Droplet Evaporation in a Gas-Droplet Mist Dilute Turbulent Flow behind a Backward-Facing Step

The mean and fluctuation flow patterns and heat transfer in a turbulent droplet-laden dilute flow behind a two-dimensional single-side backward-facing step are numerically studied. Numerical simulations are performed for water droplets, with the inlet droplet diameters d1 = 1–100 μm; they have a mas...

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Bibliographic Details
Published in:Water (Basel) 2021-09, Vol.13 (17), p.2333
Main Authors: Pakhomov, Maksim A., Terekhov, Viktor I.
Format: Article
Language:English
Subjects:
Backward facing steps
Computational fluid dynamics
Dilution
Droplets
Evaporation
Flow distribution
Gas flow
Heat transfer
Investigations
Mist
Reynolds number
Turbulence models
Turbulent flow
Two dimensional flow
Velocity
Water drops
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Summary:The mean and fluctuation flow patterns and heat transfer in a turbulent droplet-laden dilute flow behind a two-dimensional single-side backward-facing step are numerically studied. Numerical simulations are performed for water droplets, with the inlet droplet diameters d1 = 1–100 μm; they have a mass fraction of ML1 = 0–0.1. There is almost no influence of a small number of droplets on the mean gas flow and coefficient of wall friction. A substantial heat transfer augmentation in a droplet-laden mist-separated flow is shown. Heat transfer increases both in the recirculating flow and flow relaxation zones for fine, dispersed droplets, and the largest droplets augment heat transfer after the reattachment point. The largest heat transfer enhancement in a droplet-laden flow is obtained for small particles.
ISSN:2073-4441
2073-4441
DOI:10.3390/w13172333