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Optimization and Numerical Simulation of the Low-Temperature Plate-Fin Heat Exchanger in the Gifford-McMahon Cycle (GM)

Nouri, Mohammad Ali | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57389 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein
  7. Abstract:
  8. Cryogenics is the study of materials and their behavior at temperatures below -150 degrees Celsius, where gases can liquefy or even solidify. Cryogenics investigates the properties of matter at these cold temperatures, revealing unique physical properties and behaviors that cannot be observed under normal conditions. It is not easy to reach this temperature range and special methods are used to achieve it. The Gifford-McMahon (GM) cycle is one of the most famous thermodynamic cycles for achieving ultra-cold temperatures. When there are limitations for supercooling in terms of space and dimensions, the use of this cycle is more considered. One of the most important parts of this cycle is the heat exchanger, whose performance plays an essential role in the efficiency of the cycle. Despite their small volume, plate-fin exchangers have the highest heat transfer rate compared to spiral wound and coil wound exchangers. For this purpose, they are an ideal choice for use in GM cycles. In this research, the effect of different parameters such as height, thickness of the wall between cells, distance of layers from each other and Reynolds number and several other parameters were investigated. Using the Taguchi method, the effective factors were classified in terms of importance, and in the next step, with the help of the obtained results and using optimization methods, the least volume converter model was presented that would provide the ability to be used in different required conditions
  9. Keywords:
  10. Gifford-McMahon Cryocooler ; Optimization ; Taguchi Method ; Low Temperature Converters ; Plate-Vane Converter ; Liquid Helium ; Plate-Fine Heat Exchange

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