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Heat Transfer Inside a Zigzag Channel CFD Simulation

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The present study simulates the heat transfer of water flow through a zigzag channel.


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

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Project Description

The present study simulates the heat transfer of water flow through a zigzag channel. The number of times the channel goes up and down horizontally is equal to ten, and the angle of the channel in each of these ten steps is assumed to be 15 degrees for the first model and 45 degrees for the second model. Since the flow Reynolds number has a low value of 107, the flow is defined as laminar.

Water flows into the channel at a velocity of 0.033409888 m.s-1 and a temperature of 393.15 K and exits the end of the channel at a pressure equal to the atmospheric pressure. The lower wall of the zigzag channel is insulated and the upper wall has a constant temperature of 276.65 K.

Zigzag Channel Geometry & Mesh

The present 2-D model is drawn using Design Modeler software. The present model is related to a channel that has a zigzag structure in its horizontal direction, the number of these zigzag modes is ten. In one model, the channel angle is 15 degrees relative to the horizontal ridge, and in the other model, 45 degrees. The figure below shows a graphic geometry for both modeling modes, a 15-degree angle, and a 45-degree angle.

heat transfer

The meshing has been done using ANSYS Meshing software. The mesh type is structured and the element number is 48,000. The following figure shows a view of the mesh.

heat transfer

Heat Transfer CFD Simulation

To simulate the present model, several assumptions are considered, which are:

  • The solver is pressure-based.
  • The simulation is steady.
  • The gravity effect is ignored.

The following is a summary of the steps for defining a problem and its solution:

Models (heat transfer inside a zigzag channel)
Viscous model Laminar
Energy on
Boundary conditions (heat transfer inside a zigzag channel)
Inlet Velocity inlet
velocity megnitude 0.033409888 m.s-1
temperature 393.15 K
Outlet Pressure outlet
gauge pressure 0 pascal
bottom wall (heat transfer inside a zigzag channel) Wall
wall motion stationary wall
heat flux 0 W.m-2
upper wall Wall
wall motion stationary wall
temperature 276.65 K
Solution Methods (heat transfer inside a zigzag channel)
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure second-order
momentum second-order upwind
energy second-order upwind
Initialization (heat transfer inside a zigzag channel)
Initialization method   Standard
x-velocity 0.03227147 m.s-1
y-velocity 0.008647115 m.s-1
temperature 393.15 K

Heat Transfer in a Zigzag Channel Results

After the solution process is completed, two-dimensional velocity, pressure, and temperature contours are obtained for two modes with angles of 15 and 45 degrees. Also, the Nusselt number on the upper wall of the channel along the length for the two modes with angles of 15 and 45 degrees.


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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