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等效球直径(英语:equivalent spherical diameter,简称ESD)为一科学名词,是指一不规则外形物体,其体积相同球体的直径[1]。
根据IUPAC的定义[2],非圆形物体的等效直径等于非圆形物体有相同性质(空气力学、水力学、光学、电学)球体的直径。若考虑在非紊流运动下的物体,等效直径等于斯托克斯定律中的直径。
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