The Effect of Distance between $90^{\circ}$Elbow close to Upstream Face of Orifice Plate and Orifice Plate on Discharge Coefficient

오리피스 전단에 인접한 $90^{\circ}$엘보와 오리피스간의 거리가 유출계수에 미치는 영향

The effect of distance between ninety degree elbow close to upstream face of orifice plate and orifice plate on discharge coefficient was investigated. The distributions of discharge coefficient and differential pressure caused by elbow and short upstream straight length were examined and modified discharge coefficient was introduced. The results presented in this study could be useful when orifice plate is installed under the condition of simple flow disturbance element and short upstream straight length.