The Effect of Size, Shape, and Position of Water on Capacitance by Finite Element Simulation using COMSOL Multiphysics
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. Keywords : Simulation ; Parallel plate ; CapacitanceReferences
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Soltani, M., Alimardani, R., & Omid, M. (2010). Prediction of banana quality during ripening stage using capacitance sensing system. Australian Journal of Crop Science, 4(6), 443-447.
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Thongbai, P. (2013). Electrical polarization and dielectric response. Thai Journal of Physics, 30(1-2), 17-23. (in Thai)
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Bhosale, A. A. (2017). Detection of sugar content in citrus fruits by capacitance method. Procedia Engineering. 181. 466-471.
Bhosale, A. A., & Sundaram, K. K. (2015). Nondestructive method for ripening prediction of papaya. Procedia Technology. 19. 623-630.
Chaiwarakorn, S., Rojanasuwan, S., & Dorlohseng, Y. (2016). Measurement of concentrated natural latex by parallel plate capacitor technique. YRU Journal of Science and Technology, 1(2), 43-52. (in Thai)
COMSOL Incorporated. (2017). COMSOL Multiphysics 5.3. USA. 6045cb9a9d21.
Griffiths, D. J. (1999). Introduction to Electrodynamics. (3rd ed). New Jersey. Prentice-Hall International, Inc.
Khaled, D. E., Novas, N., Gazquez, J. A., Garcia, R. M., & Manzano-Agugliaro, F. (2015). Fruit and vegetable quality assessment via dielectric sensing. Sensors, 15, 15363-15397.
Naderi-Boldaji, M., Fazeliyan-Dehkordi, M., Mireei, S.A., & Ghasemi-Varnamkhasti, M. (2015). Dielectric power spectroscopy as a potential technique for the non-destructive measurement of sugar concentration in sugarcane. Biosystems Engineering, 140, 1-10.
Nuan-On, A., Angkawisittpan, N., Photong, C., & Siritaratiwat, A. (2015). Detection of water adulteration in honey using coaxial capacitor sensor. SWU Engineering Journal, 10(2), 9-18. (in Thai)
Owen, B. B., Miller, R. C., Milner, C. E., & Cogan, H. L. (1961). The dielectric constant of water as a function of temperature and pressure. The Journal of Physical Chemistry, 65(11), 2065-2070.
Oh, P. S., & Oh, S. J. (2011). What teachers of science need to know about models: An overview. International Journal of Science Education, 33(8), 1109-1130.
Osborne, J. (2014). Teaching scientific practices: Meeting the challenge of change. Journal of Science Teacher Education, 25(2), 177-196.
Praisri, A., Faikhamta, C., Tanak, A., Pongsophon, P., & Jantarakantee, E. (2022). Modeling practice and use in science classroom. Journal of Education Naresuan University, 24(1), 349-358. (in Thai)
Soltani, M., Alimardani, R., & Omid, M. (2010). Prediction of banana quality during ripening stage using capacitance sensing system. Australian Journal of Crop Science, 4(6), 443-447.
Soltani, M., Alimardani, R., & Omid, M. (2011). Design and development of a portable banana ripeness inspection system. The Journal of American Science, 7(6), 401-405.
Thongbai, P. (2013). Electrical polarization and dielectric response. Thai Journal of Physics, 30(1-2), 17-23. (in Thai)
Windschitl, M., & Thompson, J. (2006). Transcending simple forms of school science investigation: The impact of preservice instruction on teachers’ understandings of model-based inquiry. American Educational Research Journal, 43(4), 783-835.
Yadav, V. S., Sahu, D. K., Singh, Y., & Dhubkarya, D. C. (2010). The Effect of Frequency and Temperature on Dielectric Properties of Pure Poly Vinylidene Fluoride (PVDF) Thin Films. In Proceeding of the International MultiConference of Engineers and Computer Scientists. (pp 45-53).
Zeng, S., Trontz, A., Zhu, W., Xiao, H., & Dong, J. (2017). A Metal-Ceramic Coaxial Cable Fabry-Pérot Microwave Interferometer for Monitoring Fluid Dielectric Constant. Sensors and Actuators A: Physical, 257, 1-7.
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Published
2023-01-04
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