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. 2019 May 23;5(5):e01627. doi: 10.1016/j.heliyon.2019.e01627

Table 6.

Summary of experimental and theoretical works related to cylindrical heat pipe with sintered wick structure using nanofluids.

Literature Desc. of Working Medium Desc. of operating parameters Critique Outcome Year
Kang et al. [64] Types of nanofluids: Ag/Water
% concentration: 1, 10, 100 ml/lit.
Particle size (nm): 10, 35		 Heat Load (W): 30, 40, 50, 60, 70 W
Surface temperature (°C): 40-70
  • o

    As compare with water at 20W, using nanofluids 70W heat load can be applied to heat pipe.

  • o

    Non linear relation with nanoparticles size and concentration.

 2009
Kumaresa et al. [65] Types of nanofluids: CuO/DI Water
% concentration: 0.5, 1.0, 1.5 wt%
Filling ratio: 34% of HP
Particle size (nm): 39.1		 Orientation (Deg.): 0-90
Heat Load (W): 10–160 W
Surface temperature (°C): 0-80
Pressure: 13.46 kPa
  • o

    Optimum title angle and weight concentration were 45° and 1.0 wt % respectively.

  • o

    Reduction in thermal resistance, enhancement in HTC and thermal conductivity were 66.1%, 29.4 % and 63.5 % respectively.

 2014
Khalili et al. [66] Filling ratio: 10, 20, 30, 45 Orientation (Deg.): 0, 90, 270
Heat Load (W): 0-150
  • o

    Optimum filling ratio was 20%.

  • o

    Thermal resistance of partly sintered wick heat pipe was lower by 28%, 17% and 47% as compare with annular sintered wick heat pipe for vertical, horizontal and reverse-vertical orientation.

 2016
Sadeghinezhad et al. [67] Types of nanofluids: Graphene/Water
% concentration: 0.025, 0.05, 0.075 wt%		 Orientation (Deg.): 0, 30, 60, 90
Heat Load (W): 20, 40, 60, 80
Surface temperature (°C): 10-40
  • o

    0.1wt% concentration gives best performance.

 2016
Vijaykumar et al. [68] Types of nanofluids: CuO, Al2O3/DI Water
% concentration: 0.5, 1.0, 1.5 %
Particle size (nm): 50		 Orientation (Deg.): 0, 30, 45, 60, 75, 90
Heat Load (W): 10-160
  • o

    Optimum inclination angle was 45°.

  • o

    Optimum concentrations were 1.0 wt% for CuO and 1.5 wt% for Al2O3.

  • o

    HTC was increased by 32.99% and 24.59% for CuO and Al2O3 respectively.

 2016
Vijaykumar et al. [69] Types of nanofluids: CuO, Al2O3/DI Water
% concentration: 0.5, 1.0, 1.5 wt%
Particle size (nm): 20, 50		 Orientation (Deg.): 0-90
Heat Load (W): 30-150
Surface temperature (°C): 0-30
  • o

    Max. thermal efficiency of Heat pipe filled with CuO was 30.42 % at 1.0 wt% concentration and Al2O3 was 26.17 % at 1.5 wt% concentration.

 2017