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HEAT TRANSFER IN NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS

Submerged Jet Impingement Boiling of Water Under Subatmospheric Conditions

[+] Author and Article Information
Ruander Cardenas

School of Mechanical, Industrial, and Manufacturing Engineering,  Oregon State University, Corvallis, OR 97331-6001 vinod.narayanan@oregonstate.edu

Vinod Narayanan1

School of Mechanical, Industrial, and Manufacturing Engineering,  Oregon State University, Corvallis, OR 97331-6001 vinod.narayanan@oregonstate.edu

1

Corresponding author.

J. Heat Transfer 134(2), 020909 (Dec 19, 2011) (8 pages) doi:10.1115/1.4005064 History: Received January 11, 2011; Revised July 15, 2011; Published December 19, 2011; Online December 19, 2011

An experimental study of jet impingement boiling is presented for water under saturated and subcooled conditions. Unique to this study is the documentation of boiling curves of a submerged water jet under subatmospheric conditions. Data are reported at a fixed nondimensional nozzle-to-surface distance of H/dj  = 6 and for a fixed surface-to-nozzle diameter ratio, dsurf /dj , of 23.8. Saturated jet impingement experiments are performed at three subatmospheric pool pressures of 0.176 bar, 0.276 bar, and 0.478 bar with corresponding saturation temperatures of 57.3 °C, 67.2 °C, and 80.2 °C. At each pressure, jet impingement boiling at varying Reynolds numbers are characterized and compared with pool boiling heat transfer. The effect of surface roughness and fluid subcooling is studied at the lowest pressure of 0.176 bar. Boiling curves indicate a strong dependence of heat flux on jet Reynolds number in the partially developed nucleate boiling region but only a weak dependence in the fully developed nucleate boiling region. At a fixed wall superheat, fluid subcooling is found to shift the boiling curve to the left thereby enhancing heat transfer performance. Critical heat flux is found to increase with increases in pressure, surface roughness, and Reynolds number.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Simplified schematic of the experimental facility

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Figure 2

Schematic test section

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Figure 3

Saturated pool boiling curves for a 123 nm Ra surface

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Figure 4

Bubble size comparison at saturated pool boiling conditions for q″ = 10 W/cm2 on a 33 nm Ra surface: (a) P = 0.176 bar, (b) P = 0.276 bar, and (c) P = 0.478 bar

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Figure 5

Jet impingement boiling visualization at P = 0.176 bar on a 33 nm Ra surface for (a–c) saturated fluid and (d) and (f) 17 °C subcooled fluid

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Figure 6

Saturated jet impingement boiling at P = 0.176 bar on a 123 nm Ra surface

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Figure 7

Saturated jet impingement boiling at P = 0.276 bar on a 123 nm Ra surface

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Figure 8

Saturated jet impingement boiling at P = 0.478 bar on a 123 nm Ra surface

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Figure 9

Saturated jet impingement boiling at P = 0.176 bar on a 33 nm Ra surface

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Figure 10

17 °C subcooled jet impingement boiling at P = 0.176 bar on a 33 nm Ra surface

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