Heller Indirect Dry Cooling Tower Transient CFD Simulation
In this project, the transient simulation of the Heller cooling tower is investigated.
This product includes a Mesh file and a comprehensive Training Movie.
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In this project, the transient simulation of the Heller cooling tower is investigated. Heller cooling tower is a indirect heat exchanging mechanism in which airflow over water stream and heat exchange process density decreases, and an upward flow is generated. In the present work, an ideal gas model is used for air density modeling. The ideal gas density model is based on the relationship between density and local fluid temperature. Higher the temperature, lower the density, and higher the upward force on fluid volume due to buoyancy effects.
Heller Geometry and mesh
The fluid domain’s geometry is designed in Design Modeler, and the computational grid is generated using Ansys Meshing. The mesh type is unstructured, and the element number is 230000.
Heller CFD Simulation
- The solver type is assumed density Based.
- Time formulation is assumed unsteady.
- Gravity effects are considered in Y direction equal to –9.81 m/s2.
The following table represents a summary of the defining steps of the problem and its solution.
|Near wall treatment||Standard wall treatment|
|Fluid||Definition method||FLUENT database|
|Density model||Ideal gas|
|Gauge pressure||0 kPa|
|Wall thickness||1 m|
|Heat generation rate||51352 W/m3|
|Solver configurations (Heller)|
|Spatial discretization||Gradient||Least square cell-based|
|Run calculation||Time step size||Adaptive|
|Total time||1000 s|
|No. of fixed time steps||2|
|Initial time step size||10e-5|
|Max items per time step||20|
Results and discussion
The pressure difference in orders of 10kPa is generated inside the cooling tower. The velocity of air, only under the influence of buoyancy force, reaches 90 m/s inside the cooling tower and reaches a maximum of 170 m/s on the edge of the cooling tower exit.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.