The paper concerns with a high performance cooling method for a HVDC converter using fatty acid ester‐based phase change dispersion (PCD) in a heat sink with double‐layer oblique‐crossed ribs. Thermo‐physical properties of PCDs were first characterized under both solid and liquid states, and the cooling performance of the heat exchanger was then experimentally examined, by heating two copper blocks clamped closely to the aluminium heating surfaces. A three‐dimensional Euler‐Euler multiphase approach was further performed to evaluate the thermal performance under different operating conditions including heating power, flowrate and PCD concentration. The results showed that the viscosity of PCD can be a 100 times that of water, but the increased pumping power was only ~17.01% on average. The use of the PCD achieved a lower temperature of heat sink and fluid than that of water under the same set of conditions due to the latent heat of the PCM, thus enabling a safer and cooler environment for temperature‐sensitive HVDC components such as insulated gate bipolar transistors (IGBT). An optimal set of working conditions was proposed and a flowrate of 8 L/min under a heating power of 1.1 kW and a PCM concentration of 25% was recommended for industrial cooling operations.

中文翻译：

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在带有双层斜交肋的散热器中使用基于脂肪酸酯的相变分散体对HVDC转换器进行高性能冷却

本文关注的是高压HVDC转换器的高效冷却方法，该方法在带有双层斜交肋的散热器中使用基于脂肪酸酯的相变分散体（PCD）。首先在固态和液态下都对PCD的热物理性质进行了表征，然后通过加热两个紧紧夹在铝加热表面上的铜块，通过实验检查了热交换器的冷却性能。进一步使用三维Euler-Euler多相方法评估了在不同运行条件下的热性能，包括加热功率，流量和PCD浓度。结果表明，PCD的粘度可以是水的100倍，但增加的泵送功率平均仅为〜17.01％。在同一组条件下，由于PCM的潜热，使用PCD可以使散热器和流体的温度低于水的温度，从而为温度敏感的HVDC组件（如绝缘闸）提供了更安全，更凉爽的环境双极晶体管（IGBT）。提出了一套最佳的工作条件，建议在工业冷却操作中，在1.1 kW的加热功率和PCM浓度为25％的情况下，流量为8 L / min。