Thermal performance of inclined grooved heat pipes using nanofluids

Liu, Zhenhua; Li, Yuan-Yang; Bao, Ran

doi:10.1016/j.ijthermalsci.2010.03.006

Cited by 126 publications

(37 citation statements)

References 11 publications

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“…The maximum heat transfer capacity of a heat pipe charged with nanofluid was also enhanced by up to 40 % compared with a heat pipe charged with water. Liu et al [3] studied the effect of inclination angle on the performance of a GHP with a CuO nanofluid as the working fluid. They found that the performance of the inclined GHP can be strengthened with the use of a CuO nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of a grooved heat pipe with an anodised surface

Solomon

Kumar²,

Ramachandran

et al. 2016

Heat Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Characterisation of a grooved heat pipe with an anodised surface

Solomon

Kumar²,

Ramachandran

et al. 2016

Heat Mass Transfer

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“…For example, in the study of Shin et al [24], the optimal volumetric fractions are as small as 13.6-17.7% with a large wick volume of 336 mL/m 2 . However, in the study of Liu et al [23], the optimal volumetric fractions in this case were larger, ranging from 51.4% to 65.2% with a small volume of wick of 111 mL/m 2 . It is reasonable for a deep groove to have a smaller volumetric fraction.…”

Section: Liquid Film Profile Of the Mf-ahpasmentioning

confidence: 65%

“…However, the thermal resistance curves of the cyclopentane MF-AHPA and n-hexane MF-AHPA are U-shaped, and different from the acetone one, meaning an occurrence of partial dry out after reaching minimum thermal resistances (MTRs). At high heat flux, the cyclopentane MF-AHPA and n-hexane MF-AHPA significantly suffered from local dry-out, resulting in a decreased heat transfer coefficient in the evaporation section [23]. Local dry-out could reduce an evaporation heat transfer coefficient by more than 25%.…”

Section: Effect Of Working Fluids On Heat Pipe Thermal Resistancementioning

confidence: 99%

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Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

et al. 2018

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Featured Application: solar collector; solar thermal system; thermal energy storage system; heat exchanger.Abstract: A micro heat pipe array is desirable owing to its high heat transfer capacity, compact size, and high surface-volume ratio compared with conventional heat pipes. In this study, micro flat aluminium heat pipe arrays (MF-AHPA) were developed and systematically characterised by varying working fluid and inclination angle. Three MF-AHPAs with different working fluids, i.e., acetone, cyclopentane, and n-hexane, were fabricated. The acetone MF-AHPA achieved the best thermal performance. The underlying mechanism is the small flow viscous friction and small shearing force of liquid vapour. Additionally, the experimental results show a strong dependence of MF-AHPAs' thermal resistance on the orientation due to the gravitational effect on axial liquid distribution. Finally, a criterion is proposed to determine the optimal inclination angle of the MF-AHPA. In the present study, a volumetric fraction (α a,c ) of 74 ± 7% has been shown to well predict an optimal inclination angle of the MF-AHPAs with various working fluids and heat loads.

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“…The important finding from these results is that the increment in viscosity of the NF compared with the base fluid is more than two times higher than the thermal conductivity increment of the NF. [16] Screenmesh Water based alomina (30 nm &2.4 wt.%) + Kang et al [17] Sintered Water based silver (10 nm & 0.01 wt.%) + Liu et al [18] Grooved Water based copper oxide (50 nm & 1.0 wt.%) + Kang et al [19] Grooved Water based silver Ag-water (35 nm, 0.01 wt.%) + Ji et al [20] Oscillating …”

Section: Working Fluidmentioning

confidence: 99%

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Ghanbarpour

Nikkam

Khodabandeh

et al. 2015

Experimental Thermal and Fluid Science

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a b s t r a c tThis study presents the effect of Al 2 O 3 nanofluid (NF) on thermal performance of screen mesh heat pipe in cooling applications. Three cylindrical copper heat pipes of 200 mm length and 6.35 mm outer diameter containing two layers of screen mesh were fabricated and tested with distilled water and water based Al 2 O 3 NF with mass concentrations of 5% and 10% as working fluids. To study the effect of NF on the heat pipes thermal performance, the heat input is increased and then decreased consecutively and the heat pipes surface temperatures are measured at steady state conditions. Results show that using 5 wt.% of Al 2 O 3 NF improves the thermal performance of the heat pipe for increasing and decreasing heat fluxes compared with distilled water, while utilizing 10 wt.% of Al 2 O 3 NF deteriorates the heat pipe thermal performance. For heat pipe with 5 wt.% Al 2 O 3 NF the reduction in thermal resistance of the heat pipe is found to be between 6% and 24% for increasing and between 20% and 55% for decreasing heat fluxes, while the thermal resistance increased between 187% and 206% for increasing and between 155% and 175% for decreasing steps in heat pipe with 10 wt.% of Al 2 O 3 NF.

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Thermal performance of inclined grooved heat pipes using nanofluids

Cited by 126 publications

References 11 publications

Characterisation of a grooved heat pipe with an anodised surface

Characterisation of a grooved heat pipe with an anodised surface

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

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