Plots of average saturation vs. inverse total rate (left) and plots of inverse relative permeabilities of oil and water vs. inverse total rate (right) under different flow fractions and oil viscosities. The results are calculated both using the general solutions (50), (54) and (55) which are valid under all conditions, and using the analytical solution (AnSol) in (50) and (80)–(83). For the case F = 0.01, μ_o = 2.3 cP simulation results from the commercial (COM) software Sendra are added for comparison.