Study on Inner Micro-Grooves of Heat Pipe Spinning Process and Multi-Tooth Mandrel

Li, Yong; Tang, Yong; Li, Xi Bing; Deng, Wen Jun; Zeng, Zhi Xin

doi:10.4028/www.scientific.net/kem.375-376.358

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…In one of authors' previous papers (Tang et al, 2007), the formation mechanism of the mIGCT from copper tube by oil-filled ball spinning method was analyzed, and optimal manufacturing parameters were suggested. In another paper (Li et al, 2008), the design of plug was analyzed, and some methods were proposed to avoid tube defects. So the analysis of the grooves deformation by oilfilled ball spinning method will not be included in this paper.…”

Section: Methodsmentioning

confidence: 99%

Experimental and FEM study on sinking of miniature inner grooved copper tube

Tang

Dong

et al. 2009

Journal of Materials Processing Technology

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Section: Methodsmentioning

confidence: 99%

Experimental and FEM study on sinking of miniature inner grooved copper tube

Tang

Dong

et al. 2009

Journal of Materials Processing Technology

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“…To enhance micro grooves' forming efficiency and enlarge its number and depth-width ratio as well to accelerate working fluid's back-flow and enhance grooved MHP's heat transfer performance, our project group proposed one high-speed oil-filled steel ball spinning [18][19][20][21][22] shown in Fig. 5 to fabricate circular MHPs with ultrathin-fin and ultra-deep-grooved wick.…”

Section: Forming Mechanism Of Grooved Substratementioning

confidence: 99%

Forming method of micro heat pipe with compound structure of sintered wick on grooved substrate

et al. 2015

Heat Mass Transfer

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in chips and dramatically reducing reliability and performances [1][2][3]. So thermal control has become a hot issue for the high-power electronic components with high heatflux, which urgently needs solving. Miniature/micro heat pipes have become ideal radiating devices for high heatflux chips because of their high heat conductivity and no need for extra electronic driving. As a heat pipe's heat transfer performance is mainly determined by its wick structure, and the compound structure of sintered wick on a grooved substrate can have both sintered pipes' greater capillary force and grooved pipes' lower back-flow resistance to working fluid, therefore can better suit the trend of being light, thin, short and miniature for high heat-flux electronic devices [4][5][6]. But the key problems are how to fabricate ideal micro grooves in the inner wall of thin circular copper pipes to reduce the back-flow resistance to working fluid, and how to sinter a thin layer of copper powders on these micro grooves to boost capillary force, and consequently MHPs' heat transfer performances.The higher requirement for thermal control in so many industries has attracted more scholars to research on MHPs. In recent years, Suman [7] modelled surface tension gradient for grooved MHPs, analyzed the impacts of surface tension gradient on heat pipes' performances from the perspectives of working fluid's curvature radius, pressure and velocity, and concluded that heat transfer performances can be greatly enhanced by affixing appropriate surfactant or surface charge, which can decrease surface tension gradient of working fluid in heat pipes. Oh et al. [8] proposed a technique of laser-induced thermochemical etching, which can help fabricate triangle grooves with smooth surface in copper pipes' inner wall. Xin et al.[9] fabricated loop heat pipe (LHP) wicks through cold pressing and loose powder sintering respectively, tested the porosity, permeability and pore radius of two types of wicks, and discovered that the Abstract Micro heat pipes (MHPs) with excellent heat transfer performance have been the ideal radiating components to meet increasingly higher requirements posed by high heat-flux products. Based on MHPs' working principle, this study deduced capillary limit of a novel MHP with compound structure of sintered wick on grooved substrate, and probed into its forming mechanism: first, highspeed oil-filled spinning was applied to fabricating micro grooves, with optimal spinning and drawing speeds determined; then a mini-type vibration machine was used to help fill copper powders fast and uniformly, with appropriate sintering temperature and time fixed; the manufacturing method that integrates vacuum-pumping-cold-welding with secondary-degassing-cold-welding to increase vacuumizing efficiency. The results of experiments on its heat transfer performance show that the MHPs with sinteredwick-on-grooved-substrate structure fabricated through the proposed forming method can not only acquire much better heat transfer performance, but have advantag...

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Heat Transfer Performance of Micro Heat Pipe with Trapezium-grooved Wick

Liu

Shi³

et al. 2012

2012 Fifth International Conference on Intelligent Computation Technology and Automation

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Study on Inner Micro-Grooves of Heat Pipe Spinning Process and Multi-Tooth Mandrel

Cited by 4 publications

References 5 publications

Experimental and FEM study on sinking of miniature inner grooved copper tube

Experimental and FEM study on sinking of miniature inner grooved copper tube

Forming method of micro heat pipe with compound structure of sintered wick on grooved substrate

Heat Transfer Performance of Micro Heat Pipe with Trapezium-grooved Wick

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