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Production of Liquid Metal Micro-droplets and Electrical Control of their Size and Rate of Formation

Asiabi Mollahaji, Arezoo | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55652 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kebriaee, Azadeh
  7. Abstract:
  8. The use of liquid metal droplets due to their high electrical and thermal conductivity are used in various industries today. One of the methods of producing these micro-droplets is the flow focusing method, which is widely used to produce integrated and monodispersed droplets. Liquid metals have high surface tension and these micro-droplets are formed only if there is sufficient shear force between the liquid metal and a continuous fluid phase. In the past, they used several different methods such as pressure fluctuations and changes in continuous phase flow rate to control the shear force and produced polymer, gas, etc. micro-droplets.In this research, use the electric potential to control the interphase shear force. The device consists of two micro-channels, one microchannel for liquid metal and the other for a fluid that cannot be mixed with this liquid metal, and the dimensions of the micro channels are about 140 microns. Finally, by changing the electrical potential applied to the inputs and reducing the surface tension of the liquid metal, the droplet diameter can be changed. This design can be used as a tool in the measurement calibration system due to the controllable droplet size. Control over the quality of droplet production in this work is done by producing transparent micro-channels and imaging system with Shado-graphy technique. To measure the production quality of the created droplets, a measuring stop with an accuracy of about 2 micrometers is used.
  9. Keywords:
  10. Liquid Metal ; Capillary Number ; Surface Tension ; Voltages ; Microchannel ; Injection Rate ; Flow Focusing Device ; Microdroplets

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