#3379 DESIGN OF A NEW DIAPHRAGM PRESSURE TRANSDUCER FOR DIALYSIS MACHINE

Abstract Background and Aims Diaphragm pressure transducers can cause the dialysis process to be performed at higher quality. Pressure transduction is committed concave, disc-shaped, impervious membranes that divide respective chambers into two hermetically separate compartments: one contains liquid (blood/dialysate) while in other there trapped air. One of sensitive parts design a machine diaphragm transducer which used as gauge. side pressurized, elastically deforming slightly curved shape piezoelectric electrodes built weak electrical signal for measuring pressure. The proper makes it changes result, measured with high accuracy. Simulation flow inside tool designing its housing. Method behavior whole blood non-Newtonian. Under shear forces, viscosity approaches an asymptotic value corresponds when considered Newtonian fluid. Carreau-Yasuda model express relationship between stress strain. Three modified three novel geometries are suggested transducers. Each geometry discretized meshing software. Pyramidal cells mesh computing domain. Ansys Fluent software analyzer program simulate field fluid flow, heat transfer, etc. solution selected based on Due complexity convergence problem, only implicit formulation has been model. assumed steady. governing equation this problem continuity momentum conservation k-ε turbulent flow. Simple algorithm solving. Results main output data distribution. velocity distribution related each other. Figure 1 shows vector schemes. does not affect housing straight port partially impressed shows-center port. results show location modification cannot such way increase sensitivity diaphragm. So, was decided redesign transducer's so apply variation more sensibly. A part added lower face guide toward distributed entire surface reach uniform To find best configuration used; i.e. straight, 90-degree, 120-degree. 2 geometries. In these schemes, circulates effect directly 90-degree newly designed had performance concentrated ports. uniformity becomes But scheme, concentration located exactly middle desirable optimal condition designer seeking. Conclusion series simulations carried out investigate after locations modifications. if directed tangentially, reserved. consideration leads using new wall deflect uniformly.