4 for a pore doublet show that in general for v velocity in the pore r
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4- For a pore doublet, show that in general for v, (velocity in the pore r2) to be positive, weshould have: \bar{v}_{1}>\frac{\sigma \cos \theta r_{1}^{2}}{4 \mu L}\left(\frac{1}{r_{1}}-\frac{1}{r_{2}}\right)