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Investigation of Flow Field in a Small-Scale Cleanroom by Design and Implementation of Stereoscopic Particle Image Velocimetry

Asadi, Masoud | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51821 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hasan; Zabetian Toroghi, Mohammad
  7. Abstract:
  8. The air distribution is the main factor of contaminant transportation in cleanrooms. The experimental method is the most reliable one for investigation of flow field, which the difficulties associated with it, has limited not only the examination of the flow field in cleanrooms, but also the improvement of their qualities. Most of the experimental researches in indoor air quality concern conventional rooms and do not take into account specific supply-exhaust diffuser configurations, which are used in cleanrooms. Using small-scale models can reduce the complexity and the cost of measurements. In this research, the 3D velocity field of a small-scale cleanroom is measured in three different areas. Three different supply diffuser configurations, namely (1) in line (2) diagonal (3) mixed, and two different ventilation flow rate in each of them are investigated. For this purpose, a stereoscopic particle image velocimetry system is designed and set up, in which the images of calibration targets and the simultaneous images of flow filed are processed by a series of developed MATLAB codes; finally, the 3D velocity filed is reconstructed. The code is verified in comparison with authentic codes. The measured velocity data is compared with a hotwire anemometer measured data, and validation of the data is confirmed. Finally, the 3D instantaneous and average velocity field is measured inside the test room, and the results are reported. Flow structures in the instantaneous and average velocity field are discussed. In the end, analysis of the results shows that an increase in ventilation flow rate has a desirable effect on the flow pattern; also, the diagonal configuration of supply-exhaust diffusers configuration offers a more favorable pattern than two other configurations
  9. Keywords:
  10. Clean Room ; Small Scale Modeling ; Stereoscopic Particle Image Velocimetry (SPIV) ; Ventilation Flow Rate ; Supply-Exhaust Configuration

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