An Introduction to Modeling and Simulation of Particulate Flows Part 3 pdf

05 book

2007/5/15

page 20

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20 Chapter 2. Modeling of particulate flows

IMPACT VELOCITY

e −

EMPIRICALLY

OBSERVED

e

eo

IDEALIZATION

V*

Figure 2.4. Qualitative behavior of the coefficient of restitution with impact ve￾locity (Zohdi [212]).

where v∗ is a critical threshold velocity (normalization) parameter, the relative velocity of

approach is defined by

!vn

def = |vj n(t) − vin(t)|, (2.51)

and e− is a lower limit to the coefficient of restitution.