Forming method of wick structure for heat column
(1. Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institutes,
South China University of Technology, Guangzhou 510640, China;
2. Department of Mechanical Engineering,
Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou 510635, China)
South China University of Technology, Guangzhou 510640, China;
2. Department of Mechanical Engineering,
Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou 510635, China)
Abstract: The intensified boiling and condensation wick structures of heat column were designed and manufactured by ploughing-extrusion (P-E) machining method. The forming process and mechanism were analyzed. The results show that the P-E depth plays a decisive role in forming of wick structure. The larger the P-E depth is, the better the surface characteristics are. Only when the groove spacing is in a certain range, superior surface structure can be formed in the wick. The better enhancement boiling structure forms at P-E depth of 0.3 mm, ringed groove spacing of 0.4 mm, and interior angle of radial groove of 3°; the better enhancement condensation structure forms at P-E depth of 0.3 mm, ringed groove spacing of 0.4 mm, and axial grooves spacing of π/3 mm.
Key words: heat column; wick; ploughing-extrusion; heat transfer; micro-groove