Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 20, No. 1 (February 2007) 45-54   

downloaded Downloaded: 82   viewed Viewed: 1819

  THREE-DIMENSIONAL SIMULATION OF AIRFLOW AND NANO-PARTICLE BEAM FOCUSING IN AERODYNAMIC LENSES(RESEARCH NOTE)
 
Omid. Abouali*

Department of Mechanical Engineering, Shiraz University
Shiraz, Iran
abouali@shirazu.ac.ir

Goodarz. Ahmadi

Department of Mechanical and Aeronautical Engineering, Clarkson University
Potsdam, NY, 13699-5725
ahmadi@clarkson.edu


*Corresponding Author

 
( Received: March 01, 2005 – Accepted in Revised Form: January 18, 2007 )
 
 

Abstract    In this paper airflow, nano-and micro-particle motions in an aerodynamic particle beam focusing system consisting of several lenses, a nozzle and the downstream chamber, was studied. A three-dimensional numerical simulation for the system was presented and the compressible airflow and thermal conditions in the aerodynamic lens system were evaluated. Dilute particle concentration was assumed so that the particle motion does not affect the flow field and a one-way coupling is assumed. In the computational model, an intermediate chamber with different size skimmers downstream of the nozzle was also considered. The simulation results for 3-dimensional flow field showed that the assumption of axi-symmetric flow is reasonable at the downstream of the nozzle. The performance of the lens with air as carrier gas for focusing nano-and micro-particles was discussed. The results showed that the sub 30 nm particle trajectories are three-dimensional and the assumption of the axi-symmetric particle motions is not valid.

 

Keywords    Aerodynamic, Lenses, Nano, Micro, Particles

 

References   

1. Jayne, J. T., Leard, D. L., Zhang, X., Davidovits, P., Smith, K. A., Kolb, C. E. and Worsnop, D. R., “Development of an Aerosol Mass Spectrometer for Size and Composition Analysis of Submicron Particles”, Aerosol Science and Technology, Vol. 33, (2000), 49-70.

2. Zhang, X., Smith, K. A., Worsnop, D. R., Jimenez, J., Jayne, J. T. and Kolb, C. E., “A Numerical Characterization of Particle Beam Collimation by an Aerodynamic Lens-Nozzle System: Part I. An Individual Lens or Nozzle”, Aerosol Science and Technology, Vol. 36, (2002), 617-631.

3. Kane, D. B. and Johnston, M. V., “Size and Composition Biases on the Detection of Individual Ultrafine Particles by Aerosol Mass Spectrometry”, Environmental Science Technology, Vol. 34, (2000), 4887-4893.

4. Kane, D. B., Oktem, B. and Johnston, M. V., “Nanoparticle Detection by Aerosol Mass Spectrometry”, Aerosol Science and Technology, Vol. 34, (2001), 520-527.

5. Murphy, W. K. and Sears, G. W., “Production of Particles Beams”, Journal of Applied Physics, Vol. 85, (1964), 1986-1987.

6. Dahneke, B. E. and Cheng, Y. S., “Properties of Continuum Source Particle Beam. I. Calculation Method and Results”, Journal of Aerosol Science, Vol. 10, (1979), 257-274.

7. Dahneke, B. E. and Cheng, Y. S., “Properties of Continuum Source Particle Beam. II. Beam Generated in Capillary Expansion”, Journal of Aerosol Science, Vol. 10, (1979), 257-274.

8. Estes, T. J., Vilker, V. L. and Friendlander, S. K., “Characteristics of a Capillary Generated Particle Beam”, Journal of Colloid Interface Science, Vol. 93, (1983), 84-94.

9. Fernandez de la Mora, J. and Riesco-Chueca, P., “Aerodynamic Focusing of Particles in a Carrier Gas”, Journal of Fluid Mechanics, Vol. 195, (1988), 1-21.

10. Israel, G. W. and Freidlander, S. K., “High Speed Beams of Small Particles”, Journal of Colloid Interface Science, Vol. 24, 330-337.

11. Mallina, R. V., Wexler, A. S. and Johnson, M. V., “High Speed Particle Beam Generation: Simple Focusing Mechanisms”, Journal Aerosol Science., Vol. 30, (1999), 719-738.

12. Middha, P. and Wexler, A. S., “Particle Focusing Characteristics of Sonic Jet”, Aerosol Science Technology, Vol. 37, (2003), 907-915.

13. Rao, N. P., Navascues, J. and Fernandez de la Mora, J., “Aerodynamic Focusing of the Particles in Viscous Jets”, Journal of Aerosol Science, Vol. 24, 879-892.

14. Kievit, O., Weiss, M., Verheijet, P. J. T., Marijnissen, J. C. M. and Scarlett, B., “The On-Line Chemical Analysis of Single Particles Using Aerosol Beams and Time of Flight Mass Spectrometer”, Chemical Engineering Communication, Vol. 151, (1996), 79-100.

15. Liu, P., Ziemann, P. L., Kitt elson, D. B. and McMurry, P. H., “Generating Particle Beams of Controlled Dimensions and Divergence: I. Theory of Particle Motion in Aerodynamic Lenses and Nozzle Expansions”, Aerosol Science Technology, Vol. 22, (1995), 293-313.

16. Liu, P., Ziemann, P. L., Kitt elson, D. B. and McMurry, P. H., “Generating Particle Beams of Controlled Dimensions and Divergence: II. Experimental Evaluation of Particle Motion in Aerodynamic Lenses and Nozzle Expansions”, Aerosol Science and Technology, Vol. 22, (1995), 314-324.

17. Abouali, O. and Ahmadi, G., “Numerical Simulation of Supersonic Flow and Particle Motion in Aerodynamic Lenses”, ASME Fluid Engineering Summer Conference, Honolulu, Hawaii, (July, 2003), 7-11.

18. Zhang, X., Smith, K. A., Worsnop, D. R., Jimenez, J., Jayne, J. T., Kolb, C. E., Morris, J. and Davidovits, P., “Numerical Characterization of Particle Beam Collimation: Part II Integrated Aerodynamic Lens-Nozzle System”, Aerosol Science Technology, Vol. 38, (2004), 619-638.

19. Wang, X., Gidwani, A., Girshick, S. L. and McMurry, P. H., “Aerodynamic Focusing of Nanoparticles: II. Numerical Simulation of Particle Motion Through Aerodynamic Lenses”, Aerosol Science Technology, Vol. 39, (2005), 624-636.

20. Hinds, W. C., “Aerosol Technology, John Wiley and Sons”, Inc., Second Edition, (1999).

21. Abouali, O. and Ahmadi, G., “A model for Supersonic and Hypersonic Impactors for Nano - particles”, Journal of Nano-particles, Vol. 7, No. 1, (2005), 75-88.

22. Hering, S. V., Friedlander, S. K., Collins, J. J. and Richards, L. W., “Design and Evaluation of a New Low-Pressure Impactor, Part 2. Environmental”, Science and Technology, Vol. 13, (1979), 184-188.

23. Li, A. and Ahmadi, G., “Deposition of Aerosols on Surfaces in a Turbulent Channel Flow”, International Journal of Engineering Science, Vol. 31, (1993), 435-445,

24. FLUENT Users’ Manual, “Discrete Phase Modeling”, (1998).





International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir