Abstract
The Non-Invasive Ventilator (NIV) is used widely for the treatment of patients suffering from respiratory disorders. The bi-level positive pressure in NIV therapy is provided using pressurized air. The supplementary oxygen is added to the circuit during NIV therapy. The mixture of oxygen and air is provided to the patient through the face mask. At present, the higher FiO2 (i.e., the mole fraction of oxygen in the mixture of air and oxygen) is difficult to achieve in NIV therapy. The higher FiO2 is required for critical patients and the use of NIV therapy is limited to selected minority patients. Thus, a strong need to increase FiO2 exists in NIV therapy. The Computation Fluid Dynamics (CFD) method is used to simulate the mixing of air and oxygen in NIV therapy. The CFD solver is validated by simulating the present solution which is an oxygen adapter and comparing simulation results with hand calculations. The new mixing chamber is suggested. The testing of the mixing chamber was carried out in the previously validated CFD solver and results were obtained. The work aimed at enhancing FiO2 at outlet of the mixing chamber. The effect of geometric parameters of the mixing chamber, viz. convergent-divergent angles, flow direction, and throat diameter is discussed in the results. The ANSYS Design Explorer is used to study the overall effect of all parameters and optimization of parameters. The optimal combination of the above parameters showed a 40 % improvement in FiO2 compared to the oxygen adapter. The optimal combination of the above parameters can provide support for research, design, and manufacturing.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call