Drag coefficient correlation

Figure 8-14 Drag coefficient correlation. Data from API RP 521, Guide for Pressure-Relieving and Depressurizing Systems, 2d ed. (Washington, DC American Petroleum Institute, 1982).

Schiller, L. and Naumann, A.Z., Uber die grundlegenden Berechnungen bei der Schwerkraftaufbereitung [A fundamental drag coefficient correlation], Z. Ver. Dent. Ing., 77 (1933) 318-320. 

Up — Uc represents the resultant slip velocity between the particulate and continuous phase. Some other commonly used drag coefficient correlations are listed in Appendix 4.2. For fluid particles such as gas bubbles or liquid drops, the drag coefficient may be different than that predicted by the standard drag curve, due to internal circulation and deformation. For example, Johansen and Boysen (1988) proposed the following equation to calculate Cd, which is valid for ellipsoidal bubbles in the range 500 < Re < 5000 ... 

Gibilaro LG, Di Felice RI, Waldran SP (1985) Generalized Motion factor and drag coefficient correlations for fluid-particle interactions. Chem Eng Sci 40 1817-1823... 

Ergun, S. 1952 Fluid flow through packed columns. Chtan. Eng. Prog. 48(2), 89-94, 1952. Gibilaro, L. G., Felice, R. I. D., and Waldram, S. P. Generalized ftiction factor and drag coefficient correlations for fluid-particle interactitms. Chem. Eng. Sci. 40, 1817-1823, 1985. 

Table 2.1 Reynolds number ranges for single particle drag coefficient correlations...

By combining Eq. (44) and the recommended drag coefficient correlations in Table 8 or drag coefficient equations proposed by Turton and Levenspiel (1986), Eq. (34), and Haider and Levenspiel (1989), Eq. (35), the terminal velocity can be calculated. Haider and Levenspiel further suggested an approximate method for direct evaluation of the terminal velocity by defining a dimensionless particle size, d, and a dimensionless particle velocity, U, by... 

Schiller, L., Naumann, A. (1933). A drag coefficient correlation. Zeitschrift des Vereins Deutscher Ingenieure, 77, 318-320. 

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