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Post-Impact Characteristics of a Diesel-in-Water Emulsion Droplet on a Flat Surface Below the Leidenfrost Temperature

1Mechanical Engineering Department, Mustansiriayah University, Baghdad, Iraq

2Mechanical Engineering Department, Mustansiriyah University, Baghdad, Iraq

3Department of Mechanical Engineering, The University of Sheffield, Sheffield, United Kingdom

Received: 9 Sep 2020; Revised: 12 Dec 2020; Accepted: 31 Dec 2020; Available online: 2 Jan 2021; Published: 1 May 2021.
Editor(s): H Hadiyanto
Open Access Copyright (c) 2021 The Authors. Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Citation Format:
Droplet impingement on solid surfaces takes place in a variety of industrial and environmental applications. However, there are still some areas that are not fully comprehended; emulsion droplet impact on a heated surface is one of these areas that require further comprehension. Hence, the present work represents an experimental exploration for spread characteristics of diesel-in-water (DW) emulsion droplet impacting a heated flat plate. Three different emulsions in which water concentration is set to 10%, 20%, and 30% of the overall emulsion content by volume have been tested in addition to the neat diesel. The temperature of the flat plate is varied over the range 20, 40, 60, and 80ºC respectively. Magnified high speed direct imaging and shadowgraphy have been used simultaneously for tracking droplet spread over the heated surface post impact. Droplet spread rate, maximum diameter, rebound height and velocity represent the main evaluated parameters. The results show that the maximum spread diameter is proportional while spread rate is inversely proportional to the increase in plate temperature for all diesel concentrations including the neat diesel. Whereas, droplet rebound height and velocity are found to be more responsive to the variation in diesel concentration than the variation in plate temperature, so they are both minimum in the case of neat diesel and are increasing by the decrease of diesel concentration in the emulsions.
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Keywords: droplet impact; diesel; diesel-in-water emulsion; spread; Leidenfrost; heated flat plate
Funding: Mechanical Engineering Department, Mustansiriyah University; Combustion Diagnosis lab, Department of Mechanical Engineering, The University of Sheffield

Article Metrics:

