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RESEARCH PAPERS

Operating Characteristic Investigations in Pulsating Heat Pipe

[+] Author and Article Information
Qingjun Cai

 Rockwell Scientific Company, 1049 Camino Dos Rios, Thousand Oaks, CA 91360qcai@rwsc.com

Chung-lung Chen

 Rockwell Scientific Company, 1049 Camino Dos Rios, Thousand Oaks, CA 91360

Julie F. Asfia

 The Boeing Company, 5301 Bolsa Ave, MC H013-B308, Huntington Beach, CA 92647Julie.asfia@boeing.com

J. Heat Transfer 128(12), 1329-1334 (Feb 06, 2006) (6 pages) doi:10.1115/1.2349509 History: Received September 09, 2005; Revised February 06, 2006

Pulsating heat pipe (PHP) is an interesting heat transfer device. In this paper we focus on PHP heat transfer characteristics versus its operating temperature. In experiments of copper and stainless steel PHPs, results indicate that, at a same input power, both the total temperature differences (from the evaporator to condenser) and the evaporator temperature fluctuations are relevant to operating temperature. The minimal total temperature difference and temperature fluctuation appear at an operating temperature ranging from 120°Cto160°C. Experimental analysis of the evaporator temperature fluctuations show that single phase cooling in PHP causes a large total temperature difference and temperature fluctuation. Phase change proportion increases at the optimal operating temperature. Static mechanical balance combining with dynamic elastic oscillation system is used to interpret PHP temperature variations versus the operating temperature.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Testing stainless steel PHP

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Figure 2

Schematics of test system

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Figure 3

Test results of the copper PHP, 40%, water

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Figure 4

Test results of the copper PHP, 55%, water

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Figure 5

Test results of the copper PHP, 70%, water

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Figure 6

Test results of stainless steel PHP-A, 70%, water

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Figure 7

Test results of stainless steel PHP-B, 70%, water

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Figure 8

Dryout phenomenon in PHP-B, 70%, and 300W

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Figure 9

Temperature difference at different sections, Copper PHP, 40%, 200W

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Figure 10

Temperature difference at different sections, PHP-B, 70%, 200W

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Figure 11

Temperature fluctuation, copper PHP, 40 & 70%, 100W

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Figure 12

Temperature fluctuation, PHP-A, 70%, 100 and 400W

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Figure 13

PHP startup and oscillation mechanisms

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Figure 14

Model of oscillation movement of PHP

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