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Dynamics of Thread Movement in Turbulent F low Field

Dynamics of Thread Movement in Turbulent F low Field. James Hallendorff Suman Sinha Ray Alexander L. Yarin. Motivation. Investigate instability mechanism in melt blowing. Initial setup. Used to measure Lagrangian motion. Lagrangian Results. Lagrangian Results. Eulerian Behavior.

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Dynamics of Thread Movement in Turbulent F low 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 • 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 Conclusion: 2 months is not enough

  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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