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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 28 9:00 AM
Modeling & Simulation I
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| Title: |
Numerical study of suspension HVOF spray and particle behavior near flat substrates
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| Authors: |
Mehdi Jadidi / Concordia University, Canada
Ali Dolatabadi* / Concordia University, Canada
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| Abstract: |
It is proved that substrate location and shape, as well as particle in-flight behavior have significant influences on the coatings quality in thermal spray processes. In the current study, the suspension high-velocity oxygen-fuel (HVOF) spraying process is simulated using a three-dimensional two-way coupled Eulerian-Lagrangian approach. Flat substrates are located at different standoff distances in the domain and particles behavior near substrates and upon impact are analyzed. Suspension is a combination of mullite solid powder (3Al2O3·2SiO2), ethanol, and ethylene glycol. Suspension droplets are injected into the combustion chamber and Taylor Analogy Breakup model is used to simulate the droplet breakup. The premixed combustion of oxygen-propylene, and non-premixed combustion of oxygen-ethanol and oxygen-ethylene glycol are simulated using the eddy dissipation model. In addition, the realizable k-µ turbulence model is applied to simulate the gas phase. After the completion of breakup and combustion phenomena, the solid particles are tracked through the computational domain. It is revealed that the particle velocity and temperature decrease as the standoff distance increases. This numerical prediction is consistent with the experimental results in the literature for the same operating conditions.
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