Double Pipe Heat Exchanger Using ANSYS Workbench
In order to design a Double Pipe Heat Exchanger in ANSYS 16.1 the next steps were
a) Creating the project:
- Open the ANSYS 16.1 workbench;
- Select Fluid Flow (Fluent) in the toolbox menu at the left area of the window and create a new project.
- Rename the Project on “double-pipe” as shown in the Figure 1 below.
Figure 1. Project “double-pipe”
- Save the project
b) Creating Geometry:
- Open the DesignModeler by double-clicking the Geometry button.
- Select the YZPlane in the Tree Outline and select ‘Look At’.
- Create New Sketch by pushing the button on the Plane/Sketch toolbar.
- Repeat step 3 four times.
- Select Sketch1. Switch to the sketching mode from Modeling mode and in settings select
Grid ‘Show in 2D’ ‘Snap’. Select the Major Grid Spacing to be 1 m, and Minor-Steps per Major to be 10.
- Create an Arc by Center by clicking the origin and then the Y axis to select the start of the arc, and then the Z axis to show the end (see figure 2).
Figure 2. Sketch 1 ‘Arc’
- Create a close quarter by drawing two lines from to edges of the arc to the origin.
- Select the dimensions of the arc by clicking ‘Dimensions’ ‘Radius’. Select the value of R1 to be 0.3 m.
- Click the Modeling tab.
- Select Sketch 2 – Sketching Tab.
- Select the Arc by Center in order to create two arcs like at the Sketch 1. connect edges of two arcs accordingly.
- Repeat step 11 for Sketch 3 and 4 (see the Figure 3 below).
Figure 3. Sketches of the arcs
- Extrude the Sketch 1 with the Depth of 10 meters. Click Generate.
- Extrude the Sketch 2, where the Operation should be changed to Add Frozen in Details View. The Depth should be equal to 10 m as well.
- Repeat Step 14 for all Sketches. (see Figure 4 below)
Figure 4. Extruded section of the double-pipe
- Select each part in a body-tree and change the names and solid/fluid on: ‘Inner-Fluid’, fluid; ‘Inner_pipe’, solid; ‘Outer_fluid’, fluid; ‘Outer_pipe’, solid accordingly.
- Select all four bodies, and Form New Part by right-clicking on them.
- Close DesignModeler and Save in Workbench.
c) Generation of the mesh:
- Double click Mesh in the Project Schematic.
- Select the YZOplane view.
- Select the Cursor Mode to Face.
- Select Create Named Section with the name ‘Inner_inlet’ on the innermost section of the detail. (see the Figure 5 below).
- Repeat the operation for the third section (name it ‘Outer_inlet’).
- At the opposite side of the detail repeat the previous steps but enter the names: ‘Inner_outlet’ and ‘Outer_outlet’ accordingly.
- Select the outer surface of the pipe and select Create Named Section with the name “insulation_surface”.
- Select all four surfaces of the pipe and click Create Named Section and enter symmetry_1.
- Repeat the operation for the other side of the pipe with the name “Symmetry_2”.
- Select Mesh by clicking on it. Change the Relevance Center from Coarse to medium.
Click ‘Update’ button. (see result in the Figure 6 below). Close the Mesh window and Save the project.
Figure 6. Mesh
- Click Setup;
- Select Models, Energy On, Viscous, k-Epsilon, Radiation, Discrete ordinates (DO).
- Select Materials;
- Click Fluent Database;
- Select Water-liquid.
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