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Effect of the expansion ratio and length ratio on a gas-particle flow in a converging-diverging cold spray nozzle

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Abstract

A cold spray process is a relatively new process that uses high velocity metallic particles for surface modifications. Metallic powder particles are injected into a converging-diverging nozzle and accelerated to supersonic velocities. Gas accelerates in the throat of the nozzle and reaches a maximum speed at the nozzle exit. Due to compression shocks just outside the nozzle, the gas jet has an irregular shape. Experiments on the expansion ratio and the length ratio of the nozzle, particularly in terms of their relation to the gas pressure, temperature and nozzle length, were conducted for the purpose of reducing the shockwave [1].

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Inha University, Incheon, 402-751, Korea

    Hyun-Boo Jung, Jong-In Park, Sung-Han Park & Jeong-Whan Han

  2. Welding Research Center, RIST, Pohang-si, Gyeongbuk, 790-330, Korea

    Hyung-Jun Kim

  3. Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seoul, 133-791, Korea

    Chang-hee Lee

Authors
  1. Hyun-Boo Jung
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  2. Jong-In Park
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  3. Sung-Han Park
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  4. Hyung-Jun Kim
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  5. Chang-hee Lee
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  6. Jeong-Whan Han
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Correspondence to Jeong-Whan Han.

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Jung, HB., Park, JI., Park, SH. et al. Effect of the expansion ratio and length ratio on a gas-particle flow in a converging-diverging cold spray nozzle. Met. Mater. Int. 15, 967–970 (2009). https://doi.org/10.1007/s12540-009-0967-x

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  • DOI: https://doi.org/10.1007/s12540-009-0967-x

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