Numerical simulation of the dip-coating process with wall effects on the coating film thickness

2015 ◽  
Vol 12 (5) ◽  
pp. 843-853 ◽  
Author(s):  
Mahyar Javidi ◽  
Andrew N. Hrymak
Keyword(s):  
Numerical Simulation ◽  
Film Thickness ◽  
Dip Coating ◽  
Coating Process ◽  
Coating Film ◽  
Wall Effects

scholarly journals Research on Distribution Properties of Coating Film Thickness from Air Spraying Gun-Based on Numerical Simulation

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 721 ◽  
Author(s):  
Xiaopeng Xie ◽  
Yinan Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Film Thickness ◽  
Coating Thickness ◽  
Thickness Distribution ◽  
Air Pressure ◽  
Reasonable Assumption ◽  
Coating Film ◽  
Discrete Phase Model ◽  
Spraying Process

This work aims to study the influence of the spraying parameters on the spray flow field and coating thickness distribution during the air spraying process. The shaping air pressure and the target geometry have an important influence on the distribution of coating film thickness. This paper begins with a 3-D physical model of an air spray gun, in which unstructured grids were generated for control domain. A grid independency study was also carried out to determine the optimal number of cells for the simulations. Then the Euler–Lagrange method was used to describe the two-phase spray flow by establishing a paint deposition model. The numerical simulation based on the discrete phase model (DPM) and TAB model has been carried out. A reasonable assumption was proposed based on the analysis of the spraying process, so that the droplets were injected into the airflow at the position of the paint hole. The influence of the shaping air pressure on the air flow field and the coating thickness distribution was analyzed by changing the shaping air pressure. From the numerical simulation results, it can be concluded that the smaller the shaping air pressure, the more concentrated the coating. With increasing the shaping air pressure, the length of the coating film along z-axis gradually increases, the width along x-axis gradually decreases, and the spray area gradually increases. The paper ends with a numerical simulation and experimental study on planar vertical spraying, planar tilted spraying, and cylinder spraying. Comparisons and experiment results verify the validity and practicability of the model built in this paper.

scholarly journals SnO2Nanoparticle-Based Passive Capacitive Sensor for Ethylene Detection

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Mangilal Agarwal ◽  
Mercyma D. Balachandran ◽  
Sudhir Shrestha ◽  
Kody Varahramyan
Keyword(s):  
Particle Size ◽  
Film Thickness ◽  
Recovery Time ◽  
Room Temperature ◽  
Capacitive Sensor ◽  
Dip Coating ◽  
Coating Process ◽  
Gas Concentration ◽  
Pd Alloy ◽  
Nanoscale Particle Size

A passive capacitor-based ethylene sensor using SnO2nanoparticles is presented for the detection of ethylene gas. The nanoscale particle size (10 nm to 15 nm) and film thickness (1300 nm) of the sensing dielectric layer in the capacitor model aid in sensing ethylene at room temperature and eliminate the need for microhotplates used in existing bulk SnO2-resistive sensors. The SnO2-sensing layer is deposited using room temperature dip coating process on flexible polyimide substrates with copper as the top and bottom plates of the capacitor. The capacitive sensor fabricated with SnO2nanoparticles as the dielectric showed a total decrease in capacitance of 5 pF when ethylene gas concentration was increased from 0 to 100 ppm. A 7 pF decrease in capacitance was achieved by introducing a 10 nm layer of platinum (Pt) and palladium (Pd) alloy deposited on the SnO2layer. This also improved the response time by 40%, recovery time by 28%, and selectivity of the sensor to ethylene mixed in a CO2gas environment by 66%.

scholarly journals The Effect of Film Thickness and Content on Film Formation from PS/ Nanocomposites Prepared by Dip-Coating Method

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
M. Selin Sunay ◽  
Onder Pekcan ◽  
Saziye Ugur
Keyword(s):  
Film Thickness ◽  
Elevated Temperatures ◽  
Film Formation ◽  
Fluorescence Emission ◽  
Dip Coating ◽  
Atomic Force ◽  
Annealing Step ◽  
Coating Method ◽  
Fluorescence Emission Intensity ◽  
Dip Coating Method

Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique and atomic force microscope (AFM) was used for studying film formation from TiO2covered nanosized polystyrene (PS) latex particles (320 nm). The effects of film thickness and TiO2content on the film formation and structure properties of PS/TiO2composites were studied. For this purpose, two different sets of PS films with thicknesses of 5 and 20 μm were prepared from pyrene-(P-) labeled PS particles and covered with various layers of TiO2using dip-coating method. These films were then annealed at elevated temperatures above glass transition temperature () of PS in the range of 100–280°C. Fluorescence emission intensity, from P and transmitted light intensity, were measured after each annealing step to monitor the stages of film formation. The results showed that film formation from PS latexes occurs on the top surface of PS/TiO2composites and thus developed independent of TiO2content for both film sets. But the surface morphology of the films was found to vary with both TiO2content and film thickness. After removal of PS, thin films provide a quite ordered porous structure while thick films showed nonporous structure.

Electrochemical characterization of YSZ thick films deposited by dip-coating process

2007 ◽  
Vol 171 (2) ◽  
pp. 783-788 ◽  
Author(s):  
F. Mauvy ◽  
P. Lenormand ◽  
C. Lalanne ◽  
F. Ansart ◽  
J.M. Bassat ◽  
...  
Keyword(s):  
Thick Films ◽  
Dip Coating ◽  
Electrochemical Characterization ◽  
Coating Process

Microstructural characterisation by X-ray scattering of perovskite-type La0.8Sr0.2MnO3±δ thin films prepared by a dip-coating process

2007 ◽  
Vol 42 (12) ◽  
pp. 4581-4590 ◽  
Author(s):  
P. Lenormand ◽  
A. Lecomte ◽  
C. Laberty-Robert ◽  
F. Ansart ◽  
A. Boulle
Keyword(s):  
Thin Films ◽  
Dip Coating ◽  
Coating Process ◽  
X Ray ◽  
X Ray Scattering ◽  
Microstructural Characterisation ◽  
Perovskite Type ◽  
Ray Scattering

Numerical simulation of the liquid phase in SnO2 thin film deposition by sol-gel-dip-coating

2010 ◽  
Vol 55 (3) ◽  
pp. 385-393 ◽  
Author(s):  
Dayene M. Carvalho ◽  
Jorge L. B. Maciel ◽  
Leandro P. Ravaro ◽  
Rogério E. Garcia ◽  
Valdemir G. Ferreira ◽  
...  
Keyword(s):  
Thin Film ◽  
Numerical Simulation ◽  
Liquid Phase ◽  
Sol Gel ◽  
Thin Film Deposition ◽  
Dip Coating ◽  
Film Deposition ◽  
Sno2 Thin Film
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