Simulation of turbulent flows in an impingement dryer by an extended κ–ε model

✍ Scribed by J.R. Quispe; E. Canales; R. Bórquez

• Book ID: 104268369
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 348 KB
• Volume: 190
• Category: Article
• ISSN: 0045-7825
• DOI: 10.1016/s0045-7825(99)00429-6

✦ Synopsis

Results of numerical simulation of 2D and 3D ¯ow ®eld in a single slot jet discharging tangentially into a con®ned cylinder are presented. This geometry is relevant to new impingement dryers. An extended j±e turbulence model with a near-wall function treatment is used to simulate turbulent jet ¯ows. A ®nite element weighted residual method is used to solve the governing mass, momentum, turbulent kinetic energy and turbulent kinetic energy dissipation equations. The computations were performed for the Reynolds number ranging from 3200 to 31 900. Slot width is varied from 0.5 to 1.0 cm. To verify the algorithm, numerical tests were performed to ensure that the solutions were ``grid independent''. The mesh was constructed with four-node quadrilateral elements. Flow ®elds, velocity pro®les, jet trajectories, recirculating ¯ows and geometry eects were investigated. Recirculating ¯ows were found for Reynolds lower than 6300. Desired velocity pro®les were found for Reynolds upper than 15 000 with slot width of 1.0 cm.