Fig. 2
From: Oscillatory interactions of two spheres in an unbounded couple stress fluid
Drag force versus time t for different values of first couple stress parameters with \(a_2/a_1=1.0, \bar{\eta }'=0.01,U_2/U_1=4.0,\delta \rightarrow \infty\) for low frequency at \(\alpha =0.5\) (a) in-phase, (b) out-of-Phase.
