OJFD  Vol.3 No.2 A , July 2013
Effect of Disk Edge Profile on Scattering Characteristics of Liquid Droplets Splashed from Spinning Disk
ABSTRACT

Effects of disk edge profile on scattering characteristics of liquid droplets splashed from a rotating disk edge are experimentally investigated. In the present research, aluminum disks are utilized and purified water is employed for liquid. Scattering phenomena of the droplets are captured by the high-speed digital camera. Distribution of the droplet diameter is evaluated from these images and distributions of horizontal flying velocity component and angle of the droplets are measured by human visual observation of images. Liquid filaments are stretched outward from the stagnant liquid layer on lateral surface of disk edge by centrifugal force. Two main peaks appear in the distribution of the scattered droplet diameter and they are originated from large terminal droplets and small droplets generated from filamentwise breakup. Most of the scattered droplets fly slightly inside of the tangential direction of the disk edge. The water droplets splashed from the disk scatters with regularity compared with ethanol droplets.


Cite this paper
M. Munekata, T. Oseto, H. Kurishima and H. Yshikawa, "Effect of Disk Edge Profile on Scattering Characteristics of Liquid Droplets Splashed from Spinning Disk," Open Journal of Fluid Dynamics, Vol. 3 No. 2, 2013, pp. 22-27. doi: 10.4236/ojfd.2013.32A004.
References
[1]   Y. Tanasawa, Y. Miyasaka and M. Umehara, “On the Filamentation of Liquid by Means of Rotating Discs, 3rd Report, Theory of Filament Formation of Liquid,” Transactions of JSME, Journal of Japan Society of Mechanical Engineers, Vol. 25, No. 156, 1959, pp. 897-905. doi:10.1299/kikai1938.25.897

[2]   M. Daikoku, H. Sunanaga and N. Nagai, “Liquid Atomization from the Surface of a Rotating Body, 1st Report, Behavior of Liquid Flow, and Drop Formation on the Rotating Body,” Transactions of JSME, Journal of Japan Society of Mechanical Engineers, Series B, Vol. 54, No. 501, 1988, pp. 1170-1178. doi:10.1299/kikaib.54.1170

[3]   N. Gregory, J. T. Stuart and W. S. Walker, “On the Stability of Three-Dimensional Boundary Layers with Application to the Flow Due to a Rotating Disk,” Philosophical Transactions of the Royal Society of London, Series A, Vol. 248, No. 943, 1955, pp. 155-199. doi:10.1098/rsta.1955.0013

[4]   R. Kobayashi, Y. Kohama and Ch. Takamadate, “Spiral Vortices in Boundary Layer Transition Regime on a Rotating Disk,” Acta Mechanica, Vol. 35, No. 1-2, 1980, pp. 71-82. doi:10.1007/BF01190058

[5]   M. R. Malik, S. P. Wilkinson and S. A. Orszag, “Instability and Transition in Rotating Disk Flow,” AIAA Journal, Vol. 19, No. 9, 1981, pp. 1131-1138. doi:10.2514/3.7849

[6]   H. L. Reed and W. S. Saric, “Stability of Three-Dimensional Boundary Layers,” Annual Review of Fluid Mechanics, Vol. 21, 1989, pp. 235-284. doi:10.1146/annurev.fl.21.010189.001315

[7]   A. Öztekin, D. E. Bornside, R. A. Brown and P. K. Seidel, “The Connection between Hydrodynamic Stability of Gas Flow in Spin Coating and Coated Film Uniformity,” Journal of Applied Physics, Vol. 77, No. 6, 1995, pp. 2297-2308. doi:10.1063/1.358751

[8]   M. Munetaka, A. Noguchi, J. Nishiyama, H. Kurishima and H. Yoshikawa, “Scattering Characteristics of Liquid Droplets Spun Off from Rotating Disk Edge,” Journal of Thermal Science, Vol. 21, No. 1, 2012, pp. 42-48. doi:10.1007/s11630-012-0517-6

[9]   H. S. Allen, “The Motion of a Sphere in a Viscous Fluid,” Philosophical Magazine Series 5, Vol. 50, No. 306, 1900, pp. 519-534. doi:0.1080/14786440009463941

 
 
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