Fig. 10
From: Oscillatory interactions of two spheres in an unbounded couple stress fluid
Drag force versus couple stress parameter \(\bar{\eta }\) for different values of frequency parameter with \(a_2/a_1=0.1,U_2/U_1=0.5,\bar{\eta }=0.1,\bar{\eta }'=0.01,\delta \rightarrow \infty , t=4.0\) at \(\alpha =0.5\) (a) in-phase, (b) out-of-phase.
