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Rough Surface Heat Transfer CFD Simulation

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In this project, the heat transfer process on a rough surface having small serrated fringes is analyzed and simulated.

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

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Description

Project Description

In this project, the heat transfer process on a rough surface having small serrated fringes is analyzed and simulated. The water flow enters the channel with a velocity of 0.0134 m/s, and since the water flow does not have a high Reynolds number, the Laminar model was used to solve fluid flow equations. The energy model is also exploited to calculate the temperature distribution inside the computational domain.

Geometry & Mesh

The geometry of this project is designed in ANSYS design modeler and meshed inside ANSYS meshing software. The mesh type used for this geometry is structured and the total number of elements is 102694.

rough surface rough surface

CFD Simulation Settings

The critical assumptions considered in this project are:

  • The present simulation and its results are considered steady and do not change as a function of time.
  • The effect of gravity has been taken into account and is equal to -9.81 in the Y direction.

The applied settings are recapitulated in the following table.

 
Models
Viscous model Laminar
Energy on
Boundary conditions
Inlet Velocity inlet
Inlet 0.0134 m/s
Temperature 300 K
Outlet Pressure outlet
Gauge pressure 0 Pa
Walls Stationary wall
Wall Heat flux 1000 W/m2
Wall-surface-body Heat flux 0 W/m2
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization Pressure Second order
Momentum second order upwind
energy second order upwind
Initialization
Initialization method   Standard
gauge pressure 0 Pa
Velocity (x,y,z) (0.0134,0,0) m/s
Temperature 300 K

Results & Discussion

We present different contours of velocity, pressure, temperature, etc. after the simulation process and discuss in the following .

As shown in the temperature contour, the fluid temperature has increased after passing over the lower wall’s serrated fringes. These fringes have the role of changing fluid flow regime from Laminar to turbulent for purposes like increasing the total heat transfer.

As previously discussed, fringes’ role in the velocity vector and streamlines contour shows that vortices are generated after the fluid flow has passed over the fringes. In other words, the fluid flow becomes turbulent after the fringes, causing the generation of vortices, and as we all know, the heat transfer coefficient is more than that of the laminar flow.

rough surface rough surface

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

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