scholarly journals NUMERICAL SIMULATION OF DROPLET IMPACT AND SOLIDIFICATION INCLUDING THERMAL SHRINKAGE IN A THERMAL SPRAY PROCESS

2011 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohammad Passandideh-Fard ◽  
Sina Alavi
Keyword(s):  
Numerical Simulation ◽  
Thermal Spray ◽  
Droplet Impact ◽  
Thermal Shrinkage ◽  
Thermal Spray Process ◽  
Spray Process

Droplet Impact and Solidification in a Thermal Spray Process: Droplet-Substrate Interactions

1996 ◽  
Author(s):  
M. Pasandideh-Fard ◽  
J. Mostaghimi
Keyword(s):  
Numerical Solution ◽  
Thermal Spray ◽  
Stokes Equations ◽  
Thermal Contact ◽  
Droplet Impact ◽  
Substrate Interactions ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Rectangular Mesh ◽  
The Impact

Abstract Experiments have shown that the mechanical properties of plasma-sprayed coatings depend to a large extent on the details of the spraying process, in particular, they are strongly dependent on the details of the solidification and deformation history of the individual droplets which are in turn highly affected by the substrate conditions such as its temperature, material, and surface thermal contact resistance. In this study, droplet-substrate interactions are investigated through a complete numerical solution of droplet impact and solidification for a typical thermal spray process. The energy equation is numerically solved for both droplet and substrate regions; the solution is based on the Enthalpy Method for the liquid and solidified parts of the droplet, and the conduction heat transfer in the substrate. The numerical solution for the complete Navier-Stokes equations is based on the modified SOLA-VOF method using rectangular mesh in axisymmetric geometry. The developed model is suited for investigating droplet impact and simultaneous solidification permitting any desired condition at the substrate. The splat shape, the solidification front, and the temperature profile in the entire droplet and substrate regions are obtained at any desired time elapsed after the impact. Through these results, the nucleation and growth of solidification and droplet-substrate interactions are extensively studied.

Numerical Simulation of Droplet Impact and Solidification Including Thermal Shrinkage in a Thermal Spray Process

2010 ◽  
Author(s):  
Sina Alavi ◽  
Mohammad Passandideh-Fard
Keyword(s):  
Thermal Spray ◽  
Stokes Equations ◽  
Numerical Study ◽  
Steel Substrate ◽  
Vof Method ◽  
Thermal Shrinkage ◽  
Navier Stokes ◽  
Molten Metals ◽  
Thermal Spray Process ◽  
Spray Process

In this paper, we performed a numerical study on the effects of thermal shrinkage on deposition of molten tin and nickel droplets on a steel substrate in thermal spray processes using Volume-of-Fluid (VOF) method. Thermal shrinkage is a phenomenon caused by variation of density during solidification and cooling of molten metals. In our model, the Navier-Stokes equations along with energy equation including phase change are solved using a 2-D axisymmetric mesh. We used the VOF method to track the free surface of droplet. For solidification, we used an enthalpy-porosity formulation. The simulations performed in this study are accomplished using a commercial code (Fluent). Results of these scenarios are presented: the normal impacts of 2.7mm tin droplets at 1m/s and 2m/s, initially at 240°C, onto a 27°C steel substrate. When the droplet impacts the substrate with a velocity of 1m/s, the final splat has a single cavity inside due to shrinkage. In other cases with the scales of a typical thermal spray process, the results of normal impact of nickel droplets with a velocity of 73m/s, initial temperature 1600°C and diameter 60μm to steel substrate with different temperatures are presented. In these cases shrinkage decreases the droplet splashing on the substrate.

Lead-Free Piezoelectric Ceramic Coatings Fabricated by Thermal Spray Process

2017 ◽  
Vol 64 (11) ◽  
pp. 1758-1765 ◽  
Author(s):  
Kui Yao ◽  
Shuting Chen ◽  
Kun Guo ◽  
Chee Kiang Ivan Tan ◽  
Meysam Sharifzadeh Mirshekarloo ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Piezoelectric Ceramic ◽  
Ceramic Coatings ◽  
Lead Free ◽  
Thermal Spray Process ◽  
Spray Process

Coating Bores of Light Metal Engine Blocks with a Nanocomposite Material using the Plasma Transferred Wire Arc Thermal Spray Process

2008 ◽  
Vol 17 (3) ◽  
pp. 344-351 ◽  
Author(s):  
K. Bobzin ◽  
F. Ernst ◽  
J. Zwick ◽  
T. Schlaefer ◽  
D. Cook ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Light Metal ◽  
Nanocomposite Material ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Engine Blocks

A Splats Obtaining System for Thermal Spray Deposits

2007 ◽  
Vol 561-565 ◽  
pp. 1169-1172 ◽  
Author(s):  
W.T. Hsiao ◽  
W.H. Liao ◽  
M.S. Leu ◽  
Cherng Yuh Su
Keyword(s):  
Thermal Spray ◽  
High Velocity ◽  
Glass Substrate ◽  
Single Spot ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Hvof Process

The image of thermal spray splats is difficult to collect due to its high velocity of droplets. Especial in High Velocity Oxy-Fuel (HVOF) process, the process present higher velocity of flame jet correlated to other thermal spray process. The system presents at this article describes a useful splats catching method to obtaining splats during thermal spray deposited. Capabilities and advantages of using this instrument are declared at this theme. The final result presented the instrument caught the single spot of HVOF sprayed splats at sub-micro second. Splats of spot were dispersed well on the glass substrate at the obtaining system, and presented various information of droplets impact at different location on the substrate.

scholarly journals Fabrication and Evaluation of NOx Elimination Coating Photocatalyst by Thermal Spray Process.

2001 ◽  
Vol 19 (3) ◽  
pp. 570-576
Author(s):  
Masahiro FUKUMOTO ◽  
Hiroyuki MURAYAMA ◽  
Young-gyo Jung
Keyword(s):  
Thermal Spray ◽  
Thermal Spray Process ◽  
Spray Process
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