中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 23 No. 9 September 2013 |
(1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China;
2. School of Mechanical & Automotive Engineering,
South China University of Technology, Guangzhou 510640, China;
3. Yiwu Industrial and Commercial College, Yiwu 322000, China)
Abstract:With the rapid rising of heat flux and reduction of heat dissipating space of microelectronic devises, flattened sintered heat pipe has become an ideal conducting element of use in the electronic cooling field. A manufacturing technology named phase change flattening process is presented to fabricate the flattened grooved-sintered wick heat pipe (GSHP for short). Deformation geometry of flattened GSHP and the elasto-plastic deformation of flattening process are analyzed theoretically and verified by experiments. The results show that the vapor pressure inside sintered heat pipe during flattening process is determined by the saturated vapor pressure equation; the width and vapor area of flattened heat pipe change greatly as the flattening proceeds; the maximum equivalent strain distributes at the interface between wick and vapor in the flat section; the buckling phenomenon can be well eliminated when the flattening temperature reaches 480 K; phase change flattening punch load increases with flattening temperature and displacement.
Key words: heat pipe; wick; flattening; elasto-plastic deformation; buckling; vapor pressure