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Numerical Simulation of Jumping-Droplet Condensation.

08:00 EDT 12th July 2019 | BioPortfolio

Summary of "Numerical Simulation of Jumping-Droplet Condensation."

Jumping-droplet condensation has been shown to enhance the heat transfer performance (≈100%) when compared to dropwise condensation by reducing the time-averaged droplet size (≈ 10 μm) on the condensing surface. Here, we develop a rigorous, three dimensional numerical simulation of jumping-droplet condensation in order to compute the steady-state time-averaged droplet size distribution. In order to characterize the criteria for achieving steady-state, we use maximum radii (R_max) tracking on the surface, showing that R_max settles to an average in time once steady-state is reached. The effects of the minimum jumping radius (0.1µm - 10 µm), maximum jumping radius, apparent advancing contact angle (150° - 175°), and droplet growth rate were investigated. We provide a numerical fit for the jumping droplet condensation size distribution with an overall correlation coefficient greater than 0.995. The heat transfer performance was evaluated as a function of contact angle and hydrophobic coating thickness, showing excellent agreement with prior experimentally measured values. Our simulations uncovered that droplet size mismatch during coalescence has the potential to impede the achievement of steady state, and describe a new flooding mechanism for jumping droplet condensation. Our work not only develops a unified numerical model for jumping droplet condensation that is extendable to a plethora of other conditions, it demonstrates design criteria for non-wetting surface manufacture for enhanced jumping-droplet condensation heat transfer.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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