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Shokrani, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45093 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. In recent years, different of nanoparticles as oil additives has been investigated in many studies . These research show that nanoparticles are deposited on the surface friction and improve tribology properties of base oil and also significant reduction of wear and friction caused by the nanoparticles. Compared with metal and metal oxide nanoparticles , carbon nanotubes (CNT) due to the high thermal conductivity and high aspect ratio , is an excellent candidate as the nanoparticle is dispersed . For preparing useful oil it is essential to stabilize nanoparticles in fluid that will not settle over long time . Oils containing nanoparticles by increasing the heat transfer coefficient increase efficiency and reduce fuel consumption to be followed . Different methods are used to stabilize nanoparticles one of these methods is the use of surfactants . In this study This method is used and four types of surfactants were applied to stabilize carbon nanotubes in oil . The zeta potential test was used to compare stabilization of different coated nanotubes , C type coated nanotubes had supreme quantity (35/1 mV) . To understand the impact of nano-tubes containing different surfactants on heat transfer performance of oil we develop test use of transient heat transfer equation . The experimental results indicate that heat transfer coefficient of C type carbon nanotube coated was 2.5 times as much as base oil . Also to be aware of the impact of nanotubes on lubricant function , measurement of friction coefficient test was used and the results obtained by the reduction of 0/015 compare of base oil . In the last stage of research the SEM microscope images were used , altering morphology of the carbon nanotubes in various surfactants was quite evident
  9. Keywords:
  10. Carbon Nanotubes ; Heat Transfer ; Friction Coefficient ; Nanooil

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