Figure 2.20 Elastic (spring) model.
2.7.2 Viscous (Dashpot) Model
A dashpot is shown in Fig. 2.21. The rate of extension varies linearly with the force acting on the system:
where C is a constant proportional to the diameter of the holes.
The dashpot is considered as an ideal fluid element obeying Newton's law in which force is pro portional to rate of extension:
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