Loading...

Theoretical and Experimental Studies of Interaction of Laser Beam with Particulate Microflows

Zabetian Targhi, Mohammad | 2013

769 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45042 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Saeedi, Mohammad Saeed; Shafii, Mohammad Behshad
  7. Abstract:
  8. Contactless and nonintrusive methods in particulate manipulation have been considered by many investigations. Particularly the use of these methods in characterization of micro and nano flows is in the focus of interests. Laser usage in the particulate systems has been dramatically increased during the last two decades. Laser can be used either as an illustration or excitation source in these systems. So-called optical tweezers use the laser beam for particle manipulation and characterization based on the hydrodynamic interaction of the laser beam with particles. There are numerous works being conducted in the field of particulate manipulation and characterization using laser beam.Present work considers theoretical and experimental investigation of the laser beam with particulate flows. In the theoretical section, ray optics model is implemented in the allowable size range to calculate the hydrodynamic interactions. In addition, an approximate model is proposed to clarify the conditions of pure hydrodynamic interactions. Based on the simulation results an optical manipulation mechanism is designed for detection and separation of microparticles suspended in liquid. The experimental studies are conducted in a way to achieve the excitation of the groups of particles. The main contribution of this work is development of a particle excitation mechanism for precise detection and separation of microparticles using a unique technique for fluid density controil. In addition the conditions of pure hydrodynamic interactions of laser beam and suspensions are presented.Considering the advantages of the laser excitation relative to other methods such as noninvasive and modularity of the set up, using the technique in excitation of the suspensions can be extended to other applications in the engineering and biotechnology sciences.
  9. Keywords:
  10. Particle Laden Underflow ; Laser Radiation ; Suspension Preparation ; Motion Detection ; Image Analysis ; Particles Separation ; Microscopic Imaging ; Fluid Density Control

 Digital Object List

 Bookmark

No TOC