Heterogeneous bubble nucleation was studied on surfaces having nanometer scale asperities and indentations as well as different surface-fluid interaction energies. Nonequilibrium molecular dynamics simulations at constant normal stress and either temperature or heat flux were carried out for the Lennard–Jones fluid in contact with a Lennard–Jones solid. When surface defects were of the same size or smaller than the estimated critical nucleus (the smallest nucleus whose growth is energetically favored) size of , there was no difference between the defected surfaces and atomically smooth surfaces. On the other hand, surfaces with significantly larger indentations had nucleation rates that were about two orders of magnitude higher than the systems with small defects. Moreover, nucleation was localized in the large indentations. This localization was greatest under constant heat flux conditions and when the solid-fluid interactions were weak. The results suggest strategies for enhancing heterogeneous bubble nucleation rates as well as for controlling the location of nucleation events.
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An Atomistic Simulation Study of the Role of Asperities and Indentations on Heterogeneous Bubble Nucleation
Brian R. Novak,
Brian R. Novak
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556
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Edward J. Maginn,
Edward J. Maginn
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556
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Mark J. McCready
Mark J. McCready
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556
Search for other works by this author on:
Brian R. Novak
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556
Edward J. Maginn
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556
Mark J. McCready
Department of Chemical and Biomolecular Engineering,
University of Notre Dame
, Notre Dame, IN 46556J. Heat Transfer. Apr 2008, 130(4): 042411 (9 pages)
Published Online: March 21, 2008
Article history
Received:
February 22, 2007
Revised:
July 16, 2007
Published:
March 21, 2008
Citation
Novak, B. R., Maginn, E. J., and McCready, M. J. (March 21, 2008). "An Atomistic Simulation Study of the Role of Asperities and Indentations on Heterogeneous Bubble Nucleation." ASME. J. Heat Transfer. April 2008; 130(4): 042411. https://doi.org/10.1115/1.2818771
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