Forming mechanism of three-dimensional integral fin based on flat surface

• Published in: Journal of Central South University Vol. 22; no. 5; pp. 1660 - 1666
• Main Authors: Xiang, Jian-hua, Duan, Ji-an, Zhou, Hai-bo, Zhang, Chun-liang, Liu, Gui-yun, Zhou, Chao
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.05.2015
• Subjects: Engineering; Metallic Materials; three-dimensional integral fin; enhanced boiling; stamping; ploughing-extrusion; micro groove
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-015-2684-6

To improve heat-transfer performance, a novel integral three-dimensional fin-structure on the plat surface was presented to increase the evaporation efficiency. The three-dimensional fin-structure is composed of a spiral micro-groove and multi radial micro-grooves. Both ploughing-extrusion (P-E) and stamping were used to form the integral-fins with a connection between radial and circumferential directions. Based on the SEM results, the relationships among P-E speed v P-E , rotational speed n p and feed f p , and among interference length L i , stamping feed angle θ c and stamping depth a c were analyzed. The effects of processing parameters on the groove morphology and the matching relationship between parameters were also discussed. The integral finned surface with micro-grooves and cracks can be obtained under such processing conditions: P-E depth a p =0.3 mm, a c =0.3 mm, the interval of helical groove d p =1.24 mm, θ c =2° and n p =50 r/min.