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0 ResultsProject Goal: Compare the hydrodynamic mixing performance of two jar-test impeller geometries — a standard flat paddle and a 45° pitched-blade impeller — to determine whether geometry affects mixing uniformity and coagulant dose accuracy in water treatment jar testing. Simulation Type: Incompressible steady-state fluid flow using the Multiple Reference Frame (MRF) method for the rotating impeller region. Project Description: 4th year Mechanical Engineering FYP at MTU Ireland. The standard jar-test apparatus uses a flat rectangular paddle to mix water samples during coagulation-flocculation testing. Full-scale water treatment plants use pitched-blade impellers generating axial circulation and more uniform shear. This geometric mismatch is the central research question. The simulation models a 1-litre cylindrical jar containing single-phase water at ambient temperature — no chemistry, no particles, no multiphase modelling. Two impeller geometries are tested separately using MRF. Turbulent dissipation rate ε is extracted and used to calculate velocity gradient G = √(ε/ν), producing G contour maps comparing both geometries. Dead zones, circulation patterns and power number are also extracted. Results will be validated against theoretical G values from power correlations — P = Np·ρ·N³·D⁵ — and cross-referenced against physical jar-test turbidity data.
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by Jon_WildeJon_Wilde
r00225759 created this project
15 days ago
0 Geometries 0 Meshes 0 Simulation setups 0 ResultsProject Goal: Compare the hydrodynamic mixing performance of two jar-test impeller geometries — a standard flat paddle and a 45° pitched-blade impeller — to determine whether geometry affects mixing uniformity and coagulant dose accuracy in water treatment jar testing. Simulation Type: Incompressible steady-state fluid flow using the Multiple Reference Frame (MRF) method for the rotating impeller region. Project Description: 4th year Mechanical Engineering FYP at MTU Ireland. The standard jar-test apparatus uses a flat rectangular paddle to mix water samples during coagulation-flocculation testing. Full-scale water treatment plants use pitched-blade impellers generating axial circulation and more uniform shear. This geometric mismatch is the central research question. The simulation models a 1-litre cylindrical jar containing single-phase water at ambient temperature — no chemistry, no particles, no multiphase modelling. Two impeller geometries are tested separately using MRF. Turbulent dissipation rate ε is extracted and used to calculate velocity gradient G = √(ε/ν), producing G contour maps comparing both geometries. Dead zones, circulation patterns and power number are also extracted. Results will be validated against theoretical G values from power correlations — P = Np·ρ·N³·D⁵ — and cross-referenced against physical jar-test turbidity data.
