Thanks for the quick response. I am not sure about the response time of the conducting fluid (conductivity ~5 S/m). I'll be using salt water at high concentrations (~ 3.5%). I presume the response time is going to be moderately high. Well, in the event that the field in the gap where the salt water flows is zero, the separation between the plates should not ideally affect the capacitance of the capacitor. Am I right in making this assumption ? Correct me if I'm wrong. I would like to have a list of tools that may help me to model this. I have little clue about emag modelling softwares. Appreciate your help Thanks