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Experimental Investigation of Thermal Performance of Pulsating Heat Pipe Filled with Hybrid Nanofluid

Alishiri, Mojgan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52790 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Today, oscillating heat pipes play an undeniable role in energy recovery due to their high thermal capacity. Studies show that the working fluid plays a more effective role in improving the performance of the oscillating heat pipes. In this study, a model is proposed to determine the optimal concentrations of Fe3O4-MWCNT/DI Water hybrid nanofluid based on NSGA-II multi-objective optimization algorithm. The Thermophysical properties of the fluid have been optimized to obtain the concentrations that provide the highest thermal conductivity and specific heat capacity and the lowest dynamic viscosity and density for hybrid nanofluids. Then a number of these concentrations¬ have ¬been selected for the synthesis of hybrid nanofluids and testing in the 5-round heat pipe. The thermal performance of the oscillating heat pipe with ¬various hybrid nanofluids has been tested. The results showed that nanofluid containing 0.559% Fe3O4 nanoparticles and 0.1% MWCNT nanoparticles had the best thermal performance for oscillating heat pipe compared to other nanofluids. Also The thermal performance of the oscillating heat pipe with pure water working fluid has also been compared with other hybrid nanofluids and better starting and lower thermal resistance of oscillating heat pipe with pure water working fluid have been obtained. Therefore, it can be concluded that the Fe3O4-MWCNT/DI Water hybrid nanofluid has relatively high thermal conductivity but higher viscosity, lower specific heat capacity and instability due to the increase in concentration decreased the performance of the oscillating heat pipe compared to the base fluid
  9. Keywords:
  10. Instability ; Optimal Concentration ; Pulsating Heat Pipe ; Combined Nanofluid ; Non-Dominate Sorting Genetic Algorithm (NSGAII) Method ; Optimization Algorithms

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