Abstract

This research studies the capacitance variations resulting from water of different sizes, shapes, and positions between conductor plates via simulations using COMSOL Multiphysics. The simulated system includes two 20×20 cm² copper plates parallelly placed 20 cm apart. The simulation is verified using air and water as insertions. The results show that the dielectric constant of water and air, 78. 9 and 1. 00063, agrees with the literature. The capacitance changes due to the location of the surrounding objects become negligible when they are at least 30 cm away from the parallel plates. When the ratio of the dielectric material volume to total volume equals 0.05, a volume ratio variation of 0.01 causes 3.32% in the capacitance changes. A dielectric material of five shapes, i. e., cube, cuboid, cylinder, sphere, and ellipsoid, having an identical volume, has a capacitance variation no greater than 6. 11%. The cuboid object gives the greatest capacitance, while the ellipsoid yields the smallest. Objects of a similar geometrical nature have a less than 3% capacitance difference. The capacitance displays greater values when the material gets closer to either plate. The value decreases as it moves farther from the plate; however, the deviation is less than 3. 09%. Moreover, if the material is placed around the center of the parallel plate, the capacitance is insignificantly altered.