Simulation of fin-tube heat exchanger in Ansys Fluent

FIN TUBE is a blade tube which is used for increasing the surface to a wider level (about 20 to 30 times) for better heat transferring. Therefore the volume of the converters, as well as the cost Economic and process efficiency, are greatly increased. These tubes not only by reducing energy consumption improve the heat transfer but also they prevent sedimentation and internal fluid movement. This idea leads to an increase transmission velocity and ultimately reduce heat in the shortest time.

In this analysis, it has been tried to simulate the fluid flow on the tube Fin heat exchanger. Also, heat transfer on this geometry has been analyzed by Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis is designed in Ansys Design Modeler software. This geometry contains a section of the heat exchanger. Since a heat exchanger is usually symmetrical, so it has been tried to use this property, and instead of solving the total flow of the converter, only a part of the heat exchanger is done.

Meshing is also required in Ansys Meshing software. At the beginning of the domain as well as the end of the domain, the type of meshing is structural. For the rest of the domain, unstructured meshing is used. The total number of cells is 417318.

Model

Due to the fact that in this analysis the shear stress of fluid movement on the surfaces is very important, the K-omega SST model is used. To solve energy equations, the equation of fluid density based on the temperature in ideal gas state has been used. The fluid intended for this analysis is air.

Boundary Condition

The Velocity-Inlet condition for the air is used. The air velocity at the entrance is 1.42 m/s and its temperature is 338K. The tube surface is defined as a stationary wall with a constant temperature of 303K. Given that the geometry is symmetric, lateral boundaries of geometry are defined as Symmetry.The output is considered as Pressure-Outlet.

Discretization of equations

SIMPLE algorithm is used to discretize equations. In this analysis, Pressure-Based solver is used for solving coupled equations of velocity and pressure. For the momentum and energy equations, Second Order Upwind method is used for discretization.

Results have shown as thermal and velocity contours on tube, fin, and the surface of heat exchanger.

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