Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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A Study on temperature behavior of pulsating heat pipe with different diameter in evaporator

증발부 내경 변화에 따른 진동형 히트파이프의 온도 거동에 관한 연구

  • Kim, Jihoon (Department of Mechanical Engineering, Sogang University) ;
  • Park, Chulwoo (Department of Mechanical Engineering, Sogang University) ;
  • Shah, Syed Abdullah (Department of Mechanical Engineering, Sogang University) ;
  • Kim, Daejoong (Department of Mechanical Engineering, Sogang University)
  • Received : 2019.01.21
  • Accepted : 2019.02.06
  • Published : 2019.04.30
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Abstract

In this study, the temperature behavior of Pulsating Heat Pipe (PHP) according to the diameter change were studied by limiting the diameter change to only the evaporator. To investigate operation of PHP in various heat input, heat input power was increased from 10 to 120 W. The results show operation can be divided into 3 regimes by temperature behavior. Thermal resistance was increased before start-up and decreased with increasing heat input. At 110 W heat input, thermal conductivity of 2 mm PHP was 8 .times higher compare to thermal conductivity of copper. Further, to investigate details of temperature behavior in higher heat input, FFT analysis was conducted. Based on the results, when the deviation of peak frequency in each section is lowest, the thermal resistance has lowest value.

Keywords

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Fig. 1. Schematic of a closed loop pulsating heat pipe

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Fig. 2. Experimental set-up: water block, cartridge heater, thermal insulation box, bath circulator, power supply, DAQ, etc.

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Fig. 3. Evaporator and condenser section temperature variation of 2 mm PHP with time in 10~120 W heat input

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Fig. 4. Evaporator and condenser section temperature variation of 2.5 mm PHP with time in 10~120 W heat input

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Fig. 5. Evaporator and condenser section temperature variation of 3 mm PHP with time in 10~120 W heat input

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Fig. 6. Evaporator and condenser section temperature variation of 2 mm PHP with time in 10~30 W heat input (regime 1)

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Fig. 7. Evaporator and condenser section temperature variation of 2 mm PHP with time in 40~50 W heat input (regime 2)

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Fig. 8. Evaporator and condenser section temperature variation of 2.5 mm PHP with time in 40~50 W heat input (regime 2)

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Fig. 9. Evaporator and condenser section temperature variation of 3 mm PHP with time in 40~50 W heat input (regime 2)

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Fig. 10. Evaporator and condenser section temperature variation of 2.5 mm PHP at 80 W heat input (regime 3)

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Fig. 11. Thermal resistance of 3 different PHPs with 10~120 W heat input

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Fig. 12. Thermal conductivity of 3 different PHPs and copper with 10~120 W heat input

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Fig. 13. Section peak frequency and thermal resistance of 2 mm PHP with 60~120 W heat input

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Fig. 14. Section peak frequency and thermal resistance of 2.5 mm PHP with 60~120 W heat input

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Fig. 15. Section peak frequency and thermal resistance of 3 mm PHP with 60~120 W heat input

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