Molecular Dynamics Simulations of the Conductivity of Aqueous NaCl in the Presence of Sucrose and Electric Fields

Abstract:

Various natural contamination components distributed on the surface of high-voltage insulators play important roles on the flashover hazard. Under the low humidity condition, the flashover voltage could be affected considerably by the sucrose contaminations. Molecular dynamics simulations have been carried out in order to reveal the microscopic mechanisms for the sucrose-involved flashover uptake. It is found that the diffusion of ions decreases significantly and thus the conductivity of aqueous medium is lowered apparently. In the presence of sucrose, the contact ion pairs formed between Na⁺ and Cl^- ions are enhanced because both ions are less coordinated to water molecules. The influence of the external electric fields on the diffusion and conductivity were investigated as well. It is suggested that the sucrose contamination might lead to the uneven electric fields on the insulator surface.

• Periodical: Advanced Materials Research (Volume 937)
• Pages: 200-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.937.200
• Online since: May 2014
• Authors: Xiao Gang Li, Shu Ai Yang, Ming Jun Tang, Jing Lei, Hui Hu*, Hua Hou, Bao Shan Wang
• Keywords: Flashover, Insulator, Molecular Dynamic (MD), NaCl, Sucrose

References

[1] N. G. Ramos, R. M. T. Campillo, K. Naito: IEEE Transactions on Power Delivery, Vol. 8 (1993), pp.1842-1850.

[2] Z. Su: Annual Conference Proceedings of High Voltage Special Committee of Chinese Society for Electrical Engineering (2007), pp.281-290.

[3] H. Li, G. Liu, L. Li: Proceedings of the CSEE, Vol. 31 (2011), pp.128-137.

[4] H. Sun: J. Phys. Chem. B Vol. 102 (1998), p.7338.

[5] H. Uchida, M. Matsuoka: Fluid Phase Equilibria, Vol. 219 (2004), pp.49-54.

[6] J. Timko, D. Bucher, S. Kuyucak: J. Chem. Phys. Vol. 132 (2010), p.114510.

[7] S. Bouazizi, S. Nasr, N. Jaidane, M. Bellissent-Funel: J. Phys. Chem. B, Vol. 110 (2006), pp.23515-23523.

DOI: 10.1021/jp0641583

[8] A. P. Lyubartsev, A. Laaksonen: J. Phys. Chem. Vol. 100 (1996), pp.16410-16418.

[9] S. B. Engelsen, C. H. Penhoat, S. Perez: J. Phys. Chem. Vol. 99 (1995), pp.13334-13351.

[10] H. Hu, H. Hou, B. Wang: J. Phys. Chem. C, Vol. 116(2012), pp.19773-19780.

[11] J. A. Dean, in: Lange's Handbook of Chemistry; edited by McGraw-Hill Publishing, NY (1985).