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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39666 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Saeedi, Mohammad Hassan; Saeedi, Mohammad Saeed; Shafii, Mohammad Behshad
- Abstract:
- Thermopneumatic micropump is one type of positive displacement micropumps, which has many applications due to its relatively large stroke volume, low working voltage, and simple fabrication in microscale. In this paper, a numerical study of heat transfer and fluid flow in a valveless thermopneumatically driven micropump is presented. For rectifying the bidirectional flow, a nozzle and a diffuser are used as the inlet and outlet of the chamber. Since the fluid flow is induced by the motion of a diaphragm, the numerical simulation includes fluid structure interaction, which requires applying a dynamic mesh. The domain of solution is divided into two sections; the actuator unit, which contains the secondary fluid, and the main chamber through which the working fluid is passing. By performing a scale analysis on the terms of the energy equation, heat transfer is modeled as one dimensional. Solving the coupled system of equations of heat transfer and the equations governing the diaphragm motion, the temperature distribution, the pressure variations, and the center deflection of the diaphragm are obtained. In the next step, by applying the boundary condition of deforming wall, the three dimensional fluid flow is simulated. In order to validate the model, the numerical results are compared with some experimental data, which shows fair consistency. According to the results of the three dimensional simulation, the rectification efficiency for the nozzle and diffuser channels depends on the frequency
- Keywords:
- Numerical Modeling ; Nozzle Difusser ; Diaphragm ; Thermopneumatic Micropump ; Dynamic Mesh
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