Flow, Turbulence and Combustion

, Volume 102, Issue 2, pp 345–353 | Cite as

Orifice Jet Control Using Sub-Flows Issuing from Circular and Non-Circular Openings

  • Mizuki KitoEmail author
  • Takahiro Fujimatsu
  • Kunikazu Kondo


Nozzle shapes offer the possibility of a passive control technique to provide high mixing and heat transfer rates. Thus, a number of investigations have been carried out to elucidate the influence of nozzle configuration including noncircular orifices on the flow and heat transfer characteristics. This paper demonstrates the effects of sub-flows issuing from different shaped openings on main orifice air jet flow characteristics. Mean velocity measurements by a constant temperature hot-wire anemometer are carried out at a Reynolds number of Re = 2.2 × 104 to investigate the flow characteristics of orifice jets with sub-flows. The effects of the opening shape on the main orifice flow are also demonstrated by flow visualization. It is shown that the potential core lengths and mixing characteristics with ambient fluids of orifice jet flows can be controlled by the sub-flows.


Free jet Non-circular sub-flows Nozzle 


Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Mizuki Kito
    • 1
    Email author
  • Takahiro Fujimatsu
    • 1
  • Kunikazu Kondo
    • 1
  1. 1.National Institute of Technology, Suzuka CollegeMechanical EngineeringSuzukaJapan

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