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TECHNICAL BRIEFS

Thermal Analysis of Inclined Micro Heat Pipes

[+] Author and Article Information
D. Sugumar

Faculty of Manufacturing Engineering, National Technical University College of Malaysia, Locked Bag 1200, Ayer Keroh, 75450 Malaysiasugumar@kutkm.edu.my

Kek-Kiong Tio

Faculty of Engineering & Technology, Multimedia University, Bukit Beruang, 75450 Malacca, Malaysiakktio@mmu.edu.my

J. Heat Transfer 128(2), 198-202 (Aug 09, 2005) (5 pages) doi:10.1115/1.2137763 History: Received July 28, 2004; Revised August 09, 2005

The effect of gravity is investigated for the case of inclined-triangular- and trapezoidal-shaped micro heat pipes (MHPs). The study is limited to the case of positive inclination, whereby the condenser section is elevated from the horizontal position. The results show that the axial distribution of the liquid phase is changed qualitatively. While the liquid distribution still increases monotonically starting from the evaporator end, it reaches its maximum value not at the condenser end but at a certain point in the condenser section, beyond which the liquid distribution decreases monotonically. This maximum point, where potentially flooding will first take place, results from the balance between the effects of gravity and the heat load on the MHPs. As the liquid distribution assumes its greatest value at the maximum point, a throat-like formation appears there. This formation is detrimental to the performance of MHPs, because it hinders, and at worst may block, the axial flow of the vapor phase. The results also show that the maximum point occurs further away from the condenser end for a triangular-shaped MHP compared to a trapezoidal-shaped MHP.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic diagram of an inclined micro heat pipe, θ being the angle of inclination

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Figure 2

Geometry of different cross-sectional shapes of micro heat pipes. (a) Equilateral triangle and (b) cusped diamond.

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Figure 3

Profiles of liquid volume fraction for different angles of inclination for an equilateral-triangle-shaped micro heat pipe (Ca=0.0274; M̂=0.187; working fluid=water; operating temperature=60°C)

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Figure 4

Profiles of liquid volume fraction for different angles of inclination for a cusped-diamond-shaped micro heat pipe (Ca=0.1204; M̂=0.172; working fluid=water; operating temperature=60°C)

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Figure 5

Maximum allowable heat transport rate of different types of micro heat pipe designed for a horizontal orientation as a function of the angle of inclination (working fluid=water; operating temperature=60°C)

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Figure 6

Location in the axial direction of the onset of flooding for different cross-sectional-shaped micro heat pipes as a function of its angle of inclination (working fluid=water; operating temperature=60°C)

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Figure 7

Heat transport capacity for different types of cross-sectional-shaped micro heat pipe as a function of the angle of inclination (working fluid=water; operating temperature=60°C)

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Figure 8

Optimal charge level for different types of cross-sectional-shaped micro heat pipe as a function of the angle of inclination (working fluid=water; operating temperature=60°C)

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