Title page for etd-0610115-122136


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URN etd-0610115-122136
Author Chu-Yu Chung
Author's Email Address No Public.
Statistics This thesis had been viewed 5565 times. Download 254 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Characteristic analysis of electrospinning process using experimental & computational method
Date of Defense 2015-06-26
Page Count 130
Keyword
  • MHD
  • volume of fluid
  • PCL
  • electrospinning process
  • Cone-jet
  • Abstract In this thesis, experimental and numerical methods are applied to study electrospinning process. The interaction between viscosity, rheological properties, electric conductivity, surface tension and contact angle of PCL (Polycaprolactone) polymer from 30 wt% to 50 wt% are analyzed. Then, SEM is used to measure the surface of fiber woven with different concentrations. The experimental results show that the solution weight percentage is proportional to the viscosity; and the highest electric conductivity, 1.24 μS/cm, is measured at 30 wt%. Surface tension is proportional to solution weight percent; the average contact angle is around 73° that indicated PCL is a hydrophobicity material. According to the SEM results, the lower the PCL concentration is used, the more easily the beads on the fibers are produced, and when the fiber diameters for concentration of min. and max. are 0.06 μm of 30 wt% and overall of 55 wt%, respectively. Simulation is based on the multiphase flows module of ANSYS Fluent to analyze the Taylor cone of electrospinning process. Volume of Fluid (VOF) method and Magnetohydrodynamics (MHD) are applied to simulate the influence of liquid-gas interface affected by electrical potential. The influence of changing of operating voltage, flow rate, viscosity, electric conductivity and surface tension was explored. The simulation result shows that when the voltage was increased more, the length of Taylor cone become shorter. The length of Taylor cone become longer as the flow rate and viscosity are increased more. In addition, the length of Taylor cone decreased while the surface tension increased. The electric conductivity shows less influence on the length of Taylor cone. In this study, the Cone-jet of Taylor cone is simulated which can support the measured data of experimental can be the reference for the future application.
    Advisory Committee
  • Shiao-Wei Kuo - chair
  • Zong-Hsin Liu - co-chair
  • Tsung-Tien Wu - co-chair
  • Yong-Jheng Chen - co-chair
  • Kuang-Chuan Lin - advisor
  • Cheng-Tang Pan - advisor
  • Files
  • etd-0610115-122136.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2015-07-10

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