Flow Heat Transfer by Confined Liquid Impinging Jet  

Yim, Seong-Hwan (Graduate School of Mechanical Engineering, Yonsei University)
Shin, Chang-Hwan (Graduate School of Mechanical Engineering, Yonsei University)
Cho, Hyung-Hee (School of Mechanical Engineering, Yonsei University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.8, 2005 , pp. 714-721 More about this Journal
Abstract
The water jet impingement cooling with boiling is one of the techniques to remove heat from high heat flux equipments. The configuration of surface roughness is one obvious condition of affecting the performance on heat transfer in nucleate boiling, The present study investigates the water jet impinging single-phase convection and nucleate boiling heat transfer for the effect of surface roughness to enhance the heat transfer in free surface and submerged jet. The distributions of the averaged wall temperature as well as the boiling curves are discussed. Jet velocities are varied from 0.65 to 1.7 m/s. Surface roughness by sand blast and sand paper varies from 0.3 to 2.51 ${\mu}m$ and cavity shapes on surface are semi-circle and v-shape, respectively The results showed that higher velocity of the jet caused the boiling incipience to be delayed more. The incipient boiling and heat transfer increase with increasing surface roughness due to a large number of cavities of uniform size.
Keywords
Confined jet; Surface roughness; Free surface; Submerged jet; Jet impingement;
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