At intermediate Reynolds number, many equations which approximate drag coefficients for a sphere are collected in Table 1. These equations may be grouped in five formulas, and the errors between measured values and calculated values by means of these equations are shown in Fig. 1 to 5. When a sphere is accelerated, the mean errors of drag coefficients over initial and final Reynolds number are calculated and illustrated the equi-error diagrams as such “error contour” in Fig. 6 to 10.
A detailed survey has been presented for Mie angular light-scattering equipment that can be used in measuring the size of fine particles suspended in a gas or a liquid stream. Also described are the formulae for computing Mie light scattering intensities. New opto-electronic devices such as integrated photo-diode array appear to be providing powerful tools in rapid and precision measurement of angular light-scattering pattern.