Data from: The Electric Honeycomb; an investigation of the Rose window instability

The Rose-window instability is a little-explored electrohydrodynamic instability that manifests when a layer of low-conducting oil is placed in an electric field generated by corona discharge in a point-toplane configuration. Above a critical voltage, the instability starts as a single dimple in the oil layer right below the point electrode and subsequently evolves into a characteristic pattern of polygonal cells. In this study we experimentally explore governing parameters that guide the instability and document geometric attributes of the characteristic cellular pattern. The driving force for the instability has been attributed to the buildup of charged ions which in-turn apply an electric pressure on the oil surface. We confirm the charged surface distribution using thermal imaging and demonstrate that the instability can be locally inhibited by preventing charge buildup under an ion shadow.

玫瑰窗不稳定性（Rose-window instability）是一种尚少得到研究的电流体动力学不稳定性。当低电导油层被置于点-平面构型电晕放电产生的电场中时，该不稳定性便会显现。当电压超过临界值时，该不稳定性首先会在点电极正下方的油层中形成单个凹陷，随后演变为具有特征性的多边形胞状结构图案。本研究通过实验探究了调控该不稳定性的关键参数，并记录了该特征性胞状结构的几何属性。该不稳定性的驱动力被归因于带电离子的累积，这些离子会转而对油层表面施加电场压力。本研究通过热成像技术验证了带电表面分布情况，并证实通过抑制离子阴影区域下的电荷累积，可对该不稳定性实现局部抑制。