Interaction of droplets and carbon particles exposed to a high-temperature air counterflow
| Parent link: | International Journal of Multiphase Flow.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 194.— 2026.— Article number 105485, 16 p. |
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| Other Authors: | , , , |
| Summary: | Title screen The removal of dispersed solid particles, such as dust, from gas and liquid flows is a critical objective due to its significant implications for the environment and human health. This study reports on the interaction of water droplets (1–1.6 mm in size) and solid particles (0.4–1.6 mm in size) exposed to a counterflow of air. This research is the first to investigate the collisions of water droplets with coal particles and coal combustion products, when varying the ambient conditions (the flow temperature and velocity) in ranges typical of real industrial processes. Particles of coal and its combustion products were the kind of solid particles chosen for research. The temperature and counterflow velocity were 50 to 100 °С and 1 to 2 m/s, respectively. Two regimes of droplet-particle interaction were identified. They were agglomeration and separation. The drag coefficient of droplets and particles exposed to an airflow was calculated. In the collisions of droplets with coal combustion products, the critical Weber number decreased on average by 51%, while the drag coefficient increased by about 29%, compared to the case of droplets colliding with coal particles. A relationship between the drag coefficient and dimensionless Reynolds, Froude, Stokes and capillary numbers was obtained. The energy balance was calculated in the zone of occurrence of different droplet-particle collision regimes. At We <50 and linear impact parameter equaling 0, the surface energy of droplets exceeds their kinetic energy and accounts for more than 50% of the total initial energy of the droplet. The ranges of the Stokes number in which the droplet settles on the particle were determined. Approximations describing the interaction of water droplets with solid particles and demonstrating the transition boundary between regimes were derived. The research findings can be applied in dust collection and dust removal technologies Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.ijmultiphaseflow.2025.105485 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=682664 |