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A study of fundamental and application of high efficiency boiling and evaporation utilizing controlled liquid supply of ink-jet type

喷墨式控液高效沸腾蒸发原理及应用研究

基本信息

批准号：
18360107
负责人：
SHOJI Masahiro
金额：
$ 10.34万
依托单位：
Kanagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

In relation to the cooling of highly-integrated electronic devices and thermal equipments, cooling systems of small size with high efficient and high performance are strongly demanded. In order to realize the high heat flux cooling systems with the cooling performance over the heat flux of several tens MW/m^2 and apply the systems to the evaporators and refrigerators, systematic and fundamental experiment of subcooled boiling novel systems by supplying jet-type liquid and controlling the size of droplets, impinging velocity and number of the droplets. In the first research period of 2006, fundamental heat transfer characteristics of a single impinging jet and droplet were investigated in detail at reduced pressures by changing the rate of supply liquid. The heat transfer surface was finished by he sand paper of #400. In order to enhance the heat transfer, Thermo-excel of HITACH Ltd. Was attached onto the copper surface. In the second research period of 2007, boiling performance was studied for multiple jets and for nano-tube soldered heat transfer surface. As the results of those experiments, it is found that even if the liquid supply rate is low, sufficiently high heat transfer is able to be obtained and that car-bon-nanotube surface shows good heat transfer performance, contrary to the common knowledge. These results and ideas were successfully applied to the development of ultra-small-size absorption type cooler with high performance which was performed as a high-tech research project at AIST (Institute of Advanced Industrial Science and Technology), Tukuba.

在高集成度电子器件和散热设备的散热方面，对小尺寸、高效率、高性能的散热系统提出了更高的要求。为了实现冷却性能在几十mW/m2以上的高热流密度制冷系统，并将其应用于蒸发器和冰箱，通过提供射流液体，控制液滴大小、撞击速度和液滴数量，对新型过冷沸腾系统进行了系统的基础实验。在2006年的第一个研究阶段，通过改变供液速度，详细研究了减压条件下单个冲击射流和液滴的基本换热特性。换热面用400号砂纸打磨。为了强化换热，在铜表面贴附了HITACH公司的Thermo-EXCEL。在2007年的第二个研究阶段，对多股射流和纳米管焊接换热表面的沸腾性能进行了研究。实验结果表明，即使液体供应速率较低，也能获得足够高的换热，碳纳米管表面表现出良好的换热性能，这与一般的认识相反。这些成果和想法被成功地应用于图库巴高级工业科学技术研究所(AIST)的高技术研究项目--超小型高性能吸收式制冷机的开发。