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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

## Abstract

The heat transfer performance of two microjet arrays was investigated using degassed deionized water and air. The inline jet arrays had diameters of $54 μm$ and $112 μm$, a spacing of $250 μm$, a standoff of $200 μm$ ($S/d=2.2$ 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 $150≤Red≤3300$ and ranged from $80,000 W/m2 K$ to $414,000 W/m2 K$. A heat flux of $1110 W/cm2$ 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 $300≤Red≤4900$ with average heat transfer coefficients of $2500 W/m2 K$ to $15,000 W/m2 K$. 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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## Figures

Figure 1

Schematic of the flow loop

Figure 2

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

Figure 3

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

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.

Figure 5

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

Figure 6

Dimensional heat transfer performance of both jet arrays with water

Figure 7

Heat transfer performance of both jet arrays with water

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

Figure 9

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

Figure 10

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

Figure 11

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

Figure 12

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

Figure 13

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

Figure 14

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

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