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Sonic Impinging Jet Flows in an Industrial Air Knife
Kannan Shaji,Seok Woo Son,Abhilash Suryan,Heuy Dong Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Gas jet wiping is a recommended process to remove the fluid layer thickness over a solid surface. Recently air knifes are being chosen as a novel device in various processes such as hot dip galvanization, paper and photographic film production (1) etc. Impinging jet flow also plays an important role in the quenching process. After the rapid cooling process, an air knife is employed for removing the fluid particles precipitated over the solid surface (2). Since the quality and the defect rate of the product directly depend upon the particle removal performance of the air knife, the production cost can be minimalized by optimizing the wiping gas jet. The current work focuses on the Computational Fluid Dynamics stimulation of an industrial air knife jet flow, impinging on the water layer over a solid surface. Figure 1 shows the schematic diagram of the industrial air knife that makes use of a sonic jet. A two-dimensional compressible Reynolds-Averaged Navier-Stokes equations are solved for an implicit finite volume scheme to investigate the impinging jet flow characteristics. The computational results show the effects of pressure ratio and temperature ratio on the flow field. The paper proposes an optimal flow condition for the impinging gas jet wiping process.