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Research Papers: Evaporation, Boiling, and Condensation

A Possible Role of Nanostructured Ridges on Boiling Heat Transfer Enhancement

[+] Author and Article Information
Shalabh C. Maroo

Department of Mechanical and Aerospace
Engineering,
Syracuse University,
Syracuse, NY 13244
e-mail: scmaroo@syr.edu

J. N. Chung

Department of Mechanical and Aerospace
Engineering,
University of Florida,
Gainesville, FL 32611
e-mail: jnchung@ufl.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received May 28, 2012; final manuscript received November 22, 2012; published online March 20, 2013. Assoc. Editor: Louis C. Chow.

J. Heat Transfer 135(4), 041501 (Mar 20, 2013) (7 pages) Paper No: HT-12-1249; doi: 10.1115/1.4023229 History: Received May 28, 2012; Revised November 22, 2012

Evaporation of a nanoscale meniscus on a nanostructured heater surface is simulated using molecular dynamics. The nanostructures, evenly spaced on the surface, are ridges with a width and height of 0.55 nm and 0.96 nm, respectively. The simulation results show that the film breaks during the early stages of evaporation due to the presence of nanostructures and no nonevaporating film forms (unlike a previous simulation performed in the absence of nanostructures where nonevaporating film forms on the smooth surface). High heat transfer and evaporation rates are obtained. We conclude that heat transfer rates can be significantly increased during bubble nucleation and growth by the presence of nanostructure ridges on the surface as it can break the formation of nonevaporating film. This causes additional chaos and allows the surrounding cooler liquid to come in contact with the surface providing heat transfer enhancements.

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Figures

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Fig. 1

Schematic of bubble growth (a) overall picture at macroscale, and (b) zoomed in nano- and microscale regions at the three-phase contact line

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Fig. 2

Schematic showing configuration of the computational domain

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Fig. 3

The lattice arrangement of the platinum atoms on the x–z plane for a typical nanostructure

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Fig. 4

Schematic depicting the division of nanochannels and liquid meniscus into 12 regions

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Fig. 5

Snapshots of x–z plane at different time steps

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Fig. 6

Snapshots of x–z plane at different time instants for nanoscale meniscus evaporation with no nanostructures on the surface [12]

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Fig. 7

Variation of liquid atoms with time for regions 1–6

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Fig. 8

Variation of vapor pressure with time

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Fig. 9

Average temperatures of regions having a minimum of 50 liquid atoms

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Fig. 10

Average heat flux in regions 2–9 over different time periods. For comparison purposes, the averaged heat flux with no nanostructures is included. The dotted lines only serve as a guide to the eye.

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Fig. 11

Average evaporation rates in regions 3–8 over different time periods. For comparison purposes, the averaged evaporation rate with no nanostructures is included. The dotted lines only serve as a guide to the eye.

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