@Article{fdmp.2021.014711,
AUTHOR = {Dongling Yu, Huiling Zhang, Xu Zeng, Dahai Liao, Nanxing Wu},
TITLE = {Influence of Nozzle Orifice Shape on the Atomization Process of Si<sub>3</sub>N<sub>4</sub> in a Dry Granulation Process},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {17},
YEAR = {2021},
NUMBER = {3},
PAGES = {569--586},
URL = {http://www.techscience.com/fdmp/v17n3/42417},
ISSN = {1555-2578},
ABSTRACT = {In order to reveal the intrinsic fluid-dynamic mechanisms of a pressure-swirl nozzle used for Si<sub>3</sub>N<sub>4</sub> dry granulation, and effectively predict its external spray characteristics, the dynamics of air-atomized liquid two-phase flow is analyzed using a VOF (Volume of Fraction) method together with the modified realizable k-ε turbulence model. The influence of nozzle orifice shape on velocity distribution, pressure distribution is studied. The results show that the pressure difference in a convergent conical nozzle is the largest with a hollow air core being formed in the nozzle. The corresponding velocity of atomized liquid at nozzle orifice is the largest. Using a self-designed atomization experiment platform, the velocity and pressure of atomized liquid and the spray cone angle are measured for three nozzles with different orifice shapes. The micro-morphology of Si<sub>3</sub>N<sub>4</sub> particles is also determined. These data confirm the correctness of numerical simulation. Considering atomization performance of the nozzle, the contraction conical nozzle is more suitable for the atomization of Si<sub>3</sub>N<sub>4</sub> in practical production based on the dry granulation approach.},
DOI = {10.32604/fdmp.2021.014711}
}