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Analysis of pressure fluctuations to evaluate thermal performance of oscillating heat pipe

Author

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  • Nine, Md J.
  • Tanshen, Md. Riyad
  • Munkhbayar, B.
  • Chung, Hanshik
  • Jeong, Hyomin

Abstract

The oscillations of liquid slugs and vapor plugs inside an oscillating heat pipe (OHP) are captured and shown in terms of pressure frequency spectrum. Pressure fluctuation inside a single loop OHP between the evaporative and the condensing sections is analyzed to evaluate thermal performance. De-Ionized (DI) water and Cu/water nanofluid with different mass fractions (0.5 wt%, 1 wt%, 2 wt% and 3 wt%) are studied subjected to the evaporative heat load of 20–120 W. Swirling, bubble creation and bubble growth phenomena are observed inside OHP integrated with circulation and oscillating motion of vapor plug and liquid slug. Furthermore, deposition of nanoparticles is found on the surface of the evaporative section of OHP when charged with nanofluid. Experimental results show that Cu/Water nanofluid containing 2 wt% of Cu nanoparticles facilitates lowest thermal resistance and highest magnitude of pressure fluctuation inside OHP. Maximum 22% efficiency is achieved by Cu/Water nanofluid with 2 wt% of Cu nanoparticles at 80 W of evaporative power input. However, thermal performance is found significantly interrelated with inside pressure fluctuation of OHP. Cu/water nanofluid is found to promote circulation and oscillation of the liquid slug and the vapor plug rather than reinforcing bubble formation and bubble growth inside OHP.

Suggested Citation

  • Nine, Md J. & Tanshen, Md. Riyad & Munkhbayar, B. & Chung, Hanshik & Jeong, Hyomin, 2014. "Analysis of pressure fluctuations to evaluate thermal performance of oscillating heat pipe," Energy, Elsevier, vol. 70(C), pages 135-142.
    • Handle: RePEc:eee:energy:v:70:y:2014:i:c:p:135-142
    DOI: 10.1016/j.energy.2014.03.098
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    References listed on IDEAS

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    1. Qu, Jian & Wang, Qian, 2013. "Experimental study on the thermal performance of vertical closed-loop oscillating heat pipes and correlation modeling," Applied Energy, Elsevier, vol. 112(C), pages 1154-1160.
    2. Rittidech, S. & Pipatpaiboon, N. & Terdtoon, P., 2007. "Heat-transfer characteristics of a closed-loop oscillating heat-pipe with check valves," Applied Energy, Elsevier, vol. 84(5), pages 565-577, May.
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    Cited by:

    1. Jiaqiang, E. & Zhao, Xiaohuan & Liu, Haili & Chen, Jianmei & Zuo, Wei & Peng, Qingguo, 2016. "Field synergy analysis for enhancing heat transfer capability of a novel narrow-tube closed oscillating heat pipe," Applied Energy, Elsevier, vol. 175(C), pages 218-228.
    2. Xiaohuan Zhao & Yue Zhu & Hailiang Li, 2022. "Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review," Energies, MDPI, vol. 15(19), pages 1-29, October.
    3. Han, Hua & Cui, Xiaoyu & Zhu, Yue & Xu, Tianxiao & Sui, Yuan & Sun, Shende, 2016. "Experimental study on a closed-loop pulsating heat pipe (CLPHP) charged with water-based binary zeotropes and the corresponding pure fluids," Energy, Elsevier, vol. 109(C), pages 724-736.
    4. Jose Loyola-Fuentes & Luca Pietrasanta & Marco Marengo & Francesco Coletti, 2022. "Machine Learning Algorithms for Flow Pattern Classification in Pulsating Heat Pipes," Energies, MDPI, vol. 15(6), pages 1-20, March.
    5. Spinato, Giulia & Borhani, Navid & Thome, John R., 2015. "Understanding the self-sustained oscillating two-phase flow motion in a closed loop pulsating heat pipe," Energy, Elsevier, vol. 90(P1), pages 889-899.

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