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Research Papers: Two-Phase Flow and Heat Transfer

Developing the Coaxial Dual-Pipe Heat Pipe for Applications on Heat Pipe Cooler

[+] Author and Article Information
Chen-Ching Ting1

Department of Mechanical Engineering,  National Taipei University of Technology, Taipei, 10608 Taiwanchchting@ntut.edu.tw

Chien-Chih Chen

 Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei, 10608 Taiwant8669030@ntut.edu.tw

1

Corresponding author.

J. Heat Transfer 133(9), 092901 (Aug 01, 2011) (7 pages) doi:10.1115/1.4003904 History: Received October 18, 2010; Revised March 29, 2011; Accepted March 30, 2011; Published August 01, 2011

This article presents significant experimental data about the coaxial dual-pipe heat pipe which is invented by our CCT laboratory. The coaxial dual-pipe heat pipe is built-in an inner pipe in the adiabatic section of a common heat pipe. A common heat pipe is composed of three sections: the evaporator section at the one end; the condenser section at the other end; and the adiabatic section in between. The vapor and the liquid phases of the working fluid flow in opposite directions through the core and the wick, respectively. This special heat transfer behavior causes a common heat pipe to yield the discrete heat transfer property. In process, the vapor directly brings large amounts of heat from heat source and rapidly flows through the adiabatic section to the condenser section. This intelligent heat transfer technique lets the heat pipe yield extremely large thermal conductivity. Unfortunately, a heat pipe integrated with cooling fin in the adiabatic section has changed its original heat transfer property. The integrated cooling fin in the adiabatic section has in advance taken heat of the vapor away and caused the vapor to be condensed in the adiabatic section. Therefore, the vapor cannot reach the condenser section and the condenser section hence loses its cooling capability. In other words, the effective cooling length of a common heat pipe which is integrated with cooling fin in the adiabatic section is shortened. The coaxial dual-pipe heat pipe is built-in an inner pipe in the adiabatic section of a common heat pipe to avoid heat of the vapor to be earlier taken away and even condensed in the adiabatic section. Experimental study in this work first built a home-made square coaxial dual-pipe heat pipe integrated with outside isothermal cycling cooling water as the coaxial dual-pipe heat pipe cooler. The home-made square coaxial dual-pipe heat pipe has an observation window. It is convenient to observe change of the two-phase flow inside the heat pipe influenced by the outside cooling water. The results show that the new developed coaxial dual-pipe heat pipe cooler has kept the original heat transfer property of the bare heat pipe. The vapor has reached the condenser section.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematics of a bare heat pipe

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Figure 2

Schematics of a heat pipe cooler

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Figure 3

Schematics of a dual-pipe heat pipe cooler

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Figure 4

Exploded view of the home-made square heat pipe

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Figure 5

Schema of CPU simulator

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Figure 6

Schema of the experimental setup for temperature measurements

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Figure 7

Integration photos of the home-made square coaxial dual-pipe heat pipe with outside cooling apparatuses. (a) Temperature measured points. (b) Inner pipe position.

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Figure 8

Photos of the home-made square coaxial dual-pipe heat pipe including the temperature measured points and the inner pipe position. (a) Temperature measured points. (b) Inner pipe position.

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Figure 9

Time dependent surface temperature distribution on the home-made square coaxial dual-pipe heat pipe without outside cooling

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Figure 10

Developing surface temperature distribution on the home-made square coaxial dual-pipe heat pipe without outside cooling heated in 700 s

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Figure 11

Developing surface temperature distribution on the commercial heat pipe without outside cooling heated in 117 s (Ref. 17)

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Figure 12

Time dependent surface temperature distribution on the home-made square coaxial dual-pipe heat pipe with cycling isothermal cooling water

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Figure 13

Surface temperature distribution on the home-made square coaxial dual-pipe heat pipe with cycling isothermal cooling water heated in 600 s

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Figure 14

Time sequent heat flux visualization of the home-made single-pipe heat pipe using the infrared thermal photography integrated with isothermal cooling water. (a) At the beginning. (b) Heated in 100 s. (c) Heated in 200 s. (d) Heated in 300 s. (e) Heated in 400 s. (f) Heated in 500 s.

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Figure 15

Time sequent heat flux visualization of the home-made coaxial dual-pipe heat pipe using the infrared thermal photography with cycling isothermal cooling water

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Figure 16

Time dependent surface temperature distribution on the home-made square coaxial dual-pipe heat pipe with aluminum cooling plates

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Figure 17

Surface temperature distribution on the home-made square coaxial dual-pipe heat pipe with aluminum cooling plates heated in 600 s

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