临界直径亦称极限直径。可燃气体混合系在管中火焰不再传播的最大管径。可燃气体混合系在一定的管径范围，火焰传播速度随着管径的减小而减速，当混合系在临界管径或小于临界管径时，便不再燃烧。可燃气混合系在小于15cm管径中流动时为层流运动，火焰传播速度一般在层流状态下测出。
给出了拉速和夹杂临界直径的关系。
A relationship between the casting speed and the critical size of the non-metallic inclusions is given.
得到了不同直径和手性角情况下碳纳米管缺陷形核和断裂的临界应变。
The critical strains of defect formation and fracture occurrence of CNTs with different diameters and chiral angles were obtained.
导出了粒径与临界孔口直径、拱高之间的关系。
The relationships of the particle size, critical hole diameter and arch highness are derived.
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