High-purity sulfur hexafluoride (SF6) is widely used in high- and medium-voltage power equipment. With technological advancements, its applications are expanding, and it is increasingly used in basic and scientific fields.
In high-temperature electric arcs, high-purity SF6 undergoes decomposition and ionization, resulting in energy consumption and significantly impacting the heat conduction process. Therefore, its thermal conductivity can be considered to consist of two parts: standard thermal conductivity and the weight related to the decomposition and ionization reactions.
However, for gaseous media, the heat transfer capacity of high-purity SF6 is often not simply conductive but largely depends on convective heat transfer. Convective heat transfer occurs due to the presence of partial pressure differences, causing macroscopic movement of the gas medium and dissipating heat. The convective heat transfer capacity of a gaseous medium is related to factors such as the gas’s specific heat capacity and viscosity.
Secondly, the diameter of SF6 molecules is larger than that of oxygen and nitrogen molecules in the air, greatly shortening the uniform free path of free electrons in the SF6 gas. This makes it difficult for free electrons to accumulate energy in an electric field, thus reducing their collisional ionization ability.
Post time: Oct-29-2025