Loading...
| Friend's email | |
| Your name | |
| Your email | |
| enter code | |
This page was sent successfuly
- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 42204 (58)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Saeedi, Mohammad Saeed; Sani, Mahdi
- Abstract:
- In this study different models of an aerodynamic particle sizer and aerodynamic focusing lens were introduced and governing equations for an aerodynamic focusing lens for flow fields and particle motions were discussed. An aerodynamic focusing lens was simulated for analyzing particle motions and flow fields. Two kinds of models are considered; One was Ahmadi`s model and the other one was Wang`s model and both models are axisymmetric. The results show that for small particles (sub 30 nanometers), Brownian motions were highly effective on transmission efficiency and producing particle beams. The two models are compared and the results show that Ahmadi`s model produce narrower particle beams for particles larger than 100 nanometers and it is not good for focusing smaller particles. Wang`s model was offered for the Nano particles (smaller than 100 nanometers), it was illustrated that transmission efficiency for these sizes of particles increases and particle beams are narrower and thinner. The effect of the inlet orifice and relaxation chamber on the performance of the aerodynamic focusing system was also investigated. It was shown that the losses for particles smaller than 10 nanometers occur at the inlet orifice walls. For 10 to 30 nanometer particles, the major losses occur at the inlet orifice walls. All the inlet orifice dimensions were new and one model was suggested for usage in an aerodynamic focusing lens because of higher transmission efficiency in comparison with the others.
- Keywords:
- Aerodynamic Focusing Lens ; Transmission Efficiencies ; Particle Loss ; Particle Beam
Digital Object List-
محتواي پايان نامه - view
Bookmark