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Heat-transfer characteristics of a closed-loop oscillating heat-pipe with check valves

Author

Listed:
  • Rittidech, S.
  • Pipatpaiboon, N.
  • Terdtoon, P.

Abstract

The heat-transfer characteristics of this system i.e. a CLOHP/CV, depend on the ratio of check valves (Rcv), aspect ratio (Le/di) and the dimensionless parameters of the heat transfer. The CLOHP/CV used employed a copper tube with inner diameters of 1.77 and 2.03 mm. The evaporator, adiabatic and condenser lengths were equal to 50, 100 and 150 mm. The selected working fluids were water (H2O), ethanol (C2H5OH) and R123 (CHCl2CF3) with a filling ratio of 50% of total volume. The number of turns was 40. The Rcv values were 20, 8, 5 and 4. The evaporator was heated by hot water, while the condenser section was cooled by distilled water. The inclination of the CLOHP/CV used in the experiments was 90° to the horizontal, with a controlled working-temperature of 50 °C. When the system reached the steady state, the temperature and the flow rate of the cooling water were measured in order to calculate the heat-transfer rate of the CLOHP/CV. The experimental results showed that the heat-flux increases with an increase of Rcv and decreases with an increased aspect ratio. A correlation for predicting the heat-transfer rate for the heat-pipe in the vertical position has been established.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:84:y:2007:i:5:p:565-577
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    Citations

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    Cited by:

    1. Jiangchuan Yu & Sihui Hong & Sasaki Koudai & Chaobin Dang & Shuangfeng Wang, 2023. "An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels," Energies, MDPI, vol. 16(19), pages 1-18, October.
    2. 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.
    3. Xiao, Gang & Zhou, Tianxue & Ni, Mingjiang & Chen, Conghui & Luo, Zhongyang & Cen, Kefa, 2014. "Study on oscillating flow of moderate kinetic Reynolds numbers using complex velocity model and phase Doppler anemometer," Applied Energy, Elsevier, vol. 130(C), pages 830-837.
    4. Wang, Junye, 2009. "Experimental investigation of the transient thermal performance of a bent heat pipe with grooved surface," Applied Energy, Elsevier, vol. 86(10), pages 2030-2037, October.
    5. Jouhara, H. & Chauhan, A. & Nannou, T. & Almahmoud, S. & Delpech, B. & Wrobel, L.C., 2017. "Heat pipe based systems - Advances and applications," Energy, Elsevier, vol. 128(C), pages 729-754.
    6. 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.

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