Figure 4.

Separation of baker’s yeast cells using a macroscopic porous medium (a and b). The separation efficiency η plotted against ${\overline{x}}^{⁎}={\left(\mathrm{\Delta }V\right)}^2{d}_{\mathrm{P}}^2{Q}^{-1}\mathrm{Re}\left[K\right]$ can be fitted by Eq. (2) using C⋅h_S as fitting parameters (c). Experiments were conducted using two different applied voltages ΔV = 150 V_RMS and 300 V_RMS and throughputs in the range of Q = 60–540 mLh⁻¹. The employed mullite open cell foam had a fluidic cross-sectional area of 2 cm², a volume based porosity of 83% and a d_50,3 of 230 μm (panel d shows an optical microscopy image of a filter cross section).