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Numerical Analysis of Underwater and Within Air Sound Generation by using Carbon Nanotube

Saleki, Omid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47076 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. Carbon nanotubes have special thermodynamic properties which makes suitable as a thermo-acoustic sound source. Recently it is shown that by using these nanotubes it is possible to generate strog sound waves in air or water. Experimental analysis of phenomenon can be complicated and expensive. Hence this fact, in this study using molecular dynamic simulation, numerical analysis of sound generation with CNTs in air and water is discussed. For this purpose, the required structue of the system is generated and it has reaced equilibrium. This process has been done for 6 different CNT and for each CNT there are 5 different distances between them. Althogether, 30 different cases has is used for simulation. Then, by applying a thermal wave with defined amplitude and frequency around the CNT, a pressure wave is created at a certain distance of it. Finally, the effects of various factors on the amplitude of the pressure wave is examined. These factors include the effects of nanotube diameter, the distance between nanotubes, the amplitude and the frequncy of the applied thermal wave. Also, gathering of air molecules around CNTs the hydrophobicity of them has been
    studied. The results show that, increase in the diameter of CNTs, amplitude and the frequency of thermal wave and decrease in the distance between CNTs lead to the increase in the ampliude of pressure wave and the strength of the generated sound
  9. Keywords:
  10. Thermoacoustic Effect ; Sound ; Molecular Dynamic Simulation ; Carbon Nanotubes ; Pressur Wave

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