This heat exchanger example illustrates the multiphysics modeling capabilities of FEATool. The model consists of a series of heated pipes surrounded by a fluid at a lower temperature, and features effects of both free and forced convection. Two types of physical phenomena are considered, fluid flow which is modeled by the Navier-Stokes equations, and heat transfer modeled by a convection and conduction transport equation for the temperature. This system features a two-way multiphysics coupling, the fluid is coupled to and transports the temperature field, and the temperature is also coupled back to the fluid via the Boussinesq approximation accounting for buoyancy effects.

Due to symmetry one can simplify the full geometry and only study a
two dimensional slice between the heated pipes. The geometry will
therefore consist of a *0.0075* by *0.05 m* rectangle from which a
half circle with radius *0.003 m* centered at *(0, 0.02)* is
removed. The mechanism for heating the pipes is not taken in
consideration and are thus assumed to be at a fixed temperature of
*T _{h} = 330 K*. A cooling fluid flows from the bottom to the
top and has an inlet temperature of

*T*. The other fluid and material parameters can be found in the model tutorial.

_{c}= 300 KThis model is available as an automated tutorial by selecting **Model
Examples and Tutorials…** > **Quickstart** > **Heat Exchanger** from
the **File** menu, and also as the MATLAB simulation m-script example
ex_heat_exchanger1. Step-by-step
tutorial and video instructions how to set up and run this model are
linked below.