  1. Alizadeh, A., Bahadur, V., Zhong, S., Shang, W., Li, R., Ruud, J., Yamada, M., Ge, L., Dhinojwala, A., & Sohal, M. (2012). Temperature Dependent Droplet Impact Dynamics on Flat and Textured Surfaces. Applied Physics Letters, 100(11), 111601.
  2. Ashikhmin, A. E., Khomutov, N. A., Piskunov, M. V., & Yanovsky, V. A. (2020). Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall. Applied Sciences, 10, 685.
  3. Bielaczyc, P., Szczotka, A., & Woodburn, J. (2014). Cold Start Emissions of Spark-Ignition Engines at Low Ambient Temperatures as an Air Quality Risk. Archives of Environmental Protection, 40(3), 86-100.
  4. Borisov, A. A., Gel'fand, B. E., Natanzon, M. S., & Kossov, O. M. (1981). Droplet Breakup Regimes and Criteria for their Existence. Journal of Engineering Physics, 40(1), 44-49
  5. Califano, V., Calabria, R., & Massoli, P. (2014). Experimental Evaluation of the Effect of Emulsion Stability on Micro-Explosion Phenomena for Water-in-Oil Emulsions. Fuel, 117, 87-94.
  6. Castanet, G., Dunand, P., Caballina, O., & Lemoine, F. (2013). High-Speed Shadow Imagery to Characterize the Size and Velocity of the Secondary Droplets Produced by Drop Impacts onto a Heated Surface. In Experiments in Fluids (Vol. 54, Issue 3).
  7. Cen, C., Wu, H., Lee, C., Fan, L., & Liu, F. (2019). Experimental Investigation on the Sputtering and Micro-Explosion of Emulsion Fuel Droplets during Impact on a Heated Surface. International Journal of Heat and Mass Transfer, 132, 130-137.
  8. Chakaneh, J. Z., Javid, S. M., & Passandideh-Fard, M. (2019). Surface Roughness Effect on Droplet Impact Characterization: Experimental and Theoretical Study. Journal of Mechanical Engineering and Sciences, 13(2), 5104-5125.
  9. Crookes, R. J., Kiannejad, F., & Nazha, M. A. A. (1997). Systematic Assessment of Combustion Characteristics of Biofuels and Emulsions with Water for Use as Diesel Engine Fuels. Energy Conversion and Management, 38(15-17), 1785-1795.
  10. Dunand, P., Castanet, G., Gradeck, M., Maillet, D., & Lemoine, F. (2013). Energy Balance of Droplets Impinging onto a Wall Heated above the Leidenfrost Temperature. International Journal of Heat and Fluid Flow, 44, 170-180.
  11. Faik, A. M. D. (2017). Quantitative Investigation of the Multicomponent Fuel Droplet Combustion Using High Speed Imaging and Digital Image Processing (Issue August). The University of Sheffield
  12. Faik, A. M. D., & Zhang, Y. (2018). Multicomponent Fuel Droplet Combustion Investigation using Magnified High Speed Backlighting and Shadowgraph Imaging. Fuel, 221(December 2017), 89-109.
  13. Faik, A. M. E.-D., & Zhang, Y. (2020). Liquid-Phase Dynamics during the Two-Droplet Combustion of Diesel-Based Fuel Mixtures. Experimental Thermal and Fluid Science, 115, 110084.
  14. Faik, A. M. E. (2018). The Effect of Diesel-Alcohol Blends on The Cold-Start Combustion of a Compression Ignition Engine. Journal of Engineering and Sustainable Development, 22(02), 20-29.
  15. Gayatri, P., Das, P. K., & Manna, I. (2015). Droplet Oscillation and Pattern Formation during Leidenfrost Phenomenon. Experimental Thermal and Fluid Science, 60, 346-353.
  16. Ithnin, A. M., Ahmad, M. A., Bakar, M. A. A., Rajoo, S., & Yahya, W. J. (2015). Combustion Performance and Emission Analysis of Diesel Engine Fuelled with Water-in-Diesel Emulsion Fuel Made from Low-Grade Diesel Fuel. Energy Conversion and Management, 90, 375-382.
  17. Jackson, G. S., & Avedisian, C. T. (1998). Combustion of Unsupported Water-in-n-Heptane Emulsion Droplets in a Convection-Free Environment. International Journal of Heat and Mass Transfer, 41(16), 2503-2515.
  18. Jin, Z., Sui, D., & Yang, Z. (2015). The Impact, Freezing, and Melting Processes of a Water Droplet on an Inclined Cold Surface. In International Journal of Heat and Mass Transfer (Vol. 90, pp. 439-453).
  19. Jin, Z., Zhang, H., & Yang, Z. (2016). The Impact and Freezing Processes of a Water Droplet on a Cold Surface with Different Inclined Angles. International Journal of Heat and Mass Transfer, 103, 886-893.
  20. Jowkar, S., & Morad, M. R. (2019). Rebounding Suppression of Droplet Impact on Hot Surfaces: Effect of Surface Temperature and Concaveness. In Soft Matter (Vol. 15, Issue 5, pp. 1017-1026).
