Abstract High voltage electric fields can be used as an active heat transfer enhancement technique for convective boiling or condensing dielectric fluids, with the major component of this enhancement being attributed to phase redistribution and mixing in the system due to electric body forces. Many performance prediction tools for convective boiling and condensation rely on flow pattern maps to identify the flow regime for use with flow pattern specific heat transfer and pressure drop correlations [1] , [2] . In this paper, a mechanistic approach to developing two phase flow pattern maps for two-phase dielectric fluids subject to high voltage fields using a fully contained, equation-based electric Froude number approach is presented and compared against the experimental flow pattern data for EHD convective boiling & condensation available in the literature and from the current experimental study. Despite the development of newer diabatic, semi-mechanistic flow pattern models for free-field heat exchanger performance analysis, it is recommended that the Steiner equations for flow pattern transition be used as a basis for the mapping when additional physics such as EHD is coupled, as the empirical fits in newer semi-mechanistic maps are unreliable when additional physics is present.

中文翻译：

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一种为受高压极化的两相介电流体开发两相流型转变图的机械方法

摘要 高压电场可用作对流沸腾或冷凝介电流体的主动传热增强技术，这种增强的主要成分归因于系统中由于电体力引起的相重新分布和混合。许多用于对流沸腾和冷凝的性能预测工具依赖于流型图来确定流态，以用于流型特定的传热和压降相关性 [1]、[2]。在本文中，提出了一种使用完全包含的、基于方程的电 Froude 数方法来开发受高压场影响的两相介电流体的两相流型图的机械方法，并将其与 EHD 对流的实验流型数据进行比较。沸腾& 冷凝可在文献和当前的实验研究中获得。尽管开发了用于自由场换热器性能分析的新型非绝热半机械流型模型，但建议在耦合 EHD 等附加物理场时，将流型转变的 Steiner 方程用作映射的基础，因为当存在额外的物理时，新的半机械地图中的经验拟合是不可靠的。