Computational Fluid Dynamics 2011 Part 15 pdf

Computational Fluid Dynamics 414 Fig. 1. Geometry of the clarifier Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier 415 (a) (b) (c) Fig. 2. Meshes of the clarifier (a) whole clarifier (b) reaction well, inlet pipe, and draft tube (c) blades Computational Fluid Dynamics 416 Fig. 3. Velocity vector of water flows (inlet velocity = 0.3 m/s, impeller rotation speed = 0.3 rad/s) Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier 417 (d) t = 1200 s (BWTP) (h) t = 3600 s (CFD) (c) t = 900 s (BWTP) (g) t = 3300 s (CFD) (b) t = 600 s (BWTP) (f) t = 3000 s (CFD) (a) t = 0 s (BWTP) (e) t = 2400 s (CFD) Fig. 4. Contour of solid volume fraction on water surface (a) t = 0 s (BWTP) (b) t = 600 s (BWTP) (c) t = 900 s (BWTP) (d) t = 1200 s (BWTP) (e) t = 2400 s (CFD) (f) t = 3000 s (CFD) (g) t = 3300 s (CFD) (h) t = 3600 s (CFD) Computational Fluid Dynamics 418 Fig. 5. Contour of solid volume fraction in clarifier (a) Type A, t = 1200 s (b) Type A, t = 2400 s (c) Type A, t = 3600 s (d) Type B, t = 1200 s (e) Type B, t = 2400 s (f) Type B, t = 3600 s (g) Type C, t = 1200 s (h) Type C, t = 2400 s (i) Type C, t = 3600 s (j) Type D, t = 1200 s (k) Type D, t = 2400 s (l) Type D, t = 3600 s Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier 419 (a) (b) (c) Fig. 6. Velocity vector of water flows (inlet velocity = 0.3 m/s, impeller rotation speed ω = 0.3 rad/s). (a) Type B (b) Type C (c) Type D Computational Fluid Dynamics 420 Fig. 7. Effluent solid flux of four constructions of clarifiers time (sec) 1500 2000 2500 3000 3500 effluent flux (kg/m 2 -s) 0.00 0.05 0.10 0.15 Type A Type B Type C Type D . Computational Fluid Dynamics 414 Fig. 1. Geometry of the clarifier Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier 415 (a) (b) (c). Type D Computational Fluid Dynamics 420 Fig. 7. Effluent solid flux of four constructions of clarifiers time (sec) 150 0 2000. (e) t = 2400 s (CFD) (f) t = 3000 s (CFD) (g) t = 3300 s (CFD) (h) t = 3600 s (CFD) Computational Fluid Dynamics 418 Fig. 5. Contour of solid volume fraction in clarifier (a) Type A, t