Triple Heat Exchanger CFD Simulation, Ansys Fluent

In this project, a Triple Heat Exchanger has been simulated, and the results have been investigated using ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis. The present model is designed in three dimensions using Design Modeler software. The geometry of the solution consisted of three pipes that were concentrated inside each other. The triple concentric tube heat exchanger (TCTHE) is a modified constructive version of a double concentric tube heat exchanger by adding an intermediate tube. The meshing of the model has been done using ANSYS Meshing software. The element number is 1964903.

CFD Methodology

This work aims to investigate the heat transfer in a triple concentric tube heat exchanger. Heat exchangers are widely used in industrial applications where the vital need to cool down a fluid and move it is satisfied by using heat exchangers. In this project, three concentric tubes are considered, and the heat transfer between each of the two concentric tubes is calculated. The water enters the innermost pipe with a mass flow rate of 0.1 kg/s and a temperature of 280K. The entering flow into the middle pipe has a mass flow of 0.05kg/s and a temperature of 330K, and finally, the water flow enters the outer pipe with a velocity of 0.05m/s and a temperature of 290K. Moreover, the laminar model and energy equation are enabled to solve the fluid equations and calculate the temperature distribution within the domain.

Conclusion

At the end of the solution process, two-dimensional and three-dimensional contours related to temperature are obtained. As can be seen, the water flow temperature within the middle pipe decreases as it loses heat to water flows in the inner and outermost pipes.