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Thermal stimulus method applied to insulating liquids: Numerical analysis and discussion of the thermal convection effects
Journal of Electrostatics ( IF 1.8 ) Pub Date : 2021-05-09 , DOI: 10.1016/j.elstat.2021.103593
Xavier Sidambarompoulé , Petru Notingher , Jean-Charles Laurentie , Thierry Paillat , Paul Leblanc

Non-destructive thermal techniques have been developed and extensively used during the last decades for space charge measurements in solid dielectrics. These methods are based on measuring and analyzing a transient capacitive current or voltage due to the redistribution of influence charges when a heat flow induced by an external thermal stimulus diffuses through the sample. If this principle is à priori useable on liquids, its application to such materials and appropriate interpretation of the measured signals require assessing and identifying the effects of thermal convection, which is likely to appear when heat diffuses in a liquid medium. This issue is addressed in the present work. Transient current responses of dielectric liquids with two different viscosities containing interface charges are computed numerically in the absence and in the presence of thermal convection when thermal stimuli of amplitudes up to 20 K are applied. The effects of the thermal convection are analyzed and guidelines for reducing them are proposed.



中文翻译:

热刺激法在绝缘液体中的应用:热对流效应的数值分析与讨论

在过去的几十年中,无损热技术已经被开发并广泛用于固体电介质中的空间电荷测量。这些方法基于对由外部热刺激引起的热流扩散通过样品时影响电荷的重新分布所造成的瞬态电容性电流或电压进行测量和分析。如果这个原则是先验的由于可以在液体上使用,因此将其应用于此类材料并适当解释测量的信号需要评估和识别热对流的影响,当热量在液体介质中扩散时很可能会出现这种情况。本工作将解决此问题。当施加振幅高达20 K的热刺激时,在不存在和存在热对流的情况下,通过数值计算具有两种不同粘度的包含界面电荷的介电液体的瞬态电流响应。分析了热对流的影响,并提出了减少热对流的指南。

更新日期:2021-05-09
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