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Characteristic of Evaporation Cooling in Water Droplet Impinging on Steel with Various Surface Roughness and Droplet Diameter  

Jang, C.S. (School of Mechanical Engineering, Kyungpook National University)
Sohn, C.H. (School of Mechanical Engineering, Kyungpook National University)
Chung, S.W. (School of Biosystems Engineering, Pusan National University)
Choi, W.S. (School of Biosystems Engineering, Pusan National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.19, no.3, 2006 , pp. 141-148 More about this Journal
Abstract
An experimental study is presented for water droplet impingement on a steel surface in the process of heat treatment. The objective of the present work is to examine characteristic of evaporation cooling due to surface roughness and droplet diameter under conductive heat input condition. The surface temperatures varied from $80{\sim}155^{\circ}C$, surface roughness was from $R_a=0.12{\mu}m$ to $R_a=1.14{\mu}m$ and droplet diameter was from 2.4 mm to 3.0 mm. The results show that the total evaporation time is shorter for the larger surface roughness and the smaller droplet size, the time average heat flux has maximum value for the larger surface roughness and the smaller droplet size. The total evaporation time has not influence on the nuclear boiling region.
Keywords
Water droplet impingement; Heat treatment; Characteristic evaporation cooling; Surface roughness; Droplet diameter; Conductive heat input condition; Surface temperature; Total evaporation time; Time averaged heat flux;
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