12/30/2023 0 Comments Jing zhang iupuiGills allow fish to draw oxygen from water, and that design is incorporated into the prototype mask. The challenge was to find a structure that blocks out tiny aerosol particles while also providing proper ventilation for breathing, and nature had an answer – the gills on fish. “We can use copper plating to cover some frequently touched surfaces such as doorknobs and elevator buttons that inspired me to see how we could combine what looks like almost a magic metal into a mask design.” Department of Defense, said that a copper alloy can kill 58 percent of infections,” said Zhang, an associate professor in the Department of Mechanical and Energy Engineering. That’s what Jing Zhang of the School of Engineering and Technology at IUPUI and a team of researchers are doing, using a copper coating on 3D-printed plastic filters to create more-efficient masks and respirators. Image courtesy of Jing Zhang, School of Engineering and Technology As the water jet incident angle increases, more vertical velocity component contributes to the kinetic energy which is responsible for the erosion process.In the prototype of the mask’s filter, a ring with V-shape “fins” was designed to increase the surface area where air passes through more channels. The erosion rate increases with the incidence angle, which shows a good agreement with the analytical model. The water jet incident angle dependence can be attributed to the vertical velocity components. The depths of the impact pit holes increase with the water jet incident angle, while the width of the impact holes decreases with the increase in the water jet incident angle. A higher concentration of abrasive particles increases both the width and depth, which is consistent with the experimental data. The deepest points in the pit hole shift gradually to the right when a 30-deg water jet incident angle is used because the water jet comes from the right side, which is more effective in removing the coatings on the right side. Both the width and depth of the impact pit holes increase with impacting time. The results show that the simulated impact hole profiles are in good agreement with the experimental observation in the literature. The Johnson–Holmquist plasticity damage model (JH-2 model) is used for the TBC material, and abrasive particles are included in the water jet model. The effects of water jet abrasive particle concentration, incident angle, and impacting time on the fracture behavior of the TBCs are investigated. In this work, a new smoothed particle hydrodynamics (SPH)-based model is developed to simulate the removal process of thermal barrier coatings (TBCs) using the abrasive water jet (AWJ) technique.
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