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Appl. Sci. 2018, 8(7), 1052; https://doi.org/10.3390/app8071052

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

1
Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institutes, School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road, Guangzhou 510640, China
2
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA
*
Author to whom correspondence should be addressed.
Received: 3 June 2018 / Revised: 19 June 2018 / Accepted: 27 June 2018 / Published: 28 June 2018
(This article belongs to the Special Issue New Heating and Cooling Concepts)
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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 (αa,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. View Full-Text
Keywords: aluminium micro heat pipe; working fluid; optimal inclination angle; liquid film distribution aluminium micro heat pipe; working fluid; optimal inclination angle; liquid film distribution
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Huang, G.; Tang, Y.; Wang, P.; Lu, L.; Yuan, W. Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle. Appl. Sci. 2018, 8, 1052.

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