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Thermal and Hydrodynamic Analyses of Shell and Tube Heat Exchangers in Different Flow Regimes Using Semi-Full-Scale Simulation Approaches

Hassanpour Matikolaee, Mohammad Reza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53053 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. One main problem in many numerical simulations is the lack of sufficient infrastructure data to precisely model and analyze the flow through complex geometries. Since experimental procedures are generally very expensive; and sometimes impossible, it becomes necessary to find alternative ways such as numerical approaches to predict the flow behavior through complex geometries. The heat exchangers can be categorized as geometries with complex configuration and apparently expensive to solve numerically. They are widely used in different industries including the aerospace. The restrictions in design and implementation of aviation’s heat exchangers have promoted the related companies to converge to heat exchangers with low weight and small sizes; however, great heat transfer performances. One may find many new invented technologies in such heat exchangers. Such technologies have eventually led to more complex geometries; albeit with more difficulty in their numerical treatments. The purpose of this research is to simplify the numerical simulation of complex shell and tube heat exchangers. In design procedures, it is necessary to simulate one heat exchanger so many times to approach to an optimized one. Due to large number of pipes and the need for extensive meshing, it is not legal to perform so many full-scale simulations. Therefore, it is necessary to find alternative ways with less computational costs. The current approach cuts one simple section from the main heat exchanger. This separated sector is simulated for so many different conditions. Then, the hydrodynamics and thermal diagrams are derived for this separated sector. Next, the derived diagrams are suitably developed to calculate the thermal and hydrodynamics performances of the optimum heat exchanger. Indeed, this sectional simulation and then the assemblage of individual results into the main heat exchanger dramatically reduce the computational cost in comparison with the full-scale simulation approaches. Additionally, new dimensionless quantities are suitably introduced for the selected shell and tube heat exchanger to reduce the optimization procedure. Using this simplified model and benefiting from the developed approach for this simplified model, they help to design and analyze optimum heat exchangers for various industry applications with minimum computational efforts
  9. Keywords:
  10. Heat Transfer ; Heat Exchangers ; Hydrodynamics ; Numerical Simulation ; Laminar Flow ; Turbulent Flow ; Shell and Tube Heat Exchenger ; Full-Scale Simulation

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