This integral formula includes Stokes formula.
它还包含了斯托克斯公式。
The experiments and calculation indicate that the common Stokes formula is only suitable to the situation with small grain settling Reynold number.
实验及计算表明：常用的斯托克斯公式仅适应于颗粒沉降雷诺数较小的情况；
Otherwise there will be a large error between the value calculated by Stokes formula and the actual value under the condition of bigger sand grain and lower fluid viscosity.
当砂粒较大、液体粘度较小时，用斯托克斯公式得出的计算值与实际值相差很大。
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