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논문 기본 정보

자료유형
학술대회자료
저자정보
김우경 (Korea Adcanced Institute of Science and Technology) 김성진 (Korea Adcanced Institute of Science and Technology)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2016년도 학술대회
발행연도
2016.12
수록면
332 - 336 (5page)

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As modern electronics become smaller and more densely packed, there is a strong demand for high intensity heat dissipation in compact spaces. Pulsating heat pipes(PHPs) are one of the promising two-phase heat transfer devices for modern electronic systems. Previous researchers reported that obvious nucleation occurred during startup period. They also reported that temperature during startup is quite bigger than operation period which is after the startup period. However, study have not been performed to reduce wall superheat and temperature of PHPs during operation. Through design artificial cavities in channels of PHPs it can be expected to act as nucleation sites. In this study, experiments were performed to investigate the effect of artificial cavities on thermal and flow characteristics of flat plate micro pulsating heat pipes(MPHPs). Silicon-based PHPs with hydraulic diameter of 667 μm and 5 turns were fabricated using MEMS techniques. Ethanol was used for working fluid of PHPs and filling ratio of working fluid was fixed to 50 % in all experiments. To figure out flow and thermal characteristics of PHPs, flow visualization was conducted using high speed camera. Artificial cavities were structured between microchannel and wall. They were shown to promote nucleation of bubbles and to support startup MPHPs. Results showed not only decrease of operation temperature and wall superheat of PHPs but also increase of thermal performance of PHPs. Through experimental results, better design of PHPs for thermal.

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Abstract
1. 서론
2. 실험 장치 및 방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2017-550-002056004