한국입자에어로졸학회지 (Particle and aerosol research)

  • 제9권4호
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  • Pages.271-277
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  • 2013
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  • 1738-8716(pISSN)
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  • 2287-8130(eISSN)
한국입자에어로졸학회 (Korean Association for Particle and Aerosol Research)
권호 표지
DOI QR코드

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카본나노튜브 나노유체의 동점성계수 증가로 인한 관내 유동에서의 항력 감소

Drag Reduction Induced by Increased Kinematic Viscosity of Nanofluids Containing Carbon Nanotubes in A Horizontal Tube

  • 유지원 (포스코) ;
  • 정세권 (현대자동차) ;
  • 최만수 (서울대학교 기계항공공학부 멀티스케일 에너지 시스템 연구단)
  • Yu, Jiwon (POSCO) ;
  • Jung, Se Kwon (Hyndai Motor Group) ;
  • Choi, Mansoo (Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University)
  • 투고 : 2013.12.10
  • 심사 : 2013.12.16
  • 발행 : 2013.12.30
⟨ 이전 논문 다음 논문 ⟩

초록

This article reports the drag reduction phenomenon of aqueous suspensions containing carbon nanotubes (CNTs) flowing through horizontal tubes. Stable nanofluids were prepared by using a surfactant. It is found that the drag forces of CNT nanofluids were reduced at specific flow conditions compared to the base fluid. It is found that the friction factor of CNT nanofluids was reduced up to approximately 30 % by using CNT nanofluids. Increased kinematic viscosities of CNT nanofluids are suggested to the key factors that cause the drag reduction phenomenon. In addition, transition from laminar to turbulent flow is observed to be delayed when CNT nanofluids flow in a horizontal tube, meaning that drag reduction occurs at higher flow rates, that is, at higher Reynolds numbers.

키워드

참고문헌

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