지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 방광현
- 발행연도
- 2021
- 저작권
- 한국해양대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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Electronic devices are gradually becoming smaller in size and the heating spot is also becoming smaller. The Micro Pulsating Heat Pipe(MPHP) is an efficient device to dissipate heat from the miniaturized heating surface. In the present study, experiments and simulations were conducted in order to design high performance MPHP. Thermal performance experiments were conducted to investigate the variables that can influence the design of MPHP. The temperature of the heating part was fixed at 75℃ and the temperature of cooling part was fixed at 23℃.
The MPHPs for test were made by micro milling technology. MPHPs were machined in two types of square channels with a channel side length of 800 and 600 μm. The number of turns were five and nine. For working fluid, FC-72 was employed in this study because of its chemically stable characteristics for electronic device. The base charging ratio was 60% and an optimum charging ratio was saught. Flow visualization using high_speed camera was recorded to study the flow motion. The circulation and pulsating motions were observed in the experiment.
Heat transfer rate increased as the channel size increased or the number of turns increased. The optimum charging ratio for high cooling performance was found to be 60%. Copper plate MPHP showed better heat transfer performance than that of the aluminum plate MPHP. When MPHP alignment angle was found to be vertical, the performance of heat transfer was higher.
Numerical simulations of MPHP using ANSYS Fluent were carried out. The calculated heat transfer reat were in good agreement with the experimental data. The simulation results also provided an insight to better understand the mechanism of MPHP
The MPHPs for test were made by micro milling technology. MPHPs were machined in two types of square channels with a channel side length of 800 and 600 μm. The number of turns were five and nine. For working fluid, FC-72 was employed in this study because of its chemically stable characteristics for electronic device. The base charging ratio was 60% and an optimum charging ratio was saught. Flow visualization using high_speed camera was recorded to study the flow motion. The circulation and pulsating motions were observed in the experiment.
Heat transfer rate increased as the channel size increased or the number of turns increased. The optimum charging ratio for high cooling performance was found to be 60%. Copper plate MPHP showed better heat transfer performance than that of the aluminum plate MPHP. When MPHP alignment angle was found to be vertical, the performance of heat transfer was higher.
Numerical simulations of MPHP using ANSYS Fluent were carried out. The calculated heat transfer reat were in good agreement with the experimental data. The simulation results also provided an insight to better understand the mechanism of MPHP
목차
제 1 장 서론 11.1 연구배경 11.2 연구목적 2제 2 장 선행연구고찰 42.1 히트파이프 특성 42.2 진동형 히트파이프 유동특성 62.3 관 내경과 턴 수에 관한 영향 72.4 수평 설치 시 마이크로 진동형 히트파이프 작동 연구 112.5 진동형 히트파이프 해석 연구 12제 3 장 진동형 히트파이프 특성 실험 163.1 실험장치 및 실험방법 163.2 FC-72 degassing 233.3 실험 결과 및 고찰 273.3.1 유동 가시화 273.3.2 열전달률 343.3.3 냉매 충진률 영향 353.3.4. 재료 특성 영향 363.3.5. 설치 각도 영향 403.3.6. 이중 채널 크기 효과 42제 4 장 진동형 히트파이프 전산해석 474.1 서론 474.2 지배방정식 474.3 해석 도메인 형상과 격자 494.4 초기값 및 경계조건과 해석방법 504.6 결과 및 고찰 524.6.1. 전산해석 유동 양상 524.6.2. 열전달률 비교 52제 5 장 결론 60참고문헌 62
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