Numerical simulations of ultrafine powder coating systems

Li, Z.; Zhu, Jesse; Zhang, C.

doi:10.1016/j.powtec.2005.01.005

Cited by 23 publications

(13 citation statements)

References 9 publications

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“…The effects of those main parameters are summarized in a comprehensive equation obtained through nonlinear regression of the simulated results for the estimation of particle velocity. Li et al [17] conducted numerical simulations for gas-solid two-phase flows for an experimental coating of an industrial booth to study the effect of the coating powder size on the performance of the coating process. In order to increase the coating process efficiency and coating quality, different coating parameters, such as the size of the coating part, the distance between the coating part and the spray gun, the air flow rate and particle flow rate from the spray gun, the position of the pattern adjust sleeve of the spray gun, and the electrostatic field were accounted for in their simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on cold gas dynamic spray process with nano- and microsize particles

Jen

Cui

et al. 2005

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Numerical investigations on cold gas dynamic spray process with nano- and microsize particles

Jen

Cui

et al. 2005

International Journal of Heat and Mass Transfer

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“…On the other hand, Barmuta et al [18] observed that the substrate tends to collect small particles, and they attributed this phenomenon to the effect of electroseparation during powder coating processes. Many other earlier studies [19][20][21][22][23][24][25][26] widely investigated particle behaviors in charging and deposition efficiency. Unfortunately, few were conducted to examine the size evolution in the deposited layer during powder coating processes.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Characterization of particle size evolution of the deposited layer during electrostatic powder coating processes

2009

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“…, respectively. The suction pressure is set at -100 Pa (gage) to maintain an inward airfl ow into the booth through the three doors at a minimum velocity of 0.61 m/s, so that no particle escapes from the coating booth (Li, 2003). A fi lter chamber (not shown in Figure 1) is installed on the top of the booth to collect particles leaving from the suction holes.…”

Section: Configuration Of the Powder Coating Booth And The Spray Gunmentioning

confidence: 99%

“…In the previous work by Li et al (2005), the numerical procedure for the simulation of the complete powder coating process in actual coating systems was presented.…”

mentioning

confidence: 99%

“…However, due to the complex geometry of the powder spray gun and the fl ow pattern of the air fl ow and particle movement inside the coating booth, no article can be found in the literature in which the whole process of the powder coating system was simulated for an actual coating booth. In the previous work by Li et al (2005), the numerical procedure for the simulation of the complete powder coating process in actual coating systems was presented.…”

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confidence: 99%

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Numerical Study of the Effect of Particle Size on the Coating Efficiency and Uniformity of an Electrostatic Powder Coating Process

Li¹,

Zhang²,

Zhu³

2008

Can. J. Chem. Eng.

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C ompared to the traditional liquid coating technology, powder coating eliminates the problem associated with solvent emission, reduces the extra cost of solvent and allows easy recycle of over sprayed powder. It is a more environmentally friendly and also more economical process. Traditionally, powder coating has been mainly applied to parts where the surface fi nish quality is not critical, so that relatively larger (35 to 60µm) powders can be used. This is because smaller powders tend to agglomerate and lead to fl ow problems. In the past decade, however, there have been strong efforts to apply powder coating to new markets where powder coating has not been typically used-such as automotive clear top coatings, can and coil coatings, and coatings on high-end products (Misev and van der Linde, 1998). To ensure the quality of coating fi nish, fi ner powders must be used to avoid obvious orange feel on the coating surface. Finer particles, if applied properly, can produce much more uniform coatings that results in superb coating fi nish that cannot be achieved by regular-sized (35 to 60 µm) coating powder (Zhu and Zhang, 2004).As charged particles are conveyed out from a powder spray gun by air, particle trajectories are governed by aerodynamic This paper reports on a research project that studies the effect of particle size on the coating effi ciency and coating uniformity in a powder coating system using the computational fl uid dynamics as a modelling tool. The numerical simulations are conducted for different particle sizes with different distances between the spray gun and the coating part and different positions of the powder spray gun pattern adjuster sleeve (PAS). This study can provide detailed information on air fl ow pattern and particle trajectories inside the powder coating booth, and the coating fi lm thickness on the coated part as well as the particle transfer effi ciency (PTE). In numerical simulations, the air fl ow fi eld is obtained by solving three-dimensional Navier-Stokes equations with standard κ-ε turbulence model and non-equilibrium wall function. The second phase, the coating powder, consists of spherical particles that are dispersed in the continuous phase, the air. In addition to solving transport equations for the air, the trajectories of the particles are calculated by solving the particle motion equations using the Lagrangian method. It is assumed that particle-particle interaction can be neglected. The electrostatic fi eld is modelled by solving the Laplace equation.On a étudié l'effet de la taille des particules sur l'effi cacité et l'uniformité de l'enrobage dans un système d'enduction de poudre à l'aide de la simulation numérique des écoulements. Les simulations numériques sont effectuées pour différentes tailles de particules et différentes distances entre le dispositif d'atomisation et la région d'enduction, ainsi que différentes positions du dispositif de contrôle du mode d'atomisation (PAS). Cette étude fournit des informations précises sur le mode d'écoulement de l'air et l...

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Numerical simulations of ultrafine powder coating systems

Cited by 23 publications

References 9 publications

Numerical investigations on cold gas dynamic spray process with nano- and microsize particles

Numerical investigations on cold gas dynamic spray process with nano- and microsize particles

Characterization of particle size evolution of the deposited layer during electrostatic powder coating processes

Numerical Study of the Effect of Particle Size on the Coating Efficiency and Uniformity of an Electrostatic Powder Coating Process

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