The Effects of Thermal Shrinkage on Coating Formation in Thermal Spray Processes: A Numerical Approach
سال
: 2010
چکیده: In this paper, we performed a numerical study on the
effects of thermal shrinkage on the deposition of
molten tin droplets on a steel substrate in thermal spray
coating process using Volume-of-Fluid (VOF) method.
Thermal shrinkage is a phenomenon caused by
variation of density during solidification and cooling
down of molten metal. The Navier-Stokes equations
along with the energy equation including phase change
are solved using a 2-D axisymmetric mesh. We used
the VOF method, applied to the fixed Eulerian mesh, to
track the free surface of the droplet. For solidification,
we used an enthalpy-porosity formulation. The
simulations performed in this study are accomplished
using both a commercial code (FLUENT) and an inhouse
developed program. The results of these
scenarios are presented: the normal impacts of 2.7mm
spherical tin droplets at 1m/s and 2m/s, initially at
240°C, onto a 27°C steel substrate. It is seen that when
the droplet impacts to the substrate with 1m/s velocity,
it spreads and solidifies and during the recoil of the
droplet, a single cavity forms within the splat which is
the source of porosity and is caused by shrinkage.
effects of thermal shrinkage on the deposition of
molten tin droplets on a steel substrate in thermal spray
coating process using Volume-of-Fluid (VOF) method.
Thermal shrinkage is a phenomenon caused by
variation of density during solidification and cooling
down of molten metal. The Navier-Stokes equations
along with the energy equation including phase change
are solved using a 2-D axisymmetric mesh. We used
the VOF method, applied to the fixed Eulerian mesh, to
track the free surface of the droplet. For solidification,
we used an enthalpy-porosity formulation. The
simulations performed in this study are accomplished
using both a commercial code (FLUENT) and an inhouse
developed program. The results of these
scenarios are presented: the normal impacts of 2.7mm
spherical tin droplets at 1m/s and 2m/s, initially at
240°C, onto a 27°C steel substrate. It is seen that when
the droplet impacts to the substrate with 1m/s velocity,
it spreads and solidifies and during the recoil of the
droplet, a single cavity forms within the splat which is
the source of porosity and is caused by shrinkage.
کلیدواژه(گان): thermal shrinkage,thermal spray coating,VOF method,solidification,droplets
کالکشن
:
-
آمار بازدید
The Effects of Thermal Shrinkage on Coating Formation in Thermal Spray Processes: A Numerical Approach
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| contributor author | سیدسینا علوی | en |
| contributor author | محمد پسندیده فرد | en |
| contributor author | Seyyed Sina Alavi | fa |
| contributor author | Mohammad Passandideh-Fard | fa |
| date accessioned | 2020-06-06T13:59:13Z | |
| date available | 2020-06-06T13:59:13Z | |
| date copyright | 5/11/2010 | |
| date issued | 2010 | |
| identifier uri | https://libsearch.um.ac.ir:443/fum/handle/fum/3377632 | |
| description abstract | In this paper, we performed a numerical study on the effects of thermal shrinkage on the deposition of molten tin droplets on a steel substrate in thermal spray coating process using Volume-of-Fluid (VOF) method. Thermal shrinkage is a phenomenon caused by variation of density during solidification and cooling down of molten metal. The Navier-Stokes equations along with the energy equation including phase change are solved using a 2-D axisymmetric mesh. We used the VOF method, applied to the fixed Eulerian mesh, to track the free surface of the droplet. For solidification, we used an enthalpy-porosity formulation. The simulations performed in this study are accomplished using both a commercial code (FLUENT) and an inhouse developed program. The results of these scenarios are presented: the normal impacts of 2.7mm spherical tin droplets at 1m/s and 2m/s, initially at 240°C, onto a 27°C steel substrate. It is seen that when the droplet impacts to the substrate with 1m/s velocity, it spreads and solidifies and during the recoil of the droplet, a single cavity forms within the splat which is the source of porosity and is caused by shrinkage. | en |
| language | English | |
| title | The Effects of Thermal Shrinkage on Coating Formation in Thermal Spray Processes: A Numerical Approach | en |
| type | Conference Paper | |
| contenttype | External Fulltext | |
| subject keywords | thermal shrinkage | en |
| subject keywords | thermal spray coating | en |
| subject keywords | VOF method | en |
| subject keywords | solidification | en |
| subject keywords | droplets | en |
| identifier link | https://profdoc.um.ac.ir/paper-abstract-1018148.html | |
| conference title | ISME2010 | en |
| conference location | Tehran | fa |
| identifier articleid | 1018148 |