Perforated plates correspond to heterogeneous media.
多孔板相当于均匀介质。
A packed bed of granular material sandwiched by two perforated plates, is a good distributor.
两块孔板中间填有一层颗粒物料，是一种很好的分布板。
Based on the numerical results, the curve-fitting expressions for the acoustic impedance of perforated plates with cross flow and grazing flow are obtained.
综合无流、有流情况下穿孔板声阻抗的近似公式，给出穿孔元件声阻抗新模型。
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