The Effect of Diffuser Angle on the Discharge Coefficient of a Miniature Critical Nozzle

查看全文 作　　者：Jae Hyung [1]Kim;Heuy Dong [1]Kim;Toshiaki [2]Setoguchi

机构地区：[1]School of Mechanical Engineering,Andong National University,Andong,760-749,Korea;[2]Department of Mechanical Engineering,Saga University,1,Honjo,Saga,Japan

出　　处：《Journal of Thermal Science》索引2010年第19卷第3期,共6页

摘　　要：Many researches on critical nozzles have been performed to accurately measure the mass flow rate of gas flow,and to standardize the performance as a flow meter.Recently,much interest is being paid on the measurement of very small mass flow rate in industry fields such as MEMS applications.However,the design and performance data of the critical nozzles obtained so far have been applied mainly to the critical nozzles with comparatively large diameters,and the works available on miniature critical nozzles are lacking.In the present study,a computational fluid dynamics method has been applied to investigate the influence of the diffuser angle on discharge coefficient of the miniature critical nozzles.In computations,the throat diameter of critical nozzle is varied from 0.2 mm to 5.0 mm and the diffuser angle is changed from 2 deg to 8 deg.The computational results are validated with some experimental data available.The results show that the present computational results predict appropriately the discharge coefficient of the gas flows through miniature critical nozzles.It is known that the discharge coefficient is considerably influenced by the diffuser angle,as the throat diameter of nozzle becomes small below a certain value.This implies that the miniature critical nozzles should be carefully designed. 关键词：喷嘴直径扩散角微型临界质量流量放电流动性能计算系数

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The Effect of Diffuser Angle on the Discharge Coefficient of a Miniature Critical Nozzle

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