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首页> 外文期刊>International Journal of Heat Exchangers >Electrode Design for EHD Enhancement of Boiling and Condensation in Shell and Tube Heat Exchangers
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Electrode Design for EHD Enhancement of Boiling and Condensation in Shell and Tube Heat Exchangers

机译：EHD增强壳管式换热器沸腾和冷凝的电极设计

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Theoretical and experimental work to optimise the electrode shape for electrohydrody-namic (EHD) enhancement of boiling and condensation heat transfer in multi-tube shell and tube heat exchangers is described in this paper. In the case of boiling, a numerical technique was used to calculate the electric field distribution and the resultant of the surface tension, gravity and electric forces on bubbles located on the heating tubes. A simple to manufacture and install 4-rod semi-symmetrical electrode, i.e. with the upper two rods placed closer to the tube surface than the lower ones, is proposed for horizontal shell and tube evaporators. Three different methods were used to evaluate the electric field effects on condensation namely: evaluation of the EHD force components, an energetic method and the capacitance method. A 4-rod electrode is also proposed for horizontal condensers, in this case with the upper rods placed further away from the tube than the two bottom ones. The performance of both the optimised EHD evaporator and condenser was examined using R123.
机译：本文介绍了在多管壳管式换热器中优化电极形状以提高电水动力学（EHD）沸腾和冷凝传热的电极形状的理论和实验工作。在沸腾的情况下，使用数值技术来计算电场分布以及位于加热管上的气泡上的表面张力，重力和电场力的结果。对于水平壳管式蒸发器，提出了一种易于制造和安装的4杆半对称电极，即，上部的两个杆比下部的杆更靠近管表面。三种不同的方法用于评估电场对凝结的影响，即：EHD力分量的评估，能量法和电容法。还提出了一种用于水平冷凝器的4杆电极，在这种情况下，上部杆的位置比底部的两个杆更远离管道。使用R123检查了优化的EHD蒸发器和冷凝器的性能。

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