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Serrated Finned Tubes Heat Transfer CFD Simulation

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The present product is going to simulate airflow over a serrated fin and compare the results of numerical work (CFD) with the results of the paper.

 

This product includes CFD simulation files and a training movie using ANSYS Fluent software.

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Description

Problem Description for Heat Transfer Over Serrated Finned Tubes CFD Simulation

The present product is going to simulate a cool airflow over a serrated fin and compare the results of numerical work (CFD) with the results of the paper entitled: “A characteristic correlation for heat transfer over serrated finned tubes.”

The Assumption for Heat Transfer Over Serrated Finned Tubes CFD Simulation

There are several assumptions used to simulate the present problem:

The solver is based on a pressure-based perspective.
The simulation is Steady-State.
The turbulence flow is considered.
The effect of Earth’s gravity has been ignored.

Geometry & Mesh

The pipe and blade model was first designed in SOLIDWORKS software and later imported into the ANSYS Design Modeler software. After the changes were made, the model was ready to have been meshed. The grid used in the fin areas as well as between them is structured and in other areas it is unstructured. The total number of elements used is 356240.

Heat Transfer Over Serrated Finned Tubes CFD Simulation

Summaries of the problem definition and problem-solving steps are presented in the following table:

Models
k-epsilon Viscous model
RNG k-epsilon model
Enhanced Wall Treatment Near wall treatment
on Energy
Boundary conditions (Heat Transfer over Serrated Finned Tubes)
Velocity inlet Inlet type
1.825918367347 m/s Inlet velocity (Heat Transfer over Serrated Finned Tubes)
1% Turbulent Intensity
10 Turbulent Viscosity Ratio
313.15 K total temperature
Pressure outlet Outlet type
0 Pa gauge pressure
1% backflow Turb. Int.
10 backflow Turb. Vis. Ratio
313.15 K backflow total temperature
wall Walls type
473.15 K Const. temperature for walls
0 W.m-2 heat flux for walls
Solution Methods (Heat Transfer over Serrated Finned Tubes)
Simple   Pressure-velocity coupling
Second Order pressure Spatial discretization
Second order upwind momentum
Second order upwind energy
Second order upwind turbulent kinetic energy
Second order upwind turbulent dissipation rate
Initialization (Heat Transfer over Serrated Finned Tubes)
Standard Initialization method
1.825918 m/s X- velocity
0.0005000967 Turb. Kinetic energy
0.0001446749 Turb. Dissipation rate
300 K temperature

Boundary Condition (Heat Transfer over Serrated Finned Tubes)

Inlet

At the inlet of this pipe, air enters with a constant velocity of 1.83m/s and a temperature of 313.15K.

Wall

The condition assumed, according to the paper, is a constant temperature condition of 473.15K.

Symmetry

According to the model, the symmetric boundary condition for geometry is taken into account.

Outlet

The condition applied in this section is the pressure outlet.

Reference Value

Since in this case, the fluid and thermal parameters after passing through the blades are compared with the fluid and thermal parameters at the inlet of the solution domain, so the reference value values should be considered the same as the pipe inlet values.

Results of Heat Transfer Over Serrated Finned Tubes CFD Simulation

After the dissolution process is completed, two-dimensional temperature contours are obtained for 3 different Reynolds. In the following, the Nu graph in different Re numbers is given by comparing the graphs obtained from numerical (CFD) and experimental work to verify the accuracy of the numbers reported in the present project.

heat transfer

The error in all three Reynolds is given in the table below, with a total error of less than 10%.

Re Nu(Present) Nu(Paper) Error (%)
2000 9.20664 8.5 7.675333
5000 16.79145 19 13.15283
10000 26.31589 28.5 8.299582
Net 9.709249

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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