  21. Leal-Calderon, F., Schmitt, V., & Bibette, J. (2007). Emulsion Science Basic Principles (2nd Editio). Springer
  22. Li, D., & Duan, X. (2019). Numerical Analysis of Droplet Impact and Heat Transfer on an Inclined Wet Surface. International Journal of Heat and Mass Transfer, 128, 459-468.
  23. Li, H., Waldman, R. M., Zhang, K., & Hu, H. (2017). Quantification of Dynamic Water Droplet Impact onto a Solid Surface by using a Digital Image Projection Technique. In AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting.
  24. Mollet, H., & Grubenmann, A. (2001). Formulation Technology: Emulsions, Suspensions, Solid Forms. Wiley-VCH.
  25. Moon, J. H., Cho, M., & Lee, S. H. (2016). Dynamic Wetting and Heat Transfer Characteristics of a Liquid Droplet Impinging on Heated Textured Surfaces. International Journal of Heat and Mass Transfer, 97, 308-317.
  26. Pulkrabek, W. W. (1997). Engineering Fundamentals of the Internal Combustion Engine. Prentice Hall
  27. Qi, W., & Weisensee, P. B. (2020). Dynamic Wetting and Heat Transfer during Droplet Impact on Bi-phobic Wettability-Patterned Surfaces. In Physics of Fluids (Vol. 32, Issue 6).
  28. Qiao, Y. M., & Chandra, S. (1996). Boiling of Droplets on a Hot Surface in Low Gravity. International Journal of Heat and Mass Transfer, 39(7), 1379-1393.
  29. Raman, K. A., Jaiman, R. K., Lee, T. S., & Low, H. T. (2016). Lattice Boltzmann Simulations of Droplet Impact onto Surfaces with Varying Wettabilities. In International Journal of Heat and Mass Transfer (Vol. 95, pp. 336-354).
  30. Rueda Villegas, L., Tanguy, S., Castanet, G., Caballina, O., & Lemoine, F. (2017). Direct Numerical Simulation of the Impact of a Droplet onto a Hot Surface above the Leidenfrost Temperature. In International Journal of Heat and Mass Transfer (Vol. 104, pp. 1090-1109).
  31. Samuel, R. A., & Valan, A. A. (2014). Prediction of Cold Start Hydrocarbon Emissions of Air Cooled Two Wheeler Spark Ignition Engines by Simple Fuzzy Logic Simulation. Thermal Science, 18(1), 179-191.
  32. Sen, U., Roy, T., Ganguly, R., Angeloni, L. A., Schroeder, W. A., & Megaridis, C. M. (2020). Explosive Behavior during Binary-Droplet Impact on Superheated Substrates. International Journal of Heat and Mass Transfer, 154, 119658.
  33. Shi, Z., Lee, C., Wu, H., Li, H., Wu, Y., Zhang, L., & Liu, F. (2019). Effect of Nozzle Diameter on Macroscopic Spray Behavior of Heavy-Duty Diesel Engine under Cold-Start Conditions. Atomization and Sprays, 29(8), 741-762.
  34. Tanaka, R., Matsumoto, S., Kaneko, A., & Abe, Y. (2011). The Effect of Rotation on Resonant Frequency of Interfacial Oscillation of a Droplet using Electrostatic Levitator. Journal of Physics: Conference Series, 327, 012021.
  35. Tanimoto, D., & Shinjo, J. (2019). Numerical Simulation of Secondary Atomization of an Emulsion Fuel Droplet due to Puffing: Dynamics of Wall Interaction of a Sessile Droplet and Comparison with a Free Droplet. Fuel, 252, 475-487.
  36. Vellaiyan, S., Amirthagadeswaran, K. S. (2016). The Role of Water-in-Diesel Emulsion and its Additives on Diesel Engine Performance and Emission Levels: A Retrospective Review. Alexandria Engineering Journal, 55(3), 2463-2472.
  37. Wamankar, A. K., Satapathy, A. K., & Murugan, S. (2015). Experimental Investigation of the Effect of Compression Ratio, Injection Timing & Pressure in a DI (Direct Injection) Diesel Engine Running on Carbon Black-Water-Diesel Emulsion. Energy, 93, 511-520.
  38. Wang, L., Zhang, R., Zhang, X., & Hao, P. (2017). Numerical Simulation of Droplet Impact on Textured Surfaces in a Hybrid State. Microfluid Nanofluid, 21(61).
  39. Wang, Z., Li, Y., Wang, C., Xu, H., & Wyszynski, M. L. (2016). Near-Nozzle Microscopic Characterization of Diesel Spray under Cold Start Conditions with Split Injection Strategy. Fuel, 181, 366-375.
  40. Yang, Z., Liu, F., & Li, Y. (2020). Autoignition Characteristics of Diesel Spray under Different Injection Pressures and Cold Start Strategy for Compression Ignition Engines. International Journal of Engine Research.
  41. Zhang, R., Hao, P., Zhang, X., & He, F. (2018). Supercooled Water Droplet Impact on Superhydrophobic Surfaces with Various Roughness and Temperature. International Journal of Heat and Mass Transfer, 122, 395-402.

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