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

Petroleum Science, Feb 2011

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.

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

A criterion for ow mechanisms through vertical sharp-edged ori ce and model for the ori ce discharge coef cient Cao Rui Liu Yansheng Yan Chaoyu - 1 Introduction C 2 Theory criterion for orifice discharge mechanism t t t C d t d L t E 7°-15° Flowing direction C d d 3.0 2.5 /s 2.0 m , y itc 1.5 o l e v id 1.0 u q i L 0.5 0.0 3 Model correlations for ori ce discharge 3.1 Correlation of orifice discharge coefficient (Co) with liquid head (h) and con guration dimensions P u kd d u' k u u t d u u P P hg u P u u R t d d u u u R kd R d 1 h kd d u u u ' 2u2 u 3.1.1 Correlations for small ori ce kd d u d d Turbulent ow Re -14.19% -10.38% h h 0.0 0.2 0.8 1.0 0.4 0.6 Experimental data of Co 0.2 3.1.2 Correlations for large ori ces Small orifice +15.34% Large hole o C f o s e u l a v n i t it F 0.8 0.6 -9.28% C C d u t -16.45% C 4 Conclusions f C Acknowledgements


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Rui Cao, Yansheng Liu, Chaoyu Yan. A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient, Petroleum Science, 2011, 108-113, DOI: 10.1007/s12182-011-0122-4