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Research Papers

Experimental Investigation of Single-Phase Microjet Array Heat Transfer

[+] Author and Article Information
Eric A. Browne, Gregory J. Michna, Michael K. Jensen, Yoav Peles

Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Heat Transfer 132(4), 041013 (Feb 23, 2010) (9 pages) doi:10.1115/1.4000888 History: Received April 20, 2009; Revised September 18, 2009; Published February 23, 2010; Online February 23, 2010

The heat transfer performance of two microjet arrays was investigated using degassed deionized water and air. The inline jet arrays had diameters of 54μm and 112μm, a spacing of 250μm, a standoff of 200μm (S/d=2.2 and 4.6, H/d=1.8 and 3.7), and jet-to-heater area ratios from 0.036 to 0.16. Average heat transfer coefficients with deionized water were obtained for 150Red3300 and ranged from 80,000W/m2K to 414,000W/m2K. A heat flux of 1110W/cm2 was attained with 23°C inlet water and an average surface temperature of 50°C. The Reynolds number range for the same arrays with air was 300Red4900 with average heat transfer coefficients of 2500W/m2K to 15,000W/m2K. The effect of the Mach number on the area-averaged Nusselt number was found to be negligible. The data were compared with available correlations for submerged jet array heat transfer.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the flow loop

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Figure 2

Schematic of the assembly of the fixture, microdevice, and cover plate

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Figure 3

Schematic of the microdevice. The heater is adhered to the bottom surface of the Pyrex wafer (not shown).

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Figure 4

SEM image of the 112 μm jet diameter array microdevice prior to bonding with the Pyrex wafer. The pictured heater area is 1 mm × 1 mm.

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Figure 5

Heat loss ratio as a function of the average heat transfer coefficient

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Figure 6

Dimensional heat transfer performance of both jet arrays with water

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Figure 7

Heat transfer performance of both jet arrays with water

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Figure 8

Dimensional heat transfer performance of both jet arrays with air and the 54 μm jet array with a chamber pressure of 2 bar

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Figure 9

Heat transfer performance of both jet arrays with air and the 54 μm jet array with a chamber pressure of 2 bar

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Figure 10

Air and water data for 54 μm array with curve fit (Eq. 7)

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Figure 11

Air and water data for the 112 μm array with curve fit (Eq. 8)

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Figure 12

Comparison of prediction by Martin (1) to the experimental data

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Figure 13

Comparison of prediction by Womac (12) to the experimental data

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Figure 14

Comparison of prediction by Meola (8) with the experimental data

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