# Simulation of the heat transfer in a two-tube ( opposite direction ) heat exchanger

A two-tube heat exchanger, also known as a single-tube heat exchanger, is the simplest type of converter used in the industry. A two-tube heat exchanger is made up of two centrifugal tubes, where cold or hot fluid flows through the inner tube and a fluid through the space between the two tubes, and the exchange of heat takes place through the inner tube between the two fluids. It is also called the central heat exchanger.

The two-tube heat exchanger is divided into two groups of non-uniform flow (opposite direction) and uniform flow (same direction) in terms of flow type. In the type of non-uniform flow, the fluid move in the opposite direction, and more heat exchange takes place relative to the uniform flow heat exchangers.

In this analysis, it has been tried to simulate and analyze the heat transfer in a two-tube ( opposite direction ) heat exchanger, using Ansys Fluent software.

### Geometry and Mesh

The geometry required for this analysis is generated by Gambit software. Meshing required for this analysis is also generated by the same software. The type of meshing used in this analysis is structural and the total number of cells produced for this geometry is 115635 cells.

### Model

In this analysis, the K-epsilon Standard Viscosity model is used to check the fluid flow. The Standard Wall Function is also used near the wall. The energy and momentum equation has been solved for this analysis.

### Boundary Condition

The flow input for both warm and cold fluid is defined as Velocity Inlet and its value is also set to 5 m/s for both fluids. The temperature of the hot fluid is 370 and the cold fluid temperature is 300 k. The flow output is also defined as pressure outlet for both fluids. The wall of the converter is also defined as Wall.

### Discretization of equations

In this analysis, the SIMPLE formulation algorithm is used to discretized the velocity and pressure equations. The Momentum equation is also discretized into Second Order Upwind.

The results are presented as velocity contours as well as streamlines.

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