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Numerical Modeling of Flow and Heat Transfer Inside Helical Tubes for Cryogenic Temperature Ranges

Mondegari, Mohsen | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53553 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein
  7. Abstract:
  8. Spiral-wound heat exchangers have special applications in industry due to their high efficiency, especially in low temperature ranges (cryogenic) such as gas liquefaction cycles; However, due to drastic changes in properties, the mechanism of flow and heat transfer in this type of exchangers has not been fully studied yet. Therefore, accurate modeling of fluid flow on both sides of tubes and shells as well as heat transfer between them can be very important in analyzing and designing this type of exchangers and optimizing them to increase the efficiency of the exchanger and the cycle. In this study, the focus is on the flow and heat transfer of supercritical fluid inside helical tubes of spiral-wound heat exchanger near pseudocritical point. A numerical model is provided for heat transfer based on structural variables of the exchanger, such as tube curvature and helical angle as well as fluid and flow properties inside the tubes. The research method in this study is to solve mass, momentum and energy conservation equations numerically in 3 dimensions for the fluid passing through helical tubes using computational fluid dynamics. Finally, by analyzing the results of modeling and validating them with experimental data, relations for Nusselt number and total friction coefficient of the pipe are presented based on geometric variables and dimensionless numbers related to the flow pattern and properties with acceptable errors
  9. Keywords:
  10. Numerical Modeling ; Cryogenic ; Coiled Tube ; Spiral Heat Exchanger ; Spiral-Wound Heat Exchanger

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