Effect of scan time on SMPS particle size measurements
الكلمات المفتاحية:
particle size distribution، ; particle numberالملخص
This work investigated the effect of scan time of SMPS (Scanning Mobility Particle Sizer) on the stability and shift of ultra-fine and nano-particles measurement. The particles produced from distilled water and salt water (0.020%wt) by an aerosol generator were measured for number concentrations and size distributions using a SMPS. The scanning time of the SMPS was set at 30s, 60s, 120s, 180s and 240s. The filtered compressed air was used to blow through the generator to produce particles. The effect of scanning time on particle numbers and size distributions was compared for each condition. A unimodal size distribution of the particles was found in all the examined conditions. The results showed that a shift of particle size distribution towards smaller particles and lower particle number concentrations with shorter scanning times such as 30s and 60s occurred; indicating that the scanning time affects the particle number and size distribution measurements. The SMPS scanning time should choose to be more than 100s to get reasonably reliable results
المراجع
Allouis, C., F. Beretta, et al. "Measurements of ultrafine particles from a gas-turbine burning biofuels." Experimental Thermal and Fluid Science 34(3): 258-261.
Asbach, C., H. Kaminski, et al. (2009). "Comparison of four mobility particle sizers with different time resolution for stationary exposure measurements." Journal of Nanoparticle Research 11(7): 1593-1609.
Asbach, C., H. Kaminski, et al. (2009). "Comparison of four mobility particle sizers with different time resolution for stationary exposure measurements." J Nanopart Res 11: 1593-1609.
Harrison, R. M., J. P. Shi, et al. (2000). "Measurement of number, mass and size distribution of particles in the atmosphere." Phil. Trans. R. Soc. Lond. A 358: 2567-2580.
Lighty, J. S., J. M. Veranth, et al. (2000). "Combustion Aerosols: Factors Governing Their Size and Composition and Implications to Human Health." Air & Waste Management Association 50(1047-3289): 1565-1618.
Shi, J. P., A. A. Khan, et al. (1999). "Measurements of ultrafine particle concentration and size distribution in the urban atmosphere." The Science of The Total Environment 235(1-3): 51-64.
Shi, J. P., D. Mark, et al. (2000). "Characterization of Particles from a Current Technology Heavy-Duty Diesel Engine." Environ. Sci. Technol 34: 748-755.
Tan, P., Z. Hu, et al. (2009). "Particle Number and Size Distribution from a Diesel Engine with Jatropha Biodiesel Fuel." SAE 2009-01-2726.
Technik, G. A. (2003). "Atomizer Aerosol Generator 7.8-320, Instruction Manual " 83404-Ainring, Dorfstrasse 9, Germany.
Tokonami, S. and E. O. Knutson (2000). "The Scan Time Effect on the Particle Size Distribution Measurement in the Scanning Mobility Particle Sizer System." Aerosol Science and Technology 32(3): 249 - 252.
TSI (2003). "Model 3936 SMPS (Scanning Mobility Particle Sizer), Instruction Manual " P/N 1933796, Revision H.
