Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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A Numerical Analysis of Flow Field in the Silt Nozzle During Cold Spray Coating Process

저온분사 코팅공정에서 초음속 슬릿노즐 사용시 유동장 해석

  • Park, Hye-Young (Division of Materials Science and Engineering, Inha University) ;
  • Park, Jong-In (Division of Materials Science and Engineering, Inha University) ;
  • Jung, Hun-Je (Division of Materials Science and Engineering, Inha University) ;
  • Jang, Kyoung-Soo (Division of Materials Science and Engineering, Inha University) ;
  • Baek, Ui-Hyun (Division of Materials Science and Engineering, Inha University) ;
  • Han, Jeong-Whan (Division of Materials Science and Engineering, Inha University) ;
  • Kim, Hyung-Jun (RIST)
  • 박혜영 (인하대학교 신소재공학부) ;
  • 박종인 (인하대학교 신소재공학부) ;
  • 정훈제 (인하대학교 신소재공학부) ;
  • 장경수 (인하대학교 신소재공학부) ;
  • 백의현 (인하대학교 신소재공학부) ;
  • 한정환 (인하대학교 신소재공학부) ;
  • 김형준 (포항산업과학연구원)
  • Received : 2010.09.27
  • Published : 2011.03.25
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Abstract

The cold spray process is an emerging technology that utilizes high velocity metallic particles for surface coating. Metallic powder particles are injected into a converging-diverging de Laval nozzle and accelerated to a high velocity by a supersonic gas flow. The cold spray process normally uses a circular nozzle that has a rather narrow spraying range. To overcome this fault, a slit nozzle was considered in this study. The slit nozzle is anticipated to reduce the coating process time because it has a wider coating width than the circular nozzle. However, the slit nozzle can reduce the coating efficiency because it does not allow as much gas and particle velocity as the circular nozzle. To improve the coating efficiency of a slit nozzle, the shape of the slit nozzle was modified. And the results of gas flow and particle behaviour according to the nozzlers shape were compared by the a numerical analysis. As a results, as Expansion Ratio(ER) of 7.5 was found to be the most optimal condition for enhancing the spraying efficiency when the ER was changed by the variation of nozzle neck and exit size.

Keywords

Acknowledgement

Supported by : 지식경제부

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