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Heat Transfer Over Serrated Finned Tube CFD Simulation

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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.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Paper Description

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.

heat transfer

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.

heat transfer

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

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)
Viscous k-epsilon
k-epsilon model RNG
near wall treatment enhanced wall functions
Energy On
Boundary conditions (Heat Transfer Over Serrated Finned Tube)
Inlet Velocity Inlet
velocity magnitude variable (based on Reynolds)
temperature 313.15 K
Heat Wall Wall
wall motion moving wall
temperature 473.15 K
Outlet Pressure Outlet
gauge pressure 0 Pascal
Methods (Heat Transfer Over Serrated Finned Tube)
Pressure-Velocity Coupling SIMPLE
Pressure second order
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)
Initialization methods Standard
gauge pressure 0 Pascal
temperature 313.15 K
x-velocity variable

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 (%)
2000 9.20664 8.5 7.675333
5000 16.79145 19 13.15283
10000 26.31589 28.5 8.299582
Net 9.709249

(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.

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