2004
DOI: 10.1007/s11663-004-0072-y
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A numerical study of oxidation behavior during reactive atomization and deposition

Abstract: The oxidation behavior of droplets during reactive atomization and deposition (RAD) is analyzed on the basis of a numerical framework proposed here. Commercial 5083 Al is chosen as a model material; moreover, in the numerical model, nonspherical droplets are approximated as cylinders with a length/diameter ratio of 3. An equation that represents the growth rate of the oxide phases, together with models that describe the dynamic and thermal behavior of droplets, is implemented in an effort to elucidate the oxid… Show more

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Cited by 7 publications
(11 citation statements)
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“…The velocity of atomized droplets increases with increasing gas pressure. [46] q m 3545 kgm À3 [ 47] c m 0.914-3.5 9 10 À4 (T-911) Jm À2 [ 46] q 0.517 - [46] j 0.316 - [46] C M 0.2165 - [46] e 0.035 - [48] T g 464 K [47] T m 916 K [47] T 0 300 K Fig. 1-Velocity variation of gas and droplets (20 lm) under different gas pressures.…”
Section: Modeling Results and Analysismentioning
confidence: 99%
“…The velocity of atomized droplets increases with increasing gas pressure. [46] q m 3545 kgm À3 [ 47] c m 0.914-3.5 9 10 À4 (T-911) Jm À2 [ 46] q 0.517 - [46] j 0.316 - [46] C M 0.2165 - [46] e 0.035 - [48] T g 464 K [47] T m 916 K [47] T 0 300 K Fig. 1-Velocity variation of gas and droplets (20 lm) under different gas pressures.…”
Section: Modeling Results and Analysismentioning
confidence: 99%
“…Furthermore, the surfaces of oxidized droplets are always irregular. [26,27] These two factors cause a high frictional resistance between an incoming droplet and the deposited material's surface during spreading and flattening of the droplet. Second, the surrounding droplets exert a resistance to spreading and flattening of the droplet.…”
Section: A Impingement and Flattening Of Dropletsmentioning
confidence: 99%
“…During flight, the temperature and the solid fraction of a droplet can be calculated using the equation of energy conservation containing the contribution of oxidation reactions. [30] The oxidation behavior of the droplet is analyzed in detail in Reference 30. In the flight stage, thermal energy of a droplet is extracted by convection and radiation heat transfer between the droplet and the atomization gas.…”
Section: Numerical Modelingmentioning
confidence: 99%
“…[16,21,[35][36][37][38] Droplet size is represented using the diameter for a spherical SDN droplet and using the effective diameter on the basis of volume for a nonspherical RAD droplet (defined as the diameter of a spherical droplet with a volume equivalent to that of the nonspherical droplet). [30] There are two characteristic values in a lognormal distribution of droplet size: the mass median diameter (d 50 ) and the geometric standard deviation ( g ). The d 50 (d i defined as a droplet size below which the cumulative mass or volume percent is i) can be predicted by using a correlation originally developed by Lubanska, [35] which is closely related to the atomization gas velocity during interaction between gas jets and the melt stream and the ratio of the gas flow rate to the metal flow rate.…”
Section: Numerical Modelingmentioning
confidence: 99%
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