Browsing by Author "Alhaleeb, Mustafi"
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Item MODELING AND OPTIMIZATION OF NANOPARTICLE PRODUCTION BY FLAME SPRAY PYROLYSIS METHOD(2022-01-14) Alhaleeb, Mustafi; Machin, Nesrin E.In this thesis, a computational fluid dynamics (CFD) model is applied to simulate the flame spray pyrolysis (FSP) process for the continuous production of nanoparticles by using Fluent V.19 (ANSYS) software and MATLAB sequentially. The model is developed and validated using the experimental data available in the literature, and later applied to design a laboratory scale FSP system. Improvement on the applied CFD model was attempted by using the shear stress transport (SST) k-ω as a turbulence model instead of the realizable k-ε model. The outcome of this attempt was to reduce the error in the primary particle size predictions from 20% to 8%. Furthermore, using an implicit pressure velocity coupling as a numerical solver shortened the computational time by 96%. The impact of nanoparticles on the flame gas temperature was taken into account, and an approach was developed to include the radiation heat losses from the flame to nanoparticles. By applying this approach, the average error in the gas temperature prediction was reduced from 24% to 7%, thus lead to the prediction of the primary particle diameters with a 92% accuracy. Moreover, a number of parametric studies were conducted to help better understand the control of the TiO2 nanoparticle sizes produced in the new FSP system. The modeling validated results showed that, gas-to-liquid-mass ratio (GLMR), energy input into the flame, dispersion gas pressure drop across the nozzle tip, cooling rate and the particle residence time are the most important operational parameters which need to be kept within a certain range to control the final nanoparticle properties.