円筒容器底の円形オリフィスの流量係数 : 液面降下空気中流出の場合

概要

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The discharge coefficient of a circular orifice set concentrically to the bottom of a circular cylinder vessel was studied experimentally in the flow into the air under the head lowering with the time. The discharge coefficient of orifices C_d was determined by the conventional formula and the effect of several factors (Reynolds number Re, Weber number W_r, diameter ratio D/d, thickness-diameter ratio h/d and dimensionless head H/d) to C_d was discussed. It was found that C_d decreased with an increase of Re under a constant value of W_r, C_d was almost independent of D/d and C_d increased with an increase of h/d. Besides, we tried to formulate the effect of some factors (Re, W_r and h/d) to C_d and proposed an experimental formula in the range of Re=1100-14500, W_r=100-700 and h/d=0.1-0.4.
社団法人日本機械学会の論文
1990-08-25