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Engineering Flow and Heat Exchange by Octave Levenspiel

Engineering Flow and Heat Exchange by Octave Levenspiel

Author:Octave Levenspiel
Language: eng
Format: epub
Publisher: Springer US, Boston, MA


(8.4)

For the special case of viscous flow of a sphere, occurring when Re t  < 1, Stokes developed the following theoretical expression for the drag force:

(8.5)

Replacing in equation (8.4) then gives

(8.6)

The lowest curve on Fig. 8.1 shows the relationship of C D vs. Resph, t for spherical particles. The rather long equation for this curve is given by Haider and Levenspiel (1989).

Fig. 8.1Design chart for drag coefficients of single free-falling particles

8.1.2 Nonspherical Particles



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