No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
Physics of puffing and microexplosion of emulsion fuel droplets
2. J. C. Lasheras, L. T. Yap, and F. L. Dryer, “Effect of the ambient pressure on the explosive burning of emulsified and multicomponent fuel droplets,” Proc. Combust. Inst. 20, 1761 (1984).
5. M. Fuchihata, T. Ida, and Y. Mizutani, “Observation of microexplosions in spray flames of light oil-water emulsions (2nd report, influence of temporal and spatial resolution in high speed videography),” J. Jpn. Soc. Mech. Eng. B 69, 1503 (2003).
7. D. Segawa, H. Yamasaki, T. Kadota, H. Tanaka, H. Enomoto, and M. Tsue, “Water-coalescence in an oil-in-water emulsion droplet burning under microgravity,” Proc. Combust. Inst. 28, 985 (2000).
8. V. Califano, R. Calabria, and P. Massoli, “Experimental evaluation of the effect of emulsion stability on micro-explosion phenomena for water-in-oil emulsions,” Fuel 117, 87 (2014).
9. Y. Suzuki, T. Harada, H. Watanabe, M. Shoji, Y. Matsushita, H. Aoki, and T. Miura, “Visualization of aggregation process of dispersed water droplets and the effect of aggregation on secondary atomization of emulsified fuel droplets,” Proc. Combust. Inst. 33, 2063 (2011).
10. H. Z. Sheng, L. Chen, Z. P. Zhang, C. K. Wu, C. An, and C. Q. Cheng, “The droplet group microexplosions in water-in-oil emulsion sprays and their effects on Diesel engine combustion,” Proc. Combust. Inst. 25, 175 (1994).
13. W. A. Sirignano, Fluid Dynamics and Transport of Droplets and Sprays (Cambridge University Press, Cambridge, 2010).
21. H. Watanabe, Y. Suzuki, T. Harada, H. Aoki, and T. Miura, “Development of a mathematical model for predicting water vapor mass generated in micro-explosion,” Energy 36, 4089 (2011).
23. J. Shinjo and A. Umemura, “Detailed simulation of primary atomization mechanisms in Diesel jet sprays (isolated identification of liquid jet tip effects),” Proc. Combust. Inst. 33, 2089 (2011).
24. J. Shinjo and A. Umemura, “Droplet/turbulence interaction and early flame kernel development in an autoigniting realistic dense spray,” Proc. Combust. Inst. 34, 1553 (2013).
25. G. Wozniak, R. Balasubramaniam, P. H. Hadland, and R. S. Subramanian, “Temperature fields in a liquid due to the thermocapillary motion of bubbles and drops,” Exp. Fluids 31, 84 (2001).
29. M. Sussman, P. Smereka, and S. Osher, “A level set approach for computing solutions to incompressible two-phase flow,” J. Comput. Phys. 114, 146 (1994).
30. M. Sussman and E. G. Puckett, “A coupled level set and volume-of-fluid method for computing 3D and axisymmetric incompressible two-phase flows,” J. Comput. Phys. 162, 301 (2000).
32. T. Himeno and T. Watanabe, “Thermo-fluid management under low-gravity conditions (2nd report: free-surface flows driven by surface forces),” J. Jpn. Soc. Mech. Eng. B 69, 2400 (2003).
41. H. Lamb, Hydrodynamics (Dover, New York, 1945).
45. C. E. Brennen, Cavitation and Bubble Dynamics (Oxford University Press, Oxford, 1995).
48. S. Chandrasekhar, Hydrodynamic and Hydromagnetic Stability (Dover, New York, 1981).
Article metrics loading...
The physics of water-in-oil emulsion droplet microexplosion/puffing has been investigated using high-fidelity interface-capturing simulation. Varying the dispersed-phase (water) sub-droplet size/location and the initiation location of explosive boiling (bubble formation), the droplet breakup processes have been well revealed. The bubble growth leads to local and partial breakup of the parent oil droplet, i.e., puffing. The water sub-droplet size and location determine the after-puffing dynamics. The boiling surface of the water sub-droplet is unstable and evolves further. Finally, the sub-droplet is wrapped by boiled water vapor and detaches itself from the parent oil droplet. When the water sub-droplet is small, the detachment is quick, and the oil droplet breakup is limited. When it is large and initially located toward the parent droplet center, the droplet breakup is more extensive. For microexplosion triggered by the simultaneous growth of multiple separate bubbles, each explosion is local and independent initially, but their mutual interactions occur at a later stage. The degree of breakup can be larger due to interactions among multiple explosions. These findings suggest that controlling microexplosion/puffing is possible in a fuel spray, if the emulsion-fuel blend and the ambient flow conditions such as heating are properly designed. The current study also gives us an insight into modeling the puffing and microexplosion of emulsion droplets and sprays.
Full text loading...
Most read this month