Figure 5.

Comparison of the theoretical real-time urea clearance (see Equation (15)) to two multi-pass benchtop experiments with the sheet membrane device. Agreement was observed to match theory, thus showing that our model for $K=kr\left(A_{mp}/A_{sp}\right)kr\gamma$ is accurate (see Equation (18)). A_mp = 2.88 × 10^–4 m²; A_sp =1.4 × 10^–6 m². (Experiment 1: R² = 0.98; Experiment 2: R² = 0.96.)