The fiber length, diameter, cell wall thickness and ratio of length to width are 891.
木纤维长度、直径、双壁厚、长径比均随着树龄的增加而增加，其平均值分别为891。
Simplified analysis on a single fiber fin in the duct flow demonstrates that the heat transfer can be enhanced with the increasing length-to-diameter ratio and thermal conductivity ratio.
对单根纤毛肋进行的简化理论分析表明纤毛长径比和肋材与流体的导热系数比越大其强化换热作用越好。
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