This page has only limited features, please log in for full access.
The supersaturated condensation of atmospheric aerosol is important in the study of mechanisms of cloud condensation and even heavy air pollution. The existing technology cannot realize accurate dynamic control of wide range supersaturation, so it is difficult to study condensation growth characteristics of nanoparticles through different levels of supersaturation. Here, a supersaturated condensation growth measurement system with three-stage microscope pipes was developed. The resolution of supersaturated condensation system is 0.14, within the range of 0.92 to 2.33 after calibration. Stabilization time is only about 80 s for saturation range 0.92–1.01, which helps to control saturation rapidly, and the control deviation of saturation is no more than 0.06. Measurement of different supersaturated condensation growth control conditions showed that, the particle size increased significantly compared with hygroscopic growth at high humidity. For single-component particles, the increase in size increased to a similar size at the same saturation, with a difference within 7.4%. The increase in size for ammonium sulfate (AS) increased by 13.4–30.2% relative to that of glucose. For the mixed-component, the increase in size decreased about 15.9–25.0% with the increase of the glucose. Because the glucose coating on the surface of AS have hindered particle growth. This also shows that atmospheric ultrafine particles, especially inorganic salt particles, will rapidly grow into larger particles under supersaturated conditions such as increased environmental humidity, thus having some impact on environmental pollution and climate change.
Jiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere 2021, 12, 558 .
AMA StyleJiejie Bian, Huaqiao Gui, Xiuli Wei, Tongzhu Yu, Zhibo Xie, Jie Wang, Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere. 2021; 12 (5):558.
Chicago/Turabian StyleJiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. 2021. "Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System." Atmosphere 12, no. 5: 558.
In order to realize accurate dynamic control of supersaturation and to study condensation growth characteristics of nanoparticles through different levels of supersaturation, a series of parametric analyses and systematic comparisons between two-stage and three-stage operating temperature designs were simulated with COMSOL Multiphysics. The simulation results showed that the three-stage operating temperature did not change peak supersaturation compared with two operating temperatures, and the three-stage operating temperature was superior in decreasing the amount of water vapor and the temperature, thus lowering particle loss and variation in detection and collection. The peak supersaturation level increased by 0.3 as the flow rate increased from 0.6 to 2.0 L/min, but the supersaturation peak moved from 0.0027 z0 to 0.08 z0 (i.e., the growth time and the final size decreased by 40%). Peak supersaturation increased as the temperature difference increased or the temperature difference window was shifting left, and minimum activation size decreased. Shifting the 70 °C temperature difference window from 9 °C, 79 °C–1 °C, 71 °C for the condenser and initiator temperatures resulted in peak supersaturation in the centerline being above 5.8, and the activation size changed as low as 1 nm. Experiments with flow rates varying by a factor of 2.5 (from 0.6 to 1.5 L/min) resulted in a final size decrease of 43% (from 3.2 to 1.8 μm), and experimental results of outlet particle size distributions were equivalent with theoretical analysis as the operating temperature was changed.
Jiejie Bian; Huaqiao Gui; Zhibo Xie; Tongzhu Yu; Xiuli Wei; Wenyu Wang; Jianguo Liu. Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube. Journal of Environmental Sciences 2019, 90, 275 -285.
AMA StyleJiejie Bian, Huaqiao Gui, Zhibo Xie, Tongzhu Yu, Xiuli Wei, Wenyu Wang, Jianguo Liu. Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube. Journal of Environmental Sciences. 2019; 90 ():275-285.
Chicago/Turabian StyleJiejie Bian; Huaqiao Gui; Zhibo Xie; Tongzhu Yu; Xiuli Wei; Wenyu Wang; Jianguo Liu. 2019. "Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube." Journal of Environmental Sciences 90, no. : 275-285.