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The Field-Trap Effect under Conditions of Boiling of Dielectric Liquids in Nonuniform Electric Fields

机译:非均匀电场中电介质沸腾条件下的场俘效应

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摘要

The mechanism of field-trap effect under conditions of boiling of dielectric liquids in a nonuni-form electric field is discussed, which was experimentally observed in [1, 2]. According to the data of [1, 2], an external electric field initiates the process of boiling up of liquid, with the growth of vapor bubbles to the departure size occurs mainly in regions with low values of electric field (in field traps). This phenomenon is attributed to the effect made on the vapor bubbles by electric forces directed in opposition to the field square gradient. In view of this, the bubbles arising in the region of strong field move to the region of weak field where they grow to the departure size to provide for an increase in local heat transfer. Such a mechanism is observed in the cited experiments [1, 2] in the boiling of liquid nitrogen at a flat conducting surface with single projections leading to a local nonuniformity of electric field on a heated surface.
机译:讨论了在非均匀电场中电介质液体沸腾条件下的场俘获机理,在[1,2]中进行了实验观察。根据[1,2]的数据,外部电场引发了液体的沸腾过程,其中蒸汽气泡的增长到偏离尺寸主要发生在电场值较低的区域(在场阱中)。这种现象归因于与电场平方梯度相反的电场力对蒸气气泡的影响。鉴于此,在强磁场区域中产生的气泡移动到弱磁场区域,在该区域中气泡逐渐增大到离开的大小,以增加局部传热。在引用的实验[1、2]中,液氮在具有单个凸起的平坦导电表面上沸腾,导致加热表面上的电场局部不均匀,观察到了这种机理。

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