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MICRO/NANOSCALE HEAT TRANSFER—PART II

Experimental Investigation of Miniature Three-Dimensional Flat-Plate Oscillating Heat Pipe

[+] Author and Article Information
S. M. Thompson, R. A. Winholtz, C. Wilson

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211

H. B. Ma

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211mah@missouri.edu

J. Heat Transfer 131(4), 043210 (Feb 24, 2009) (9 pages) doi:10.1115/1.3072953 History: Received November 15, 2008; Revised December 17, 2008; Published February 24, 2009

An experimental investigation on the effects of condenser temperatures, heating modes, and heat inputs on a miniature three-dimensional (3D) flat-plate oscillating heat pipe (FP-OHP) was conducted visually and thermally. The 3D FP-OHP was charged with acetone at a filling ratio of 0.80, had dimensions of 101.60×63.50×2.54mm3, possessed 30 total turns, and had square channels on both sides of the device with a hydraulic diameter of 0.762 mm. Unlike traditional flat-plate designs, this new three-dimensional compact design allows for multiple heating arrangements and higher heat fluxes. Transient and steady-state temperature measurements were collected at various heat inputs, and the activation/start-up of the OHP was clearly observed for both bottom and side heating modes during reception of its excitation power for this miniature 3D FP-OHP. The neutron imaging technology was simultaneously employed to observe the internal working fluid flow for all tests directly through the copper wall. The activation was accompanied with a pronounced temperature field relaxation and the onset of chaotic thermal oscillations occurring with the same general oscillatory pattern at locations all around the 3D FP-OHP. Qualitative and quantitative analysis of these thermal oscillations, along with the presentation of the average temperature difference and thermal resistance, for all experimental conditions are provided. The novelty of the three-dimensional OHP design is its ability to still produce the oscillating motions of liquid plugs and vapor bubbles and, more importantly, its ability to remove higher heat fluxes.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

A three-dimensional oscillating heat pipe (a) photo, (b) dimensions of base plate, and (c) close-up of cross-sectional geometry

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Figure 2

Schematic of experimental setup

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Figure 3

(a) Bottom and side heating modes for 3D FP-OHP oriented with the gravity direction along with (b) thermocouple locations (a1,a2,…,a14 indicate the thermocouple number and location)

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Figure 4

Average temperature difference versus heat input for all three experiments

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Figure 5

Thermal resistance versus heat input for all three experiments.

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Figure 6

3D FP-OHP transient temperature response for Experiment No. 2 at 79.3 W

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Figure 7

3D FP-OHP transient temperature response for Experiment No. 1 at 35.1 W

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Figure 8

3D FP-OHP transient temperature response for Experiment No. 3 at 29.9 W

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Figure 9

3D FP-OHP steady-state temperature distribution versus time for Experiment No. 1 at 78.4 W

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Figure 10

3D FP-OHP steady-state temperature distribution versus time for Experiment No. 2 at 79.4 W

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Figure 11

3D FP-OHP steady-state temperature distribution versus time for Experiment No. 3 at 79.7 W

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Figure 12

Average-maximum peak-to-peak amplitude of thermal oscillations at various heat inputs for all experiments

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Figure 13

Average-maximum peak-to-peak amplitude of thermal oscillations at various heat inputs for all three experiments

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