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Experimental investigation of the transient thermal performance of a bent heat pipe with grooved surface

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  • Wang, Junye

Abstract

A bent copper-water heat pipe with grooved inner surface has been investigated experimentally. A comparison between the bent and the straight heat pipes was performed at different inclination angle. Experimental results show that there is a small temperature difference between the condenser of the straight and that of the bent at the vertical orientation. The temperature difference increases as an inclination angle increases. Furthermore, the response time increases as the inclination angle increases. The thermal response of the straight to a sudden heat load is slightly faster than that of the bent. However, as the inclination angle increases to after the horizontal, the heat flux at the condensers decreases nonlinearly and the response time increases nonlinearly. A two-phase flow map has been proposed to explain the nonlinear performance of the thermal response and the heat flux, based on force balance among gravity, capillary, friction and buoyancy force acting on the working fluids. The nonlinear performance of the thermal response and the heat flux results from the capillary blocking due to formation of liquid bridge of two-phase flow. It was also found that the bent heat pipe is more sensitive to the change of the inclination angle than the straight in terms of the thermal response time and the heat flux of the condenser. The heat flux of the bent decreases faster than that of the straight after the horizontal orientation.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:10:p:2030-2037
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    References listed on IDEAS

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    1. Meena, P. & Rittidech, S. & Poomsa-ad, N., 2007. "Application of closed-loop oscillating heat-pipe with check valves (CLOHP/CV) air-preheater for reduced relative-humidity in drying systems," Applied Energy, Elsevier, vol. 84(5), pages 553-564, May.
    2. Meena, P. & Rittidech, S. & Poomsa-ad, N., 2007. "Closed-loop oscillating heat-pipe with check valves (CLOHP/CVs) air-preheater for reducing relative humidity in drying systems," Applied Energy, Elsevier, vol. 84(4), pages 363-373, April.
    3. 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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    5. Luo, Xianglong & Yi, Zhitong & Zhang, Bingjian & Mo, Songping & Wang, Chao & Song, Mengjie & Chen, Ying, 2017. "Mathematical modelling and optimization of the liquid separation condenser used in organic Rankine cycle," Applied Energy, Elsevier, vol. 185(P2), pages 1309-1323.
    6. Sarafraz, M.M. & Pourmehran, O. & Yang, B. & Arjomandi, M., 2019. "Assessment of the thermal performance of a thermosyphon heat pipe using zirconia-acetone nanofluids," Renewable Energy, Elsevier, vol. 136(C), pages 884-895.

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