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Non Newtonian Fluid CFD Simulation

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The present project is going to simulate the heat transfer and the flow of a Non-Newtonian fluid containing nanoparticles inside a tube.

 

This ANSYS Fluent project includes CFD simulation files and training movies.

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Description

Project Description

The present project is going to simulate the heat transfer and the flow of a Non-Newtonian fluid containing nanoparticles inside a tube. The base fluid contains water and substances called xanthan which, due to the solubility of xanthan in the water, has the properties of non-Newtonian fluids, with which the non-Newtonian fluid contains aluminum nano oxide (Al2O3) to increase the rate of heat transfer. This simulation was carried out by two-dimensional for simplification, considering the heat flux in the wall. For the non-Newtonian fluid simulation, the Herschel-Bulkley model is used in the viscosity domain.

Assumption (Non-Newtonian)

There are several assumptions used for the present simulation:

The solver is Pressure-Based, and the simulation is Steady. Also, the simulation is performed as axisymmetric.

Geometry & Mesh

The present 2-D modeling is done using Design Modeler software. Due to the simulation of the flow in the tube and the symmetry in it, only one plane of symmetry is modeled. The meshing of the present model was done using ANSYS Meshing software with a structured type. Also, due to the physics of the problem and the existence of heat transfer and better flow simulation along the walls, a near-wall boundary layer mesh is used.

Non-Newtonian Fluid Flo CFD Simulation

We present summaries of the problem definition and problem-solving steps in the table:

Models
Laminar Viscous model
herschel-bulkley Viscosity
on Energy
Boundry conditions (Non-Newtonian)
velocity inlet Inlet type
1.269787769 m/s Velocity magnitude (Re=900)
1.732714752 m/s Velocity magnitude (Re=1600)
295 K Temperature
Pressure outlet Outlet type
0 Pa gauge pressure
300 K backflow total temperature
wall Walls type
No slip Shear condition
8846.4 W.m-2 heat flux
Solution Methods
simple   Pressure-velocity coