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Dynamics of Thread Movement in Turbulent Flow Field

Investigating instability mechanisms in melt-blowing process using Lagrangian and Eulerian results, FFT analysis, snapping point determination, and future research suggestions. With acknowledgements to relevant sources and grants.

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Dynamics of Thread Movement in Turbulent Flow Field

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  1. Dynamics of Thread Movement in Turbulent Flow Field James Hallendorff Suman Sinha Ray Alexander L. Yarin

  2. Motivation Investigate instability mechanism in melt blowing

  3. Initial setup • Used to measure Lagrangian motion

  4. Lagrangian Results

  5. Lagrangian Results

  6. Eulerian Behavior

  7. Eulerian Results Fast Fourier Transform

  8. FFT Results

  9. Harmonics Many harmonics, few that make a difference

  10. Is This Chaotic??

  11. Snapping Point Determine correlation between string length and snapping length or air velocity and snapping length

  12. Snapping point error Gravity causes artificial snapping point-makes unreliable results New setup

  13. Vertical Setup

  14. Width to Length Ratio

  15. Revised Measurement Strategy Using a fixed-length criteria skews results Compare ratios of width to snapping length

  16. Future Work Conclusion: 2 months is not enough Use the frequencies found in the FFT to augment theoretical model Analyze the movement of the string in a vertical position Use polymer solution to simulate melt blowing and to compare it to the thread movement model

  17. Acknowledgements "MELT BLOWN TECHNOLOGY." UT Knoxville | College of Engineering. Web. 16 July 2009. <http://www.engr.utk.edu/mse/pages/Textiles/Melt%20Blown%20Technology.htm>. EEC-NSF Grant #0755115 Dr. Takoudis Dr. Jursich Qian Tao

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