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Research Papers: Evaporation, Boiling, and Condensation

Thermal Behavior Analysis of Wire Mini Heat Pipe

[+] Author and Article Information
Kleber Vieira de Paiva1

Heat Pipe Laboratory, Department of Mechanical Engineering,  Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazilkpaiva@labtucal.ufsc.br

Marcia Barbosa Henriques Mantelli, Leonardo Kessler Slongo

Heat Pipe Laboratory, Department of Mechanical Engineering,  Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazilkpaiva@labtucal.ufsc.br

1

Corresponding author.

J. Heat Transfer 133(12), 121502 (Oct 06, 2011) (9 pages) doi:10.1115/1.4004526 History: Received April 12, 2010; Revised June 17, 2011; Accepted June 29, 2011; Published October 06, 2011; Online October 06, 2011

This work presents a theoretical and experimental analysis of a copper mini heat pipe (MHP), fabricated from a sandwich formed between cylindrical wires and flat plates, which are welded by means of diffusion process. The edges formed between the wires and the plates provide the working fluid capillary pressure necessary to overcome all the pressure losses. Two different experimental set ups were developed: one for test in gravity (laboratory) and other for microgravity conditions (International Space Station—ISS). The main difference between them lies in the condenser section. In the laboratory, cooling water was used to remove heat from the mini heat pipe, while at the ISS, fins and air fan were employed. In gravity, three different working fluids were tested: water, acetone, and methanol, while, for the experiments at the ISS, just water was used. A model was developed to predict the maximum heat transfer capacity of the device. In comparison to the literature models, the main difference of the present model is the variation of contact angle to adjust the mathematical model. Therefore, the main contributions of the present work are development of wire plate mini heat pipe fabrication methodology using diffusion welding, improvement of the analytical model used to predict the maximum heat transfer capacity of the device, determination of the present technology optimum design parameters, and test data obtained under microgravity conditions.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 15

Comparison between numerical and experimental result

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Figure 1

Wire mini heat pipe parts and microscopic picture of the cross section view

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Figure 2

(a) Laboratory setup and (b) experimental setup sketch

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Figure 3

HPS and DAS sketches

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Figure 4

Liquid meniscus geometry

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Figure 5

Contact angle effect on the capillary limit

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Figure 6

At maximum power, liquid and vapor pressure drop for one channel for three different operational conditions for water

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Figure 8

Liquid velocity profile

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Figure 9

Vapor velocity profile

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Figure 10

Distance between wires for one single channel

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Figure 11

Distance between wires for a mini heat pipe

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Figure 12

Comparison among charging volumes of water on the MHP performance

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Figure 13

Comparison among charging volumes of acetone on the MHP performance

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Figure 14

Comparison among charging volumes of methanol on the MHP performance

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