# Bitumen Melting Inside a Tank, CFD Simulation ANSYS Fluent Training

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The present problem simulates bitumen melting inside a bitumen tank using ANSYS Fluent software.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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## Bitumen Melting Description

The present simulation is about bitumen melting inside a bitumen tank via ANSYS Fluent. Bitumen is a material that increases in concentration when exposed to cold. In other words, the cold gradually causes the bitumen to freeze inside the tank.

Therefore, hot water flow pipes are used inside these tanks to upper the bitumen temperature inside the tanks and thus prevent it from freezing. In this project, a 2D bitumen tank is designed with periodic conditions.

Inside the tank, several rows of hot water pipes are designed. The bitumen material enters the tank at a low temperature, and its temperature increases when it receives heat from the pipe wall. This simulation uses a solidification and melting model to define phase change materials.

To define bitumen as a phase change material, the maximum temperature at which the solid phase temperature prevails (solidus temperature) is 340.15 K, the minimum temperature at which the liquid phase dominates (liquidus temperature) is 341.15 K, and the latent heat of pure solvent melting heat is defined as 450367 j.kg-1.

Bitumen flow enters the tank with a speed of 0.1 m.s-1 and a temperature of 343.15 K, and contacts the wall of hot water pipes with a constant temperature of 523.15 K.

## Geometry & Mesh

The present geometry is designed in a 2D model via Design Modeler. The computational zone is the interior of a tank with several rows of pipes. This geometry is designed as a 2D plane with periodic conditionsÂ and can turn into a 3D cylindrical tank when checking the results.

The mesh of the present model has been done via ANSYS Meshing. Mesh is structured, and the number of production cells equals 10541.

## Set-up & Solution

Assumptions used in this simulation:

• Pressure-based solver is used.
• The present simulation is unsteady.
• The effect of gravity is ignored.

 Models Viscous k-epsilon k-epsilon model RNG Near-wall treatment standard wall function Solidification & Melting Model On Energy On Boundary conditions Inlet Velocity Inlet velocity magnitude 0.1 m.s-1 temperature 343.15 K Inner Wall Wall wall motion stationary wall thermal condition coupled Outer Wall Wall wall motion stationary wall heat flux 0 W.m-2 Tubesâ€™ Wall Wall wall motion stationary wall temperature 523.15 K Outlet Pressure Outlet gauge pressure 0 pascal Methods Pressure-Velocity Coupling Coupled pressure second-order momentum first-order upwind energy first-order upwind turbulent kinetic energy first-order upwind turbulent dissipation rate first-order upwind Initialization Initialization methods Standard gauge pressure 0 pascal velocity (axial & radial) 0 m.s-1 temperature 293.15 K

## Bitumen Melting Results

After calculation, 2D and 3D contours related to temperature, temperature gradient, pressure, velocity, liquid fraction, and liquid fraction gradient are obtained. The contours show that in the vicinity of the hot pipes, the bitumen rises in temperature. An increase in temperature causes the bitumen to begin to melt. As a result, it prevents the bitumen from freezing.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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