'Thermofluid analysis of a heat exchanger' simulation project by dheiny


#1

I created a new simulation project called 'Thermofluid analysis of a heat exchanger':

This project shows an example on how certain phenomena involved in heat exchangers can be simulated with SimScale.


More of my public projects can be found here.


#2

The interior of this pipe heat exchanger is extracted using a local CAD software. The interior of the vessel is then uploaded to SimScale as a STEP model. The mesh is created using the completely automated hex-dominant mesh operation. The only two parameters that have to be adjusted are the fineness of the desired mesh as well as the faces of the model where the cells shall be refined in order to resolve the viscous boundary layer of the flow. The mesh is then computed on four cores. The resulting hex-dominant polyhedral mesh is shown in the figure below.

In this simulation only the fluid that is heated up while passing the heat exchanger is modeled. The heat transported from the warmer fluid within the pipes is assigned as a boundary condition within this simulation. Therefore the temperature of the cold fluid is set to 50° at the inlet. The hot pipes are set to 95°. In this analysis type the cold fluid is modeled as being incompressible while the density variation is only caused by temperature differences. The inlet velocity is set to 1 meter per second. The analysis is carried out on a 4 core machine and took around two hours. The results are then post-processed using the integrated post-processing environment of SimScale which is shown in the figure below.