Collisions of Two-Phase Liquid Droplets in a Heated Gas Medium

The paper presents the experimental research findings for the integral characteristics of processes developing when two-phase liquid droplets collide in a heated gas medium. The experiments were conducted in a closed heat exchange chamber space filled with air. The gas medium was heated to 400–500 °...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2021-11, Vol.23 (11), p.1476
Main Authors: Tkachenko, Pavel, Shlegel, Nikita, Strizhak, Pavel
Format: Article
Language:English
Subjects:
Accuracy
Aerosols
Breakup
Bubbles
Coalescing
collision regimes
Droplets
Energy industry
Experiments
Fragments
Heat
Heat exchange
high-temperature gas medium
Industrial applications
interaction
Liquid surfaces
Nozzles
secondary fragments
two-phase droplets
vapor bubbles
Vapors
Velocity
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Summary:The paper presents the experimental research findings for the integral characteristics of processes developing when two-phase liquid droplets collide in a heated gas medium. The experiments were conducted in a closed heat exchange chamber space filled with air. The gas medium was heated to 400–500 °C by an induction system. In the experiments, the size of initial droplets, their velocities and impact angles were varied in the ranges typical of industrial applications. The main varied parameter was the percentage of vapor (volume of bubbles) in the droplet (up to 90% of the liquid volume). The droplet collision regimes (coalescence, bounce, breakup, disruption), size and number of secondary fragments, as well as the relative volume fraction of vapor bubbles in them were recorded. Differences in the collision regimes and in the distribution of secondary fragments by size were identified. The areas of liquid surface before and after the initial droplet breakup were determined. Conditions were outlined in which vapor bubbles had a significant and, on the contrary, fairly weak effect on the interaction regimes of two-phase droplets.
ISSN:1099-4300
1099-4300
DOI:10.3390/e23111476