Jet impingement on cylindrical cavity: Conical nozzle considerations

• Published in: Journal of fluids and structures Vol. 23; no. 7; pp. 1106 - 1118
• Main Authors: Shuja, S.Z., Yilbas, B.S., Budair, M.O.
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.10.2007; Elsevier
• Subjects: Analytical and numerical techniques; Applied sciences; Blanking. Shearing; Cavity; Computational fluid dynamics; Conical nozzle; Conical nozzles; Cutting; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Heat transfer; Holes; Jet impingement; Lasers; Mathematical analysis; Metals. Metallurgy; Nozzles; Physics; Production techniques; Structural steels; Conical nozzle; Jet impingement; Cavity; Energy flow; Cone; Interaction; Laser cutting; Heat flow; Metal; Steel; Cavity flow; Modeling; Cylindrical cavity; Jet; Turbulence structure; Heat transfer
• ISSN: 0889-9746; 1095-8622
• DOI: 10.1016/j.jfluidstructs.2007.03.005

In laser gas-assisted processing, the assisting gas emerges from a nozzle and nozzle geometric configurations alter the flow structure and heat transfer characteristics in and around the section processed. In the present study, the influence of nozzle geometric configurations, cavity diameter and depth, on flow structure and heat transfer rates from the cavity is investigated. A cylindrical cavity with two diameters and varying depths is accommodated in the simulations. Air is used as assisting gas while steel is employed as workpiece material. A numerical scheme using a control volume approach is accommodated to discretize the flow and energy equations. It is found that flow structure changes significantly for large diameter cavity. The influence of the nozzle cone angle on heat transfer and flow structure is more pronounced as the cavity depth increases.