Loading...

Interferometric Laser Imaging for Droplet Sizing (ILIDS)in Sparse Sprays

Rezaee, Hassan | 2020

539 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52825 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kebriaee, Azadeh
  7. Abstract:
  8. In the present work we first introduced ILIDS and review the theory of interferometry and light scattering from droplets. Bases on ILIDS method, droplets are irradiated by monochrome sheet laser, where the superposition of reflected and first-order refracted beams form a parallel fringe pattern at out of focus plane on the imaging sensor in the forward-scatter region. This pattern can be related to the droplet size by using simple geometrical optics. For the present work, an image processing algorithm is utilized to capture weak and noisy images of droplets to reduce the lost data in the sizing procedure. Since ILIDS method is applied for small and dilute spray, it is suitable for electrospray with Sauter Mean Diameter less than 20 microns.All effective parameters have been analyzed and their effect and the uncertainty created by them have been investigated and reported.ILIDS also applied to three different modes of electrospray. Electrospray is applied to form very fine, small and monodisperse droplets using in pharmaceutical manufacturing, spaceship thrusters, and electrospinning. In this paper, the size distribution of electrospray in various modes has determined by (ILIDS). Two parameters including mass flow rate and applied voltage are considered as independent variables affecting on droplet sizing in the electrospray. Generally, our results confirm that a uniform distribution is formed in downstream of jet breakup in electrospray. The more populated region of spray is attributed to the axial zone near the point of breakup, where the unstable jet is disintegrated to droplets with larger diameters
  9. Keywords:
  10. Electrospray ; Interference ; Lasers ; Geometrical Optics ; Droplet Size Measurment ; Interferometric Method

 Digital Object List

 Bookmark

No TOC