印刷电路板式换热器Zigzag通道流动与传热数值模拟

摘要

Printed Circuit Heat Exchanger(PCHE) is a competitive candidate in clean energy areas such as nuclear power plant,solar power station and LNG station due to the advantage of high efficiency,compact structure,high temperature and high pressure resistance. In this paper,the thermal—hydraulic performance of a Zigzag PCHE is studied by establishing 3-D heat transfer model,and the model is validated by comparing with experiment results.The influence of channel angle(θ) on velocity and temperature distribution is investigated.(Nu/Nu0)/(f/f0) is proposed to valuate overall performance of PCHE,and channel angle and flow condition are optimized synergistically.It is found that,at θ=15°、25°,the overall performance of PCHE is excellent when Re≥250,and θ=15°is the best angel of bend. The overall performance of PCHE at θ=30°、45° is unsatisfactory, especially at θ=45°.The result can provide significant reference to optimal design of PCHE.%印刷电路板式换热器以其高效、紧凑、耐高温、耐高压等特点,在核能、太阳能、液化天然气等清洁能源领域具有广阔的发展潜力.本文通过建立三维传热数值模型,研究了印刷电路板式换热器Zigzag通道内部冷、热流体的流动与传热基本规律,并与试验结果进行对比,验证了模型的准确性;分析了Zigzag通道角度对流体流速、温度分布的影响规律,并以(Nu/Nu0)/(f/f0)作为评价指标,对通道角度与流动条件进行耦合优化.研究表明:当Re≥250时,15°、25°的Zigzag通道综合性能优越,且15°的Zigzag通道性能最佳;而30°、45°的Zigzag通道综合性能不理想,尤其是45°的Zigzag通道,其综合性能始终低于直通道.研究结果可为印刷电路板式换热器的热力设计提供重要参考.