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明确蒸发冷凝技术产生准单分散气溶胶的发生效果及其与数值模拟的吻合程度,可以应用于高效(high efficiency particulate air,HEPA)滤料计数效率的测量,使其兼具测量速度快和可测效率范围宽的优点。通过Euler-Lagrange模型数值模拟计算和扫描电迁移率粒度分析仪(scanning mobility particle sizers,SMPS)实验测量,研究了不同参数条件下,蒸发冷凝装置产生气溶胶的粒径分布状况。研究结果表明:模拟结果与实验数据吻合程度较高;Euler-Lagrange模型适用于模拟冷凝管中气溶胶的生长规律;通过调节发生器的参数可产生不同粒径的高浓度准单分散气溶胶。气溶胶粒径分布不仅完全满足HEPA滤料效率检测要求,而且可以应用于超高效(ultra low penetration air,ULPA)滤料效率检测。
To clarify the effect of pseudo-monodisperse aerosol generated by evaporative condensation technology and its coincidence with numerical simulation can be used to measure the counting efficiency of high efficiency particulate air (HEPA) filter, The efficiency of a wide range of advantages. Through the Euler-Lagrange numerical simulation and scanning mobility particle sizers (SMPS) experimental measurements, the particle size distribution of the aerosol generated by the evaporative condensation unit under different parameters was studied. The results show that the simulation results are in good agreement with the experimental data. The Euler-Lagrange model is suitable for simulating the growth of aerosols in a condenser tube. The high concentration of monodisperse aerosols of different particle sizes can be produced by adjusting the generator parameters. Aerosol particle size distribution not only fully meets the HEPA filter efficiency test requirements, but also can be applied to ultra low penetration air (ULPA) filter efficiency test.