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Effect of tiO_2 Nanoparticles on Heat and Drag Properties of Dilute Polymer Solutions
Paryani, Sadra | 2015
1953
Viewed
- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 46775 (57)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Ramezani Saadat Abadi, Ahmad; Mohammadi, Mohammad Reza
- Abstract:
- In the present work, the experiments were carried out for two types of PAM (3330 and 3630) with three distinct concentrations (25, 40 and 55 ppm) and TiO_2-water nanofluid for four concentrations (1.5, 2, 2.5 and 3 vol. %), and the Nusselt number and friction factor for each of them expressed separately. The Reynolds number was in the range from 11000 to 21000. The steady state turbulent convective heat transfer and friction factor of the combination of TiO_2-water nanofluid and polymer 3330 in the coiled tube were investigated. The effects of the Reynolds number for 2 vol. % nanoparticles which consists of 25 ppm PAM (3330) determined at the constant temperature of 24°C. It was observed that the friction factor decreased with increasing Re number after threshold Re number. The Nusselt number can be increased with the augmentation of Reynolds number, but the optimum concentration from polymer and nanofluid should be applied. Furthermore, the trend is unknown and must be examined for specific Reynolds number, especially at high Re numbers. At Re = 21000, Nusselt number increased 5% and the friction factor decreased 8%
- Keywords:
- Polymers ; Nanofluid ; Drag Reduction ; Titanium Dioxide Nanoparticles ; Convection Heat Transfer ; Turbulent Flow ; Coiled Tube
Digital Object List-
محتواي کتاب - view
Bookmark- 1.1 Nanofluid
- 1.2 Polymer
- 1.2.1 Drag reduction
- 1.2.2 Heat transfer
- 2.1 Nanofluid
- 2.2 Thermo physical properties of nanofluids
- 2.2.1 Density
- 2.2.2 Specific heat
- 2.2.3 Viscosity
- 2.2.4 Thermal conductivity
- Table 2.2 summary of the theoretical and experimental models for effective thermal conductivity of nanofluids [34]
- Table 2.2 (continued)
- Table 2.2 (continued)
- Fig. 2.6 Comparison of the thermal conductivity equations of nanofluid [32]
- Fig. 2.7 Thermal conductivity of Ti,O-2./water nanofluid as a function of temperature and volume fraction [2]
- 2.3 Thermo physical properties of base fluid
- 2.4 Average bulk mean temperature
- 2.5 Convective heat transfer theory of nanofluid
- 2.6 Effect of the properties variation
- 2.6.1 Effect on the Prandtl number
- 2.6.2 Effect on the Reynolds number
- 2.6.3 Effect on the convective heat transfer coefficient
- 2.7 Mechanism of nanofluid
- 2.8 Friction factor
- Table 2.5 Friction factor for different flow regimes [10, 36].
- Table 2.6 some vital equations for friction factor of single phase fluid [2, 6, 10, 37]
- Fig. 2.13 Variation of pressure drop and Reynolds number at different particle concentration for ,SiO-2. [10]
- Fig. 2.14 Friction factor-Reynolds number [11]
- Fig. 2.15 Experimental data and calculated results of pressure drop in turbulent flow [36]
- Fig. 2.16 Pressure drop in turbulent flow: comparison between experiments and estimates by regression [36]
- 2.9 Polymer
- 2.10 Parameters influencing the performance of polymers
- 2.11 Heat transfer of polymers
- Fig. 2.19 Turbulent heat transfer in water N and in a drag-reducing polymer solution consisting of 50 ppm polyethylene oxide in water P. the decrease in Stanton number for the dilute dpolymer solution relative to pure water is shown at three Prandtl ...
- Fig 2.20 Relative Nusselt number for pipe, as a function of polymer concentration for various Reynolds numbers
- 2.12 Mechanical degradation effect
- Fig. 2.21 Friction coefficient vs. apparent Reynolds number for water, undegraded 200 ppm solution, and both degraded (#1) and undegraded (#3) 20 ppm solutions of AP-273 separan in water [18]
- Fig. 2.22 Nusselt number vs. apparent Reynolds number of water, undegraded 200 ppm solution, both degraded (#1) and undegraded (#3) 20 ppm solution of AP-273 in water [18]
- 2.13 Polymers problem
- 2.14 Preparation of nanofluid
- 2.14.1 Single-step method
- 2.14.2 Two-step method
- 3.2 preparation of polymers
- 3.3 Experimental apparatus
- 3.4 Conditions of the experiment
- 4.1 Validation
- 4.1.1 Friction factor
- 4.1.2 Heat transfer coefficient
- 4.2 Polymers
- 4.2.1 Friction factor
- Fig. 4.7 Friction factor for dilute aqueous solutions of PAM (3330, Mw = 8 × ,10-6.) with different concentrations of 25, 40 and 55 ppm in the turbulent regime
- Fig. 4.8 Friction factor for dilute aqueous solutions of PAM (3630, Mw = 20 ×,10-6.) with different concentrations of 25, 40 and 55 ppm in the turbulent regime
- 4.2.2 Heat transfer coefficient
- Fig. 4.9 The decrease in the Nu number for dilute polymer of PAM (3330, Mw = 8 ×,10-6.) with different concentration of 25, 40 and 55 ppm relative to the distilled water
- Fig. 4.10 The reduction in the Nu number for dilute polymer of PAM (3630, Mw = 20 ×,10-6.) with different concentration of 25, 40 and 55 ppm relative to the distilled water
- 4.3 Nanofluid
- 4.3.1 Friction factor
- 4.3.2 Heat transfer coefficient
- 4.4 Combination of polymers and nanofluid
- 4.4.1 Friction factor
- 4.4.2 Heat transfer coefficient
- 4.5 Conclusions
- References