Table 1.

Experimental values

Outer radius of rotors	$a=1.3$ mm
Grid size	${\ell }_1=4.0$, ${\ell }_2=6.3$ mm
Magnetic moment of rotors	$m=2.0\times 10^{-4}$ $\mathrm{A}\cdot {\mathrm{m}}^2$
External magnetic field strength	$B_1=1.5$, $B_2=6.0$ mT
External magnetic field frequency	$f=1.0$ Hz
Fluid viscosity	$\eta =1.4$ Pa $\cdot$ s
Fluid density	$\rho =1.3\times 10^3$ $\mathrm{kg}{\mathrm{m}}^{-3}$
Reynolds number	$Re=1.57\times 10^{-3}$
Condition 1	$\alpha =0.4$, $\beta =0.3$
Condition 2	$\alpha =6.0$, $\beta =0.3$