Molecular simulations of droplet evaporation by heat transfer |
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Authors: | Siswo Sumardiono Johann Fischer |
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Affiliation: | 1. Institut für Verfahrens- und Energietechnik, Universit?t für Bodenkultur, Muthgasse 107, 1190, Wien, Austria
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Abstract: | Droplet evaporation by heat transfer is investigated by molecular dynamics simulations for a pure Lennard-Jones fluid. Two
different initial conditions are treated: (1) a droplet surrounded by its vapor in equilibrium, (2) a cold droplet surrounded
by warm vapor. In both cases heat is transferred from a heat bath. Results are the numbers of droplet molecules N
d and density, drift velocity, and temperature profiles as functions of time. For the small droplets considered N
d depends on the definition of a droplet molecule. The density profiles as function of time show a transition from a droplet
with liquid–vapor interface to a cluster of interfacial type and finally to the gas state. The temperature at a given time
is nearly constant within the droplets or clusters but strong gradients occur in the gas. In case of evaporation of a cold
droplet surrounded by warm vapor we observed initially cooling down of the droplet corresponding to pressure jump evaporation
and thereafter slower evaporation because of lower initial state vapor density. |
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Keywords: | Droplet Evaporation Molecular dynamics Density profiles Temperature profiles |
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