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Numerical modeling of aerosol deposition process

Title:

Numerical modeling of aerosol deposition process

Yeganeh, A. Zabihi, Jadidi, M., Moreau, C. and Dolatabadi, Ali ORCID: https://orcid.org/0000-0001-6416-351X (2019) Numerical modeling of aerosol deposition process. Surface and Coatings Technology . ISSN 02578972 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2019.04.094

Abstract

Aerosol Deposition (AD) method is an emerging coating process for deposition of ceramic particles for industrial applications such as MEMS, fuel cells, optical devices and radio frequency components. In this process, various parameters such as nozzle geometry, powder size and type, pressure inside the deposition chamber, and carrier gas flow rate have significant influence on the in-flight particle behavior before impact, and therefore, on the coating properties. In this study, a two-way coupled Eulerian-Lagrangian model is used to study the effects of gas flow rates and substrate location on the gas flow characteristics, bow shock near the substrate, and more importantly on the particle velocity and trajectory upon impact. The study is carried out with a rectangular sonic nozzle. To validate our simulations, locations of the Mach disks in highly under-expanded free-jet conditions are compared with the theoretical and experimental results in the literature. Two different computational geometries are utilized; a 2D planar and a quarter slice of 3D. It is found that, for the rectangular nozzle, the 3D geometry produces more accurate results and can capture the axis-switching phenomenon. Moreover, it is observed that the gas flow structure as well as the in-flight particle behavior obtained from 2D and 3D geometries are almost identical before the Mach disk. In addition, two different drag expressions are employed and it is shown that the influence of Mach and Knudsen numbers on particle behavior in vacuum condition is significant.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Article
Refereed:Yes
Authors:Yeganeh, A. Zabihi and Jadidi, M. and Moreau, C. and Dolatabadi, Ali
Journal or Publication:Surface and Coatings Technology
Date:2 May 2019
Funders:
  • Natural Sciences and Engineering Research Council of Canada (NSERC)
Digital Object Identifier (DOI):10.1016/j.surfcoat.2019.04.094
Keywords:Aerosol deposition; Vacuum; Highly under-expanded jet; In-flight particle behavior; Drag force; Mach disk
ID Code:985398
Deposited By: MICHAEL BIRON
Deposited On:17 May 2019 19:35
Last Modified:17 May 2019 19:35

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