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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

MODELING OF JUMPING-DROPLET CONDENSATION WITH DYNAMIC DROPLET GROWTH

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.023384
pages 5073-5080

Résumé

Jumping-droplet condensation has demonstrated promising heat transfer performance compared to dropwise condensation due to the high-efficient coalescence-induced shedding. Accurate modeling of the jumping-droplet condensation is crucial to provide in-depth understanding of the phenomenon. However, most models relied on extensions of traditional dropwise condensation models, which ignore the influences of convection and dynamic growth of the droplets. In this paper, we present an improved model for jumping-droplet condensation capturing the dynamics of the droplet growth. First, for the heat transfer prediction of a single droplet, we investigated the time-dependent heat transfer in two-phase flow during dynamic growth. Both heat flux and mass flow through the liquid-vapor interface were considered. Driven by the incoming mass flow, the continuous growth of droplets from the incipient nucleation size to hundreds of microns was realized, and heat transfer through the dynamic evolution of single droplet growth was analyzed. We then incorporated the single droplet growth dynamics with the size distribution theory, where a new boundary condition for population balance theory was developed. Finally, the heat transfer coefficients for jumping-droplet condensation was calculated by combining the dynamic droplet growth model and improved size distribution theory. This work provides an improved model framework and physical insights of jumping droplet condensation.