以下为句子列表：
英文: When the punched baffle is proper in length, the small holes are in staggered arrangement and the punched ratio gradually increases from the central axis to the boundary along the baffle length, the performance of flow distribution in the plate-fin heat e
中文: 从实验对比分析中得出，当挡板小孔呈错排分布、开孔率沿挡板的中轴线向两侧逐渐增加、且总开孔率达到50%左右的时候，在相同的入口条件下，不均匀系数由原始封头的1.210降至0.209，最大流速与最小流速之比由23.163降至1.756。
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