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以上公式（2）（3）可用来计算金刚石钻进时产生的岩粉颗粒在静止液体中沉降时的速度。当然在推导以上公式时，都是假设岩粉颗粒为球形，而实际上并非球形。但实践证明，当岩粉颗粒很小时，沉降速度与颗粒形状无多大关系。故以上公式可以比较准确地用于金刚石钻进时产生的岩粉。下面以测试用的岩粉粒径计算其相应的沉降速度。（1）石英颗粒：其粒径在显微镜下测得为d=0.064～0.256毫米，密度ρ_Y=2.65克/厘米~3，测试条件为水温20℃时的清水。实际测量时观察到的颗粒直径约为0.256毫米。按公式（3）计算：
The above formula (2) (3) can be used to calculate the velocity of rock powder particles settling in quiescent liquid during drilling. Of course in the derivation of the above formula, it is assumed that the rock powder particles are spherical, but not actually spherical. However, practice shows that when the rock powder particles are small, the sedimentation velocity and the shape of the particles have little to do. Therefore, the above formula can be more accurately used for diamond rock powder generated during drilling. The following test rock particle size to calculate the corresponding settlement rate. (1) Quartz particles: The particle size is d = 0.064-0.256 mm under the microscope and the density ρ_Y = 2.65 g / cm 3. The test conditions are clear water at a water temperature of 20 ° C. The actual particle diameter observed when measuring about 0.256 mm. According to formula (3) Calculate: