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Explosive disintegration of two-component droplets in a gas flow at its turbulization

ABSTRACT
The experimental results shown that the mode of droplet disintegration dominates in the laminar flow, and the intensive fragmentation is prevalent in the turbulent flow during almost the entire time of heating. Typical dependences of the time of drop heatup before disintegration or fragmentation on the temperature, flow rate, structure and regime (laminar and turbulent) are established. The studies are conducted with heated air and flue gases to ensure the application of the research results in the technology of thermal and flame cleaning of liquids from irregular impurities. It is shown that in the flow of combustion products the droplet disintegration occurs 15-20% faster than in the air flow. In this case, the explosive puffing is more often realized. At high temperatures (more than 400 °C) the characteristics of the explosive droplet disintegration in the studied flows are almost identical (differences in disintegration times do not exceed 5% at different flow turbulization). At lower temperatures, the disintegration times differ 3-4 times for the range Re=2200-3400. In this case, the more Re is, the more intense is the fragmentation of two-fluid droplets throughout the heating time. Due to explosive disintegration of intensely evaporating two-fluid droplets the growth of the relative area of evaporation was 10-25 times.
KEYWORDS
PAPER SUBMITTED: 2018-08-04
PAPER REVISED: 2019-01-28
PAPER ACCEPTED: 2019-02-22
PUBLISHED ONLINE: 2019-03-09
DOI REFERENCE: https://doi.org/10.2298/TSCI180804065A
REFERENCES
  1. Alkaya E., et al., Water recycling and reuse in soft drink/beverage industry: A case study for sustainable industrial water management in Turkey, Resources, Conservation and Recycling, 104 (2015), pp. 172-180.
  2. Fogarassy C., et al., Water footprint based water allowance coefficient, Water Resources and Industry, 7 (2014), pp. 1-8.
  3. Liu, J., et al., Microwave-acid pretreatment: A potential process for enhancing sludge dewaterability, Water Research, 90 (2016), pp. 225-234.
  4. Voitkov I.S., et al., Temperature of gases in a trace of water droplets during their motion in a flame, Thermal science, 22 (2018), pp. 335-346.
  5. Watanabe H., et al., The characteristics of puffing of the carbonated emulsified fuel, International Journal of Heat and Mass Transfer, 52 (2009), pp. 3676-3684.
  6. Suzuki Y., et al., Visualization of aggregation process of dispersed water droplets and the effect of aggregation on secondary atomization of emulsified fuel droplets, Proceedings of the Combustion Institute, 33 (2011), pp. 2063-2070.
  7. Tarlet D., et al., Comparison between unique and coalesced water drops in micro-explosions scanned by differential calorimetry, International Journal of Heat and Mass Transfer, 95 (2016), pp. 689-692.
  8. Tarlet D., et al., The balance between surface and kinetic energies within an optimal micro-explosion, International Journal of Thermal Sciences, 107 (2016), pp. 179-183.
  9. Marchitto L., et al., Optical investigations in a CI engine fueled with water in diesel emulsion produced through microchannels, Experimental Thermal and Fluid Science, 95 (2018), pp. 96-103.
  10. Strizhak P.A., et al., Evaporation, boiling and explosive breakup of oil-water emulsion drops under intense radiant heating, Chemical Engineering Research and Design, 127 (2017), pp. 72-80.
  11. Kim, A.V., et al., Molecular dynamics study of the volumetric and hydrophobic properties of the amphiphilic molecule C8E6, Journal of Molecular Liquids, 189 (2014), pp. 74-80.
  12. Voloshin, V.P., et al., Calculation of the volumetric characteristics of biomacromolecules in solution by the Voronoi-Delaunay technique, Biophysical Chemistry, 192 (2014), pp. 1-9.
  13. Volkov R.S., et al., Using Planar Laser Induced Fluorescence to explore the mechanism of the explosive disintegration of water emulsion droplets exposed to intense heating, International Journal of Thermal Sciences, 127 (2018), pp. 126-141.
  14. Sazhin, S.S., Modelling of fuel droplet heating and evaporation: Recent results and unsolved problems, Fuel, 196 (2017), pp. 69-101.
  15. Sazhin, S.S., et al., Order reduction in models of spray ignition and combustion, Combustion and Flame, 187 (2018), pp. 122-128.
  16. Sazhin, S.S., et al., A mathematical model for heating and evaporation of a multi-component liquid film, International Journal of Heat and Mass Transfer, 117 (2018), pp. 252-260.
  17. Misyura S.Y., The effect of Weber number, droplet sizes and wall roughness on crisis of droplet boiling, Experimental Thermal and Fluid Science, 84 (2017), pp. 190-198.
  18. Zhukov V.E., et al., Dynamics of interphase surface of self-sustaining evaporation front in liquid with additives of nanosized particles, High Temperature, 55 (2017), pp. 79-86.
  19. Varaksin A.Y., Fluid dynamics and thermal physics of two-phase flows: Problems and achievements, High Temperature, 51 (2013), pp. 377-407.
  20. Liu Y., et al., High-performance wastewater treatment based on reusable functional photo-absorbers, Chemical Engineering Journal, 309 (2017), pp. 787-794.
  21. Misyura S.Y., Non-isothermal desorption and nucleate boiling in a water-salt droplet LiBr, Thermal Science, 22 (2018), pp. 295-300.
  22. Misyura S.Y., Contact angle and droplet evaporation on the smooth and structured wall surface in a wide range of droplet diameters, Applied Thermal Engineering, 113 (2017), pp. 472-480.
  23. Charogiannis A., et al., Laser induced phosphorescence imaging for the investigation of evaporating liquid flows, Experiments in Fluids, 54 (2013), pp. 1518-1533.