Fig. 5
From: A theoretical model for capacitance measurement of liquid films in an annular flow
Planar model: graph of capacitance/metre against electrode-casing distance for a liquid layer of thickness 2 mm, calculated for both water and oil using COMSOL, both theoretical methods and the parallel plate approximation. The value for water-point strength at 4-mm plate-casing separation is 7.7×10−10 F/m and so is not displayed on the graph. Lines have been drawn between points for clarity only