Petroleum Science

, Volume 8, Issue 1, pp 108–113

A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient



According to the experimental data of the orifice discharge coefficient for the flow through a vertical sharp-edged orifice obtained in the previous study of this work, a theoretical criterion for flow mechanisms of small orifice (viz. thick-walled orifice and nozzle) and large orifice (viz. thin-walled orifice) was proposed based on the ratio of orifice diameter to plate thickness. It can help explain the dissipation of the mechanical energy loss in the flow process for the two flow mechanisms under different operating regimes. The main parameters such as orifice diameter, plate thickness and liquid head were correlated, and a semi-empirical model for orifice coefficient and an empirical model with high precision at the stable region were developed.

Key words

Orifice discharge coefficient theoretical criterion model ratio of orifice diameter to plate thickness Reynolds number liquid head 


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  1. Borutzky W, Barnad B and Thoma J. An orifice flow model for laminar and turbulent conditions. Simulation Modelling Practice and Theory. 2002. (10): 141–152Google Scholar
  2. Cao R, Liu Y S, Yan C Y, et al. Characteristics of the vertical sharpedged orifice discharge (I): Effect of flow regime and configuration parameters on orifice discharge coefficient. Journal of Chemical Industry and Engineering (China). 2008a. 59(9): 2175–2180 (in Chinese)Google Scholar
  3. Cao R, Liu Y S, Yan C Y, et al. Characteristics of vertical sharp-edged orifice discharge (II): Behavior of fluid in contributing flow region in front of orifice. Journal of Chemical Industry and Engineering (China). 2008b. 59(11): 2741–2749 (in Chinese)Google Scholar
  4. Finnemore E J and Franzini J B. Fluid Mechanics with Engineering Applications. Beijing: Mechanical Industry Press. 2006. 381–388 (in Chinese)Google Scholar
  5. Fossa M and Guglielmini G. Pressure drop and void fraction profiles during horizontal flow through thin and thick orifices. Experimental Thermal and Fluid Science. 2002. 26: 513–523CrossRefGoogle Scholar
  6. Jamal M S. Fluid Flow Handbook. Beijing: China Petrochemical Press. 2004. 149 (in Chinese)Google Scholar
  7. Jin Z M. Hydraulic Pressure Fluid Mechanics. Beijing: National Defense Industry Press. 1994. 206–213 (in Chinese)Google Scholar
  8. Kremlevsky ЛЛ. Flowmeter. Beijing: Hydraulic and Electrical Engineering Press. 1958. 27–29 (in Chinese)Google Scholar
  9. Lan zhou Petroleum Machinery Research Institute. Contemporary Tower Technology (Second Edition). Beijing: China Petrochemical Press. 2005. 236–238, 503–508 (in Chinese)Google Scholar
  10. Li Y M and Yu X M. Study of vapor-liquid flow states of hanging downcomer bottom-orifices. Chemical Engineering. 2006. 34(10): 24–26, 62 (in Chinese)Google Scholar
  11. Liang G W. Flow Measurement Technology and Instruments. Beijing: Mechanical Industry Press. 2002. 47–51 (in Chinese)Google Scholar
  12. Lu H Q. Theory and Application of Jetting technology. Wuhan: Wuhan University Press. 2004. 59–74 (in Chinese)Google Scholar
  13. Luo T Q. Fluid Mechanics. Beijing: Mechanical Industry Press. 2007. 74–78 (in Chinese)Google Scholar
  14. Ramamurthi K and Nandakumar K. Characteristics of flow through small sharp-edged cylindrical orifices. Flow measurement and Instrumentation. 1999. (10): 133–143Google Scholar
  15. Sheng J C. Hydraulic Pressure Fluid Mechanics. Beijing: Mechanical Industry Press. 1980. 172–199 (in Chinese)Google Scholar
  16. Wang Z Q. Viscous Fluid Mechanics. Haerbin: Haerbin Industry University Press. 1990. 233–235 (in Chinese)Google Scholar
  17. Yu G C. Chemical Mechanical Engineering Handbook (Volume I). Beijing: Chemistry Industry Press. 2003. 3–56 (in Chinese)Google Scholar
  18. Zhang J C and Dong Y R. Experiment to the orifice discharge coefficient of orifice-typed liquid distributor of packed tower. Chemical Engineering. 2000. 28(3): 10–12, 48 (in Chinese)Google Scholar
  19. Zhao X X, Yao K J, Wang L H, et al. Experimental study and CFD numerical simulation on discharge coefficients of tapered sieve tray. Petrochemical Technology. 2004. 33(5): 428–431 (in Chinese)Google Scholar

Copyright information

© China University of Petroleum (Beijing) and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.State Key Laboratory of Heavy Oil ProcessingChina University of PetroleumBeijingChina

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