Rohit Nuli

Dental isolation system optimization Initial Model Fluid channel Fluid channel was extracted using boolean and surface operations. Named the inlets to measure the flow rates through each inlet. ● ● 5 4 3 2 1 Mesh optimization of the fluid volume ● ● ● Auto mesh created using Ansys meshing was optimised to be quad dominant. Adjusted mesh sizing to 4.5e-4. No of Elements = 65635 No of Nodes = 56339 Before optimization After optimization Flow rate conversion ● ● ● Flow rate of 5 SCFM is deemed noticeable for dental procedures. This flow rate is used for the outlet boundary condition, to convert SCFM to Kg/s the following formula was used. Z = compressibility, R = universal gas consatant Boundary Conditions ● ● ● ● ● Created named selections for inlets, outlet and walls. Inlet boundary condition : pressure inlet (0 gauge pressure) Outlet boundary condition: mass flow outlet (0.003kg/s) Wall boundary condition : No slip boundary. Turbulence flow model : k-epsilon model. Inlet = blue, outlet = red Results Velocity vectors Results Observations ● ● ● Inlets farther away from the exhaust are doing little to no suction. Tongue side inlets 4,5,6,7 and working side inlets 4,5 are example of this. Also a clear relation between the flow rates and surface area of the inlet has been identified. Optimization goals ● ● The optimized design should have a more balanced suction through out all the inlets. Inlets farther from the exhaust should account for a significant portion of the suction since this is where the most of the work is done. Design Changes ● ● ● ● Added a central rail to the design, which is significantly wider than the fluid channel connecting the inlets. Made the fluid channel connecting the inlets narrower, so that we can reduce the suction in inlets closer to the exhaust (1 and 2) Added connecting tubes between the central rail and initial fluid channel to increase the flow rate at the dar end. An alternative design was created by making the fluid channel a closed loop, so that we connect the farthest inlet to the central rail. Designs Design 1 Design 2 Results: Design 1 Before Modification After Modification (Design 1) Results Results Results: Design 2 Before Modification After Modification (Design 1) Results Results Comparing Design 1 to Design 2 Velocity vectors - Design 1 Velocity vectors - Design 2 Comparing Design 1 to Design 2 Comparing Design 1 to Design 2