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Heat Exchanger CFD Simulation by ANSYS Fluent

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The present problem is to simulate a heat exchanger using ANSYS Fluent software.

This product includes Mesh file and a Training Movie.

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Description

Project Description

The present problem is to simulate a heat exchanger using ANSYS Fluent software. In this simulation, air flow enters the device at a velocity of 22 m.s-1 and a temperature of 313 K and exits the exchanger at a pressure equal to atmospheric pressure. For the operating mechanism of the device, it is assumed that the upper and lower surfaces of the device have a thermal boundary condition of the constant temperature type equivalent to a temperature of 323 K. Also, a curved central wall in this device with several rows of blades and fins is designed to help better air flow and better heat transfer.

The purpose of this work is to investigate the effect of high temperature walls on the temperature of the air flow through the interior of the heat exchanger.

Heat Exchanger Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The model includes a heat exchanger with dimensions of 0.0018 m, 0.0082 m and 0.0162 m; So that its inlet and outlet ducts are on both sides and a curved inner wall with several rows of blades is located inside it and its upper and lower walls are distinguished as surfaces with temperature condition.

heat exchanger

We carry out the meshing of the model using ANSYS Meshing software, and the mesh type is unstructured. The element number is 2039783. The following figure shows the mesh.

heat exchanger

Heat Exchanger CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

The following table represents a summary of the defining steps of the problem and its solution:

Models (Heat Exchanger)
Viscous   k-epsilon
  k-epsilon model standard
  near wall treatment standard wall function
Energy   On
Boundary conditions (Heat Exchanger)
Inlet   Velocity Inlet
  velocity magnitude 22 m.s-1
  temperature 313 K
Outlet   Pressure Outlet
  gauge pressure 0 Pascal
Solid Wall (CFD Simulation) Wall
  wall motion stationary wall
  heat flux 0 W.m-2
Heat Wall   Wall
  wall motion stationary wall
  temperature 323 K
Methods (Heat Exchanger)
Pressure-Velocity Coupling   SIMPLE
  Pressure second order
  momentum second order upwind
  turbulent kinetic energy first order upwind
  turbulent dissipation rate first order upwind
  energy second order upwind
Initialization (Heat Exchanger)
Initialization methods   Standard
  gauge pressure 0 pascal
  x-velocity & y-velocity 0 m.s-1
  z-velocity 22 m.s-1
  temperature 313 K

Results

At the end of the solving process, three-dimensional and two-dimensional contours related to pressure, velocity and temperature are obtained. The contours show that the incoming air flow to the heat exchanger is affected by the hot walls and its temperature increases.

There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.

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