Collisions between liquid droplets during the intersection of aerosol flows in a heated gas
| Parent link: | Thermal Science and Engineering Progress Vol. 34.— 2022.— [101425, 12 p.] |
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| Περίληψη: | Title screen The paper presents the experimental findings on the water droplet collision behavior during the intersection of two aerosol flows in a high-temperature gas environment. Aerosol flows were produced by two strip pattern nozzles angled at 45° towards each other in the same plane. The resulting flow had an opening angle of 60°. The droplet impact angle (?d) was varied from 0 to 90°, droplet radii (Rd1, Rd2) from 0.1 to 1.2 mm, and droplet velocities (Ud1, Ud2) from 2 to 12 m/s. The gas temperature in the droplet collision zone was varied using an induction heater with an internal volume of about 0.13 m3 with viewing windows to record the key parameters (number, size, velocities, and trajectories) of liquid fragments before and after collision. The air temperature ranged from 20 to 400 °C in the experiments. Using a high-speed video camera, we recorded four collision regimes: coalescence, separation, disruption, and bounce. We also identified the main differences in the number and size of secondary droplets formed in an aerosol flow after the collision of two primary ones. A temperature rise led to an increase in the number of secondary fragments. The size distributions of secondary fragments are presented for three ranges of size ratios of initial droplets: ? < 0.3; 0.3 < ? < 0.7; ? > 0.7. The impact of droplet collisions on their size variation rates was estimated at the gas temperature Tg = 20–400 °C. Finally, we compared the contribution of this factor and evaporation without droplet-droplet collisions. Режим доступа: по договору с организацией-держателем ресурса |
| Γλώσσα: | Αγγλικά |
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2022
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| Διαθέσιμο Online: | https://doi.org/10.1016/j.tsep.2022.101425 |
| Μορφή: | Ηλεκτρονική πηγή Κεφάλαιο βιβλίου |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668527 |