4.7 Article

Experimental study on heat transfer properties of gravity heat pipes in single/hybrid nanofluids and inclination angles

Journal

CASE STUDIES IN THERMAL ENGINEERING
Volume 34, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.csite.2022.102064

Keywords

Heat pipe; Inclination angle; Nanofluid; Two-phase flow; Heat transfer characteristics

Categories

Funding

  1. Fundamental Research Funds for the National Natural Science Foundation of China [52006008, 62033014, 11801029]
  2. Basic and Applied Basic Research Fund of Guangdong [2019A1515110743]
  3. Central Universities of China [FRF-TP-18-074A1, FRF-BD-20-09A, FRF-BD-20-02A]
  4. Youth Teacher International Exchange Growth Program [QNXM 20210030]

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This paper investigates the thermal conductivity performance of different nanofluids in a gravity heat pipe at different inclination angles, and finds that the hybrid nanofluid with the same mass fraction can enhance heat transfer efficiency compared to a single nanofluid.
In order to meet the working requirements of heat pipes under complex working conditions and high heat flux density, and propose corresponding thermal management solutions. In this paper, the single and hybrid nanofluids (TiO2-H2O, Al2O3-H2O, Al2O3+TiO2-H2O) with mass fraction of 5% under the gradient of gravity heat pipe at 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees are studied. The changes in thermal resistance, thermal efficiency and equivalent heat transfer coefficient of water were compared with deionized water. The results are as follows: The overall efficiency of gravity heat pipe ranges from 70% to 85%. Compared with deionized water, the nanofluid can effectively improve the heat transfer. At different inclination angles, the hybrid nanofluid with the same mass fraction shows the reverse trend compared with the single nanofluid by decreasing the thermal resistance of the heat pipe and increasing the heat transfer efficiency. At an inclination angle of 70 degrees, the heat transfer efficiency of the nanofluid Al2O3+TiO2-H2O is 6.8% weaker compared to TiO2-H2O and 4.5% weaker compared to Al2O3-H2O. At a tilt angle of 60 degrees, the heat transfer capacity of Al2O3+TiO2-H2O nanofluid increases by 7.3% compared to TiO2-H2O and by 5.6% compared to Al2O3-H2O.

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