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Design and Development of Non-Newtonian Droplet-based Logic Microfluidics Using Passive Method

Asghari, Elmira | 2022

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55768 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Droplet-based microfluidic logic gates have many applications in diagnostic tests and biosciences due to their automation and cascading ability. Although most biological fluids, such as blood, exhibit non-Newtonian properties, all previous studies in this field have been with Newtonian fluids. Additionally, none of the previous work has studied the functional area of logic gates. In the present work, AND-OR logic gate with power-law fluid is considered. The effect of important parameters such as non-Newtonian fluid properties, droplet length, capillary number, and geometrical properties of the microfluidic system on the operating region of the system has been investigated. The results show that the operation mechanism of AND and OR states are opposite to each other. With the increase in droplet length, capillarity number, and power-law index, the operating region of the AND state increases, but the operating region of the OR state decreases. For a logic gate to work properly, this gate must work properly in both AND and OR states. As a result, by combining the operating region of these two states, the overall operating region of the logic gate is obtained. One of the important phenomena in logic gates is droplet breakup. For this reason, in the present work, we have solved analytically and numerically the breakup of a non-Newtonian drop in a T-junction. We have presented the effect of droplet length, capillarity number, and channel width ratio on droplet breakup in the form of a general formula. The results show a low relative error. In the end, we have introduced a universal logic gate (NOR) that can be used to build any logic circuit. Therefore, we have reduced the elements necessary to make a logic circuit to only one element (NOR gate), which makes it easier to design and implement logic circuits.
  9. Keywords:
  10. Drop Breakage ; Microfluidic System ; Non-Newtonian Fluids ; Nonnewtonian Liquid Drops ; Logic Gate ; Universal Logic Gate ; Logic Circuits

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