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首页> 外文会议>IMAPS 2008 - 41st international symposium on microelectronics: bringing together the entire microelectronics supply chain >FLOW STUDY IN MAGNETIC MICRO-CHANNEL HEAT PIPE
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FLOW STUDY IN MAGNETIC MICRO-CHANNEL HEAT PIPE

机译：磁性微通道热管中的流动研究

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Since the magnetic field can provide an alternative driving force to help the condensed liquid traveling to the evaporating side of heat pipe, we can take advantage of this to enhance the performance of heat pipe. In order to enhance the performance of our next generation magnetic ferro-fluid heat pipe and further investigate the fluid motion in micro channels, experiments of a magnetic drop through a narrow passage are carried under various control parameters. The magnetic ferro-fluids we used are commercial light mineral oil-based ferro-fluids (EMG905) produced by Ferrotec Corp. The experiments have shown the process of a ferro-fiuid drop passing through narrow passages with different sizes (diameters =0.3mm, 0.5 mm and 0.8mm) under various applied magnetic field strengths. The common characteristics are recorded in details, such as drop deformation, necking down, pinch-off, separation, and the formation of a satellite drop. Although the capillary driving force drops as the size of micro-channel increases, it is easier and faster for magnetic fluid to pass through larger size of micro-channel. Therefore, an optimized size or maybe several mixed-size micro-channels of magnetic heat pipe should be adopted for better performance. In addition, initial location of the magnetic field source (a coil of electromagnet) is also an important factor to be considered when a magnetic micro-channel heat pipe is designed. Last but not least, applying magnetic field to enhance the performance of heat pipe is now possible and practical. The magnetic flow motion is interesting and should be further studied with various thermal conditions. More theoretical analysis and simulations of the new idea is currently under development and some preliminary results with experimental data will be presented.
机译：由于磁场可以提供替代的驱动力来帮助冷凝的液体流到热管的蒸发侧，因此我们可以利用它来提高热管的性能。为了增强我们的下一代磁性铁磁流体热管的性能并进一步研究微通道中的流体运动，在各种控制参数下进行了通过窄通道的磁滴实验。我们使用的磁性铁磁流体是Ferrotec Corp.生产的市售轻质矿物油基铁磁流体（EMG905）。实验表明，铁磁流体液滴通过具有不同尺寸（直径= 0.3mm， 0.5毫米和0.8毫米）在各种施加的磁场强度下。记录了共同的特征，例如跌落变形，缩颈，夹断，分离和卫星落落的形成。尽管毛细管驱动力随着微通道尺寸的增加而降低，但是磁性流体更容易，更快地通过较大尺寸的微通道。因此，为了获得更好的性能，应该采用优化尺寸的磁热管或者可能是几个混合尺寸的微热管。此外，磁场源（电磁线圈）的初始位置也是设计磁性微通道热管时要考虑的重要因素。最后但并非最不重要的一点是，施加磁场以增强热管的性能现在是可行的。磁运动是有趣的，应在各种热条件下进行进一步研究。目前正在对新想法进行更多的理论分析和模拟，并将提供一些带有实验数据的初步结果。

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