Serrated Finned Tubes Heat Transfer CFD Simulation
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.
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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:
|Enhanced Wall Treatment||Near wall treatment|
|Boundary conditions (Heat Transfer over Serrated Finned Tubes)|
|Velocity inlet||Inlet type|
|1.825918367347 m/s||Inlet velocity||(Heat Transfer over Serrated Finned Tubes)|
|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|
|473.15 K||Const. temperature for walls|
|0 W.m-2||heat flux for walls|
|Solution Methods (Heat Transfer over Serrated Finned Tubes)|
|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)|
|1.825918 m/s||X- velocity|
|0.0005000967||Turb. Kinetic energy|
|0.0001446749||Turb. Dissipation rate|
Boundary Condition (Heat Transfer over Serrated Finned Tubes)
At the inlet of this pipe, air enters with a constant velocity of 1.83m/s and a temperature of 313.15K.
The condition assumed, according to the paper, is a constant temperature condition of 473.15K.
According to the model, the symmetric boundary condition for geometry is taken into account.
The condition applied in this section is the pressure outlet.
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.
The error in all three Reynolds is given in the table below, with a total error of less than 10%.
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.