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Visualization of Flow Pattern and Experimental Investigation of Thermal Performance of Pulsating Heat Pipe with Proposed Fluid

Gandomkar, Amir Reza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48509 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Shafii, Mohammad Behshad
  7. Abstract:
  8. Pulsating heat pipe (PHP) is a two-phase device for the means of transferring high heat fluxes and is used extensively for the electronic cooling. In this study the different flow regimes in PHP with different fluids have been investigated. In this research, 3 different fluids including: Pure fluids, Ferro-fluid and surfactant solution with %50 filling ratio have been used. For ferro-fluid, 5 different concentrations and 3 type of magnetic fields have been operated in 2 different heat pipes. Results show that ferrofluid is more stable in Pyrex made-heat pipe for long period of time and no magnet mode has the best thermal performance due to high conductivity of fluid. In copper made-heat pipe ferrofluid became unstable faster and because of deposition of nano-particles, magnet mode in evaporator section has better effect in performance of heat pipe due to increasing boiling area.In the last part, solution of surfactant has lower surface tension and thermal resistance compared to pure water. Increasing CTAB concentration demonstrates that dry out occurs at lower powers but thermal resistance decreases.At last, comparing result of ferrofluid and surfactant solution, indicates that nano-particles improves thermal performance of pulsating heat pipe by increasing boiling area in evaporator section
  9. Keywords:
  10. Pulsating Heat Pipe ; Nanofluid ; Input Power ; Thermal Shock Resistance ; Flow Regime ; Flow Visualization ; Experimental Investigation

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