Fig. 8
From: Oscillatory interactions of two spheres in an unbounded couple stress fluid
Drag force versus time t for different values of velocity ratio parameters with \(a_2/a_1=0.1,U_2/U_1=0.5,\bar{\eta }=0.001,\bar{\eta }'=0.01, \delta \rightarrow \infty\) for high frequency at \(\alpha =60.0\) (a) in-phase, (b) out-of-phase.
