Heat Transfer Over Serrated Finned Tube CFD Simulation
The simulation is based on the data in the reference article “A characteristic correlation for heat transfer over serrated finned tubes“, and the results are compared and validated with the results in the paper.
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The present problem simulates the cooling process of a finned tube by air flow. The simulation is based on the data in the reference article “A characteristic correlation for heat transfer over serrated finned tubes“, and the results are compared and validated with the results in the paper. In the real model, there is a tube with a certain length, in the direction of which several rows of fins are placed around the tube. So there is a tube with several rows of steel fins in the general model, in this simulation, only part of it is modeled using the symmetric boundary condition.
The open air flow with a temperature of 313.15 K and a velocity according to the defined Reynolds value moves towards the tube fins and performs the heat transfer process. It is assumed that the inner wall of the pipe has a constant temperature boundary condition equal to 473.15 K. The purpose of this work is to investigate the heat transfer process and the cooling rate of the serrated finned tube in different Reynolds numbers, which is determined using the value of the Nusselt number.
Serrated Finned Tube Geometry & Mesh
The current model is designed in three dimensions using Design Modeler software. The model includes a shallow rectangular area as a special area for free air flow around the serrated finned tube. Also, a tube with fins located on its outer wall is defined inside this air flow space, the number of fins of which is 24 and they are drawn smoothly and without angles. Since the model is exactly symmetrical, the modeling is done using symmetry boundary condition.
The meshing of the present model has been done using ANSYS Meshing software. The mesh type is structured and the element number is equal to 356240.
Heat Transfer CFD Simulation
To simulate the present model, several assumptions are considered:
- We perform a pressure-based solver.
- The simulation is steady.
- We ignore the gravity effect.
A summary of the defining steps of the problem and its solution is given in the following table:
|Models (Heat Transfer Over Serrated Finned Tube)
|near wall treatment||enhanced wall functions|
|Boundary conditions (Heat Transfer Over Serrated Finned Tube)
|velocity magnitude||variable (based on Reynolds)|
|wall motion||moving wall|
|gauge pressure||0 Pascal|
|Methods (Heat Transfer Over Serrated Finned Tube)
|momentum||second order upwind|
|energy||second order upwind|
|turbulent kinetic energy||second order upwind|
|turbulent dissipation rate||second order upwind|
|Initialization (Heat Transfer Over Serrated Finned Tube)
|gauge pressure||0 Pascal|
Paper Validation Results (Heat Transfer Over Serrated Finned Tube)
At the end of the simulation process, the value of the Nusselt number on the tube wall was calculated and compared with the values in the diagram in Figure 6 of the article. This comparison of Nusselt number values has been performed in three different Reynolds numbers including 2000, 5000 and 10000.
|Re||Nu (Present)||Nu (Paper)||Error (%)|
(Heat Transfer Over Serrated Finned Tube)
Also, after the completion of the solution process, we obtain two-dimensional contours related to pressure, velocity, and temperature, as well as two-dimensional velocity vectors.
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.