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Sedimentation and Erosion in a Shell and Tube, Ansys Fluent Training

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In this project, sedimentation and erosion in a shell and tube have been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Sedimentation and Erosion Project Description

In this study, using the DPM (Disctere phase material) method, sedimentation and erosion in a shell and tube were investigated by Ansys Fluent software.  The system consists of two different fluids, including oil and water (Water flows in the shell and oil in the tube). Using Ansys Fluent software, the impurity distribution was observed. The software’s different erosion models help correctly predict the erosion effect in other cases according to different working conditions. The velocity inlet of oil and water enters the domain with the speed of 1 m/s with gravity considered as -9.81 m/s-2 on the z-axis.

Geometry&Mesh

The 3-D geometry of the present model is carried out using Design Modeler software. The geometry consists of two-section, 1-shell 2-Tube. The inlet diameters of the shell and tube are 20 cm, and also the outlet diameter for both of shell and tube is 20 cm.

Sedimentation and erosion Sedimentation and erosion

For grid generation, unstructured mesh with 640618 elements in the Ansys Meshing Software was utilized. To focus on grid-sensitive areas, we used the curvature method. The following figure shows the mesh generation for this problem.

Sedimentation and erosionSedimentation and erosion

CFD Simulation

To simulate the sedimentation and erosion in a shell and tube, several assumptions are considered, which are:

  • The solver is pressure-based.
  • This simulation has been done as steady-state
  • The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the z-axis in the present model.

The following is a summary of the steps for defining the problem and its solution

Models
`Energy on
Turbulence models
K-  viscous model
RNG K- model
Standard wall Function Wall function
Discrete phase model (DPM)
Physical model Erosion/Accretion

Generic model

Finnie

oka

Injection type: Surface velocity inlet
Diameter Distribution: Rosin-rammler
Min. Diameter: 1e-5m
Max.Diameter: 0.001m
Mean. Diameter: 0.0001m
Total flow rate: 0.00273825kg/s
Material Properties
oil
Amount Fluid properties
870 Density (kg/m3)
1000.97 Specific Heat (Cp) [J/(kg K)]
0.152 Thermal Conductivity [W/(m K)]
0.00072 Viscosity (kg/m.s)
water
Amount Fluid properties
998.2 Density (kg/m3)
4182 Specific Heat (Cp) [J/(kg K)]
0.6 Thermal Conductivity [W/(m K)]
0.001003 Viscosity (kg/m.s)
Inert-particle (impurities)
Amount Fluid properties
1600 Density (kg/m3)
830 Specific Heat (Cp) [J/(kg K)]
Boundary Condition
name Type Amount (units)
Inlet Tube Velocity inlet 1m/s

Temperature=900k

DPM= escape

Inlet Shell Velocity inlet 1m/s

Temperature=400k

DPM= escape

Outlet Tube Pressure outlet 0 pa

DPM= escape

Outlet Shell Pressure outlet 0 pa

DPM= escape

Wall shell wall stationary wall

No-slip

DPM=reflect

Wall- tube-shell-tube wall stationary wall

No-slip

DPM=reflect

Wall- Tube -Tube Wall stationary wall

No-slip

DPM=reflect

Interior-shell interior
Interior-Tube interior
Cell zone condition
shell oil
Tube water
Solution methods
Coupled pressure velocity coupling
Second-order pressure spatial discretization
Second-order upwind momentum
First-order upwind turbulent kinetic energy
First-order upwind      turbulent dissipation rate
Second-order upwind Energy
Initialize standard

Sedimentation and Erosion Results

At the end of the solution process, outlet temperature, velocity, pressure, and erosion for the sedimentation and erosion simulation in a shell and tube are obtained. We see the amount of sand deposition in the shell. Erosion models are first examined. In model Finnie, which, like Oka and Mclaury models, uses an empirical correlation to predict erosion, it is used primarily for malleable materials in which the Collision angle and velocity are effective. The model Oka considers the effect of wall hardness and may be more suitable for investigating the erosion of transmission pipes. Model Mclaury is used to study suspended solids in water and was ideal for the present case.

zone The temperature of the inlet(k) The temperature of the outlet(k)
Tube 900 776
shell 400 414.28
zone oka [kg/m^2] McLaury [kg/m^2]
Tube 2.452726e-10 3.028e-08
shell 4.9492331e-09 6.43e-07

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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