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HEAT TRANSFER IN NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS

Flow Boiling of Water on Nanocoated Surfaces in a Microchannel

[+] Author and Article Information
Hai Trieu Phan1

 Joseph Fourier University, LEGI, BP 53, 38041 Grenoble Cedex 9, France;  LITEN, CEA Grenoble, 17 rue des martyrs, 38054 Grenoble Cedex 9, France e-mail: haitrieu.phan@laplace.univ-tlse.fr Joseph Fourier University, LEGI, BP 53, 38041 Grenoble Cedex 9, France LITEN, CEA Grenoble, 17 rue des martyrs, 38054 Grenoble Cedex 9, France

Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet

 Joseph Fourier University, LEGI, BP 53, 38041 Grenoble Cedex 9, France;  LITEN, CEA Grenoble, 17 rue des martyrs, 38054 Grenoble Cedex 9, France e-mail: haitrieu.phan@laplace.univ-tlse.fr Joseph Fourier University, LEGI, BP 53, 38041 Grenoble Cedex 9, France LITEN, CEA Grenoble, 17 rue des martyrs, 38054 Grenoble Cedex 9, France

1

Corresponding author.

J. Heat Transfer 134(2), 020901 (Dec 13, 2011) (6 pages) doi:10.1115/1.4004935 History: Received December 27, 2010; Revised August 10, 2011; Published December 13, 2011; Online December 13, 2011

The experiments were performed to study the effects of surface wettability on flow boiling of water at atmospheric pressure. The test channel is a single rectangular channel 0.5 mm high, 5 mm wide and 180 mm long. The mass flux was set at 100 kg/m2 s and the base heat flux varied from 30 to 80 kW/m2 . Water enters the test channel under subcooled conditions. The samples are silicon oxide (SiOx), titanium (Ti), diamond-like carbon (DLC), and carbon-doped silicon oxide (SiOC) surfaces with static contact angles of 26 deg, 49 deg, 63 deg, and 104 deg, respectively. The results show significant impacts of surface wettability on heat transfer coefficient.

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Figures

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Figure 1

Static contact angles of 2-μl sessile water-droplets on stainless steel surfaces with and without nanoparticle deposition at 25 °C [7]

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Figure 2

Top view of fabrication procedure of sample surfaces

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Figure 3

Schematic view of electrical connections

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Figure 4

Assembly of the test section

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Figure 5

Schematic view of the experimental apparatus

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Figure 6

Pressure loss versus Reynolds number

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Figure 7

Local Nusselt number versus reduced length

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Figure 8

Static contact angles of a water-droplet on the sample surfaces at room temperature

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Figure 10

Flow patterns on titanium surface with (i) original image and (ii) image with contour sharpening

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Figure 11

Boiling curves for different surfaces having different contact angles

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Figure 9

Heat transfer coefficient versus vapor quality on (a) SiOx surface; (b) Ti surface; (c) DLC surface; and (d) SiOC surface

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