Institute for Energy Problems in Chemical Physics RAS (branch), Ac. Semenov prospekt 1/10 Chernogolovka, Moscow region, 142432, Russia.
J Am Soc Mass Spectrom. 2017 Oct;28(10):2132-2142. doi: 10.1007/s13361-017-1743-7. Epub 2017 Jul 18.
Numerical simulations of a gas flow through a capillary being a part of mass spectrometer atmospheric interface were performed using a detailed laminar flow model. The simulated interface consisted of atmospheric and forevacuum volumes connected via a thin capillary. The pressure in the forevacuum volume where the gas was expanding after passing through the capillary was varied in the wide range from 10 to 900 mbar in order to study the volume flow rate as well as the other flow parameters as functions of the pressure drop between the atmospheric and forevacuum volumes. The capillary wall temperature was varied in the range from 24 to 150 °C. Numerical integration of the complete system of Navier-Stokes equations for a viscous compressible gas taking into account the heat transfer was performed using the standard gas dynamic simulation software package ANSYS CFX. The simulation results were compared with experimental measurements of gas flow parameters both performed using our experimental setup and taken from the literature. The simulated volume flow rates through the capillary differed no more than by 10% from the measured ones over the entire pressure and temperatures ranges. A conclusion was drawn that the detailed digital laminar model is able to quantitatively describe the measured gas flow rates through the capillaries under conditions considered. Graphical Abstract ᅟ.
使用详细的层流流动模型对作为质谱仪大气接口一部分的通过毛细管的气体流动进行了数值模拟。模拟接口由通过薄毛细管连接的大气和前真空体积组成。通过改变前真空体积中的压力（气体在通过毛细管后在前真空体积中膨胀），压力范围从 10 到 900 毫巴，以便研究体积流量以及其他流动参数作为大气和前真空体积之间压降的函数。毛细管壁温度在 24 到 150°C 的范围内变化。使用标准气体动力学模拟软件包 ANSYS CFX 对粘性可压缩气体的完整纳维-斯托克斯方程进行数值积分，同时考虑了传热。将模拟结果与使用我们的实验装置进行的气体流动参数的实验测量值进行了比较，并从文献中获取了这些测量值。在整个压力和温度范围内，通过毛细管的模拟体积流量与测量值的差异不超过 10%。得出的结论是，在所考虑的条件下，详细的数字层流模型能够定量描述通过毛细管的测量气体流量。
