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International Journal of Material and Mechanical Engineering
   [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2162-0695 - ISSN (Online) 2164-280X
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • Heat Transfer Performance in Heat Pipe Using Al2O3 –DI Water
           Nanofluid

    • Abstract: Heat Transfer Performance in Heat Pipe Using Al2O3 –DI Water Nanofluid
      Pages 1-5
      Author R. Reji KumarK. SridharM. Narasimh
      Heat pipes are two-phase heat transfer devices with high effective thermal conductivity. This study presents the improvement of thermal performance of heat pipe using Al2O3 nanofluid. The nanofluids kept in the suspension of conventional fluids have the potential of superior heat transfer capability compared to the conventional fluids due to their improved thermal conductivity. The performance of the heat pipe greatly depends on the filling ratio of the working fluid. The Al2O3 – DI water is used as a working fluid. The temperatures at different places on the heat pipe are measured including the temperature of inlet and outlet of the cooling water. The results indicate that the variation of filling ratio, heat input and angle of inclination have a significant effect on its performance.
      PubDate: 2014-02
       
  • Finite-element Analysis of Horizontal-axis Wind-turbine Gearbox Failure
           via Tooth-bending Fatigue

    • Abstract: Finite-element Analysis of Horizontal-axis Wind-turbine Gearbox Failure via Tooth-bending Fatigue
      Pages 6-15
      Author M. GrujicicR. GalgalikarS. RamaswamiJ.S. SnipesV. ChennaR. Yavar
      Wind energy is one of the most promising and the fastest growing alternative-energy production technologies which have been developed in response to stricter environmental regulations, the depletion of fossil-fuel reserves, and the world’s ever-growing energy needs. This form of alternative energy is projected to provide 20% of the US energy needs by 2030. For economic reasons, wind turbines (articulated structures which convert wind energy into electrical energy) are expected to operate, with only regular maintenance, for at least twenty years. However, some key wind-turbine components (especially the gearbox) tend to wear down, malfunction and fail in a significantly shorter time, often three to five years after installation, causing an increase in the wind-energy cost and in the cost of ownership of the wind turbine. Clearly, to overcome this problem, a significant increase in long-term gearbox reliability needs to be achieved. While purely empirical efforts aimed at identifying shortcomings in the current design of the gearboxes are of critical importance, the use of advanced computational methods engineering analyses can also be highly beneficial. The present work demonstrates the use of the finite element analysis in modeling and elucidating the root cause of one of the gear failure modes (i.e. tooth-bending fatigue) under a variety of normal operating and extreme wind-loading conditions.
      PubDate: 2014-02
       
 
 
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