• 제목/요약/키워드: CPL heat pipe

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소형 CPL 히트파이프를 이용한 전자장치 냉각 기술 (Cooling Technique for Electronic Equipments using a small scale CPL heat pipe)

  • 강상우;이윤표
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.1241-1246
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    • 2004
  • The heat flux on a chip is rapidly increasing with decreasing the size of one. It is necessary to properly cool the high heat flux chip. One of the promising cooling methods is to apply CPL heat pipes with porous materials, for example PVA, polyethylene, and powder sintered metal plate and with microchannels in the evaporator. A small scale CPL heat pipe with PVA as wick was designed and manufactured. Since the height difference between the evaporator and the condenser is a crucial parameter in the CPL heat pipes, the performance of the heat pipes depending on the parameter was investigated. The parameter is higher the performance is better. However, the improvement rate of the performance does not increase the increase rate of the height. In addition to, the parameter effect depending on heat input was investigated.

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소형 CPL 히트파이프의 제작 및 작동 특성에 관한 기초연구 (A fundamental Study on the Manufacturing and Operating Characteristics of a Small Scale CPL Heat Pipe)

  • 안영길;유성열;임광빈;김철주
    • 에너지공학
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    • 제12권1호
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    • pp.17-22
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    • 2003
  • 본 연구는 소형 CPL히트파이프의 제작 및 작동 특성에 대한 기초 지식을 얻기 위하여 수행되었다. CPL 히트파이프는 중력장 내에서 먼 거리까지 효과적으로 열을 이송할 수 있는 능력을 가지고 있다. 컴퓨터 칩에서 발생되는 열을 냉각하기 위하여 원판형 증발부로 구성된 소형 CPL을 설계 및 제작하여 그 작동 성능을 실험하였다. 두께 3mm, 직경 50mm의 원판형 청동 분발 소결 (equation omitted)를 사용하여 작동유체를 순환하기 위한 압력 구배를 얻을 수 있었으며 작동유체는 에탄올을 사용하였다. 실험은 응축부의 주위온도를 13$^{\circ}C$로 고정시킨 후 각각 다른 열부하에서의 CPL 작동 상태를 확인해 보았다.

좁아지는 유로에서의 유동 특성 (Flow Characteristics in the Converging Mini-Channels)

  • 강상우;김진호;이윤표
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.1623-1628
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    • 2004
  • Recently mini-channels or micro-channels are widely used for cooling the high density power electronic devices. Especially, the channels are used in small and high efficient equipments such as heat pipes and heat exchangers. Interfacial velocities between liquid and gas phases are very important in mini or micro-channels. In this paper, an experiment and a numerical analysis on the interfacial velocities were performed. In the experiment, the interfacial velocities which were measured by the high-speed CCD camera were about $26{\sim}33$ cm/s and the velocities increased as the inclination angle did. In the numerical experiment, CFD-ACE+, a commercial program, was used, the velocities had similar values with experimental results. As the inclination angle and the contact angle increased, the interfacial velocities did because of the surface tension which causes to move the interface. The effect of inclination angle was larger in the converging channels than in straight channels.

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