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Technical Briefs

Ultrasonic Effect on the Startup of an Oscillating Heat Pipe

[+] Author and Article Information
Dianli Zhao

Institute of Marine Engineering and Thermal Science,
College of Marine Engineering,
Dalian Maritime University,
Dalian, 116026, China

H. B. Ma

LaPierre Professor
Fellow ASME
Department of Mechanical and Aerospace Engineering,
University of Missouri,
Columbia, MO 65211
e-mail: mah@missouri.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 4, 2012; final manuscript received February 21, 2013; published online June 6, 2013. Assoc. Editor: James A. Liburdy.

J. Heat Transfer 135(7), 074503 (Jun 06, 2013) (3 pages) Paper No: HT-12-1417; doi: 10.1115/1.4023884 History: Received August 04, 2012; Revised February 21, 2013

This paper investigates the ultrasonic sound effect on oscillating motion and heat transfer in an oscillating heat pipe (OHP). The ultrasonic sound produced by electrically controlled piezoelectric ceramics is used to generate and maintain the oscillating motion and thereby enhance heat transfer. The results demonstrate that when an ultrasonic sound with a total electric power of 4.48 mW is added, the input power needed to start the oscillating motion can be reduced from 30 W to 18 W and the effective thermal conductivity is increased from 672.8 W/mK to 1254.7 W/mK.

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Figures

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Fig. 1

Schematic of the oscillating heat pipe with locations of the PZTs and thermocouples (dimension unit: mm)

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Fig. 2

Schematic of the control unit generating ultrasonic sound

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Fig. 3

Schematic of the experimental system

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Fig. 4

Ultrasonic effect on the oscillating temperature at a heat input power of 29 W (thermocouple No. 27 on the evaporating section)

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Fig. 5

Ultrasonic effect on the oscillating temperature at a heat input power of 18 W (thermocouple No. 27 on the evaporating section)

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Fig. 6

Ultrasonic effect on the oscillating temperatures at a heat input power of 18 W (Point A indicates when the ultrasonic sound was applied)

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Fig. 7

Ultrasonic effect on the oscillating temperatures (Point A: turn on the ultrasonic sound and Point B: turn off the ultrasonic sound)

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