With the development of mechanical and electronic equipments, thermal management problem becomes more and more challenging. In order to solve this problem, according to the bionics principle, a new structure flat heat pipe(FHP), based on the micro structure of the Calathea zebrine, using nano-scale copper powder as sintered material, is constructed with conical capillary wicks, and its thermal performance is investigated experimentally with deionized water used as the working fluid. The effect of heating power, inclination angle and capillary wicks through oxidation on thermal performance of the FHP are studied. The results show that the existence of the multi-scale pore gap of the conical capillary wicks not only realized the vapor escape from large pore gap and liquid suck from small pore gap, but also shortened the liquid flow path, and reduced the flow resistance, as well as expanded the heat transfer area, thus greatly improved the heat transfer performance of the FHP. The new structure FHP has good thermal and anti-gravity performance. Capillary wicks through oxidation can significantly reduce the FHP’s thermal resistance, improving its thermal performance, and its minimum total thermal resistance is equal to 0.079 K/W when the heat flux reaches to 107.1 W/cm2.
LI Hongchuan
,
JI Xianbing
,
ZHENG Xiaohuan
,
YANG Wolong
,
XU Jinliang
. Study on Heat Transfer Properties of Flat Heat Pipe with Conical Capillary Wicks[J]. Journal of Mechanical Engineering, 2015
, 51(24)
: 132
-138
.
DOI: 10.3901/JME.2015.24.132
[1] 史维秀, 李惟毅, 潘利生, 等. 乙醇水溶液脉动热管传热特性研究[J]. 机械工程学报, 2011, 47(24)：117-121.SHI Weixiu, LI Weiyi, PAN Lisheng, et al. Study on heat transfer properties of aqueous ethanol pulsating heat pipe[J]. Journal of Mechanical Engineering, 2011, 24：117-121.
[2] 郑军, 张光辉, 曹兴进. 热管式磁流变传动装置的设计与试验[J]. 机械工程学报, 2009, 45(7)：305-311.ZHENG Jun, ZHANG Guanghui, CAO Xingjin. Design and experiment for magnetorheological transmission device with heat pipes[J]. Journal of Mechanical Engineering, 2009, 45(7)：305-311.
[3] HANSEN G, NAESS E, KRISTJANSSON K. Sintered nickel powder wicks for flat vertical heat pipes[J]. Energies, 2015, 8(4)：2337-2357.
[4] PENG Y, LIU W Y, WANG N L, et al. A novel wick structure of vapor chamber based on the fractal architecture of leaf vein[J]. International Journal of Heat And Mass Transfer, 2013, 63：120-133.
[5] POPOVA N, SCHAEFFER C, AVENAS Y, et al. Fabrication and thermal performance of a thin flat heat pipe with innovative sintered copper wick structure[C]// Conference Record of the 2006 IEEE Industry Applications Conference, Forty-First Ias Annual Meeting, 2006：791-796.
[6] KIM S S, WEIBEL J A, FISHER T S, et al. Thermal performance of carbon nanotube enhanced vapor chamber wicks[C]//Proceedings of the Asme International Heat Transfer Conference, 2010, 5：417-424.
[7] CAI Q J, CHEN C L. Design and test of carbon nanotube biwick structure for high-heat-flux phase change heat transfer[J]. Journal of Heat Transfer-Transactions, 2010, 132(5)：689-694.
[8] VADAKKAN U, CHRYSLER G M, MAVEETY J. A novel carbon nano-tube based wick structure for heat pipes/vapor chamber[J]. Semiconductor Thermal Proceedings, 2007(18-22)：102-104.
[9] WEIBEL J A, GARIMELLA S V, MURTHY J Y, et al. Design of integrated nanostructured wicks for high-performance vapor chambers[J]. IEEE Transactions on Components Packaging and Manufacturing Technology, 2011, 1(6)：859-867.
[10] LEFEVRE F, LALLEMAND M. Coupled thermal and hydrodynamic models of flat micro heat pipes for the cooling of multiple electronic components[J]. International Journal of Heat and Mass Transfer, 2006, 49(7-8)：1375-1383.
[11] 纪献兵, 徐进良, ABANDA A M, 等. 超轻多孔泡沫金属平板热管的传热性能研究[J]. 中国电机工程学报, 2013(33)：72-79．JI Xianbing, XU Jinliang, ABANDA A M, et al. Investigation on heat transfer performance of flat heat pipes with ultra-light porous metal foam wicks[J]. Proceedings of the CSEE, 2013(33)：72-79.
[12] LU M, MOK L, BEZAMA R J. A graphite foams based vapor chamber for chip heat spreading[J]. Journal of Electronic Packaging, 2006, 128(4)：427-431.
[13] CHIEN L H, SIH Y C. An experimental study of mesh type flat heat pipes[J]. Journal of Mechanics, 2011, 27： 167-176.
[14] WU S C, WANG D, GAO J H, et al. Effect of the number of grooves on a wick’s surface on the heat transfer performance of loop heat pipe[J]. Journal of Applied Thermal Engineering, 2014, 71：371-377.
[15] LIPS S, LEFEVRE F, BONJOUR J. Combined effects of the filling ratio and the vapour space thickness on the performance of a flat plate heat pipe[J]. International Journal of Heat And Mass Transfer, 2010, 53(4)：694-702.
[16] WANG X W, TANG Y, CHEN P. Investigation into performance of heat pipe with micro grooves fabricated by extrusion-ploughin process[J]. Energy Conversion and Management, 2009, 50(5)：1384-1388.
[17] SATO O, KUBO S, GU Z Z. Structural color films with lotus effects, super hydrophilicity, and tunable stop-bands[J]. Accounts of Chemical Research, 2009, 42(1)：1-10.
[18] ZHANG J L, SEVERTSON S J. Fabrication and use of artificial superhydrophilic surfaces[J]. Journal of Adhesion Science and Technology, 2014, 28(8-9)：751-768.
[19] WONG S C, CHEN C W. Visualization experiments for groove-wicked flat-plate heat pipes with various working fluids and powder-groove evaporator[J]. International Journal of Heat and Mass Transfer, 2013, 66：396-403.
