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Research Papers: Electronic Cooling

An Investigation of a Tunable Magnetomechanical Thermal Switch

[+] Author and Article Information
Katherine E. Bulgrin, Y. Sungtaek Ju, Greg P. Carman

 University of California, Los Angeles, Mechanical and Aerospace Engineering Department, Los Angeles, CA 90095lavine@seas.ucla.edu

Adrienne S. Lavine1

 University of California, Los Angeles, Mechanical and Aerospace Engineering Department, Los Angeles, CA 90095lavine@seas.ucla.edu

1

Corresponding author.

J. Heat Transfer 133(10), 101401 (Aug 11, 2011) (7 pages) doi:10.1115/1.4004166 History: Received March 18, 2010; Revised April 22, 2011; Published August 11, 2011; Online August 11, 2011

We propose a new device-level concept for a thermal switch that exploits the temperature dependence of the magnetization of a ferromagnetic material oscillating between a hot and a cold surface. A numerical model is constructed to examine the operation of the thermal switch. The switch turn-on temperature can be readily tuned by adjusting physical parameters of the device, such as the gap between the hot and cold surfaces and the spring constant of the structure supporting the ferromagnet. Experimentally determined oscillation frequencies are consistent with the model predictions. Additionally, it is shown that the thermal contact conductance has a large influence on the device performance. The time-averaged heat flux and effective conductance compare favorably to existing thermal switch technologies over a range of hot surface temperatures.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Side view of the thermal switch

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Figure 2

The experimental and analytical fit for magnetic force versus magnet spacing for different gadolinium temperatures

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Figure 3

(a) Position versus time and (b) temperature versus time modeling outputs for the base case values of the thermal switch and Ths  = 50 °C

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Figure 4

Hot and cold actuation temperatures of the gadolinium versus (a) the spacing of the hot and cold surfaces and (b) the spring constant

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Figure 5

Frequency versus hot surface temperature (a) for different total gap spacings and (b) for different spring constants

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Figure 6

Time-averaged heat flux versus temperature of the hot surface for various (a) hot/cold surface spacings and (b) spring constants

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Figure 7

Effective conductance of thermal switch versus hot surface temperature for varying (a) total gap distances and (b) spring constants

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Figure 8

Maximum effective conductance versus contact conductance of the surfaces

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Figure 9

The 200 N/m frame

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Figure 10

Hot actuation temperature versus gap distance for different spring constants

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Figure 11

Nondimensional hot side residence time versus temperature parameter for various spring constants

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