摘要
差分迁移率谱因其结构简单、功耗小、可连续检测、响应速度快,被广泛地应用于纳米颗粒物的分析测量领域.为了研究不同流场和结构参数对其性能的影响,利用COMSOL Muhiphysics软件对平板型DMA中颗粒物传输过程进行了仿真,研究了鞘气流量Qs、分离区长度L以及检测电极狭缝宽度f对检测谱图的分辨率和灵敏度的影响.结果 表明Qs在大于3L/rain后,继续增加Qs对分辨率和灵敏度的提升作用变弱,而当检测电极狭缝宽度f超过4mm后,谱图的半峰宽会迅速增大;分离区长度L在7mm左右时,谱图的分辨率较高;此外,Qs和L的取值会影响到峰值电压,进而影响待测颗粒物的迁移率范围.仿真结果为平板型DMA的结构优化和工作参数选择提供了参考.
Differential mobility analyzer(DMA) is widely used in the field of analysis and measurement of nano-particles for the advantages of simple structure,small power consumption,continuous detection,fast response and so on.In the paper,the COMSOL Multiphysics software was used to simulate the transmission of nano-particles in Planner DMA and study the effect of flow field and structure parameters on the resolution and sensitivity of the detection spectrum.The results show that the enhancement of resolution and sensitivity is weakened when sheath gas flow rate Qs is higher than 3 L/min;the Full width at half height(FWHH) of the spectrogram increases rapidly when the slit width of the detection electrode f exceeds 4 mm,and the resolution of the spectrum is better when the separation area length L is around 7 mm.In addition,Qs and L also affect the peak voltage,which in turn affects the range of mobility of the particles to be measured.The simulation results provide some reference for structural optimization and selection of operating parameters of planar DMA.
作者
石海峡
余健文
刘友江
陈池来
SHI Hai-xia;YU Jian-wen;LIU You-jiang;CHEN Chi-lai(Hefei University of Technology,School of Mechanical Engineering,Hefei 230009,China;Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China)
出处
《计算机仿真》
北大核心
2019年第5期412-416,共5页
Computer Simulation
基金
国家重点研发计划(2016YFC0201101)
国家自然科学基金(61374016)
安徽省自然科学基金项目(1708085QF129)
