Browse > Article
http://dx.doi.org/10.3795/KSME-B.2010.34.10.933

Experimental Study of Discharge Coefficient and Cavitation for Different Nozzle Geometries  

Kim, Sung-Ryoul (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
Ku, Kun-Woo (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
Hong, Jung-Goo (Institute of Mechanical Engineering Technology, Kyungpook Nat'l Univ.)
Lee, Choong-Won (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.34, no.10, 2010 , pp. 933-939 More about this Journal
Abstract
The purpose of this study is to investigate the generation and development of cavitation in circular and elliptical nozzles. In order to investigate the influence of cavitation, the experiment was conducted with a set of elliptical nozzles that had the same cross-sectional area, different orifice aspect ratios (a/b). Each nozzle was made of acrylic so that visualization was possible. With the injection pressure, the internal flow of the nozzle was classified into the no-cavitation, cavitation, and hydraulic-flip regions. Regardless of the nozzle geometry, with the injection pressure, the flow rate in the no-cavitation and cavitation regions increased and the discharge coefficient decreased. However, the flow rate was constant in the hydraulic-flip region. In the elliptical nozzles, the generation and development of cavitation occurred at higher cavitation number than that in the case of a circular nozzle.
Keywords
Elliptical Nozzle; Nozzle Cavitation; Discharge Coefficient; Cavitation Number;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 3
연도 인용수 순위
1 Sou, A., Hosokawa, S. and Tomiyama, A., 2007, "Effects of Cavitation in a Nozzle on Liquid Jet Atomization," International journal of Heat and Mass Transfer, Vol. 50, lss. 17-18, pp. 3575-3582.   DOI   ScienceOn
2 Stanley, C., Rosengarten, G., Milton, B. and Barber, T., 2008, "Investigation of Cavitation in a Large-Scale Transparent Nozzle," FISITA 2008 Student Congress, F2008-SC-001.
3 Ramamurthi, K. and Nandakumar, K., 1999, "Characteristics of Flow Through Small Sharp-Edged Cylindrical Orifices," Flow Measurement and Instrumentation 10, pp. 133-143.   DOI   ScienceOn
4 Park, S. H., Suh, H. K. and Lee, C. S., 2007, "Effects of Nozzle Orifice Shape and Nozzle Length-to-Diameter Ratio on Internal and External Flow Characteristics of Diesel and Biodiesel Fuel," Trans. of the KSME(B), Vol. 31, No. 3, pp. 264-272.
5 Gong, Y., Liu, C., Huang, Y. and Peng, Z., 1998, "An Experimental Study on Droplet Size Characteristics and Air Entrainment of Elliptic Sprays," SAE technical paper series, 982545.
6 Kasyap, T. V., Sivakumar, D. and Raghunandan, B.N., 2009, "Flow and Breakup Characteristics of Elliptical Liquid Jets," International journal of Multiphase Flow, V. 35, pp. 8-19.   DOI   ScienceOn
7 Sato, K. and Saito, Y., 2002, "Unstable Cavitation Behavior in a Circular Cylindrical Orifice Flow," JSME International Journal Series B, Vol.45, No.3, pp. 638-645.   DOI   ScienceOn
8 Potter, M. C. and Wiggert, D. C., 2002, Mechanics of Fluid, BROOKS/COLE, USA, pp.106-116.
9 Lefebvre, A. H., 1989, Atomization and Spray, Hemisphere Publishing Corporation, USA, pp.201-307.
10 Lee, S. Y., 1996, Liquid Atomization, Minumsa, korea, pp.165-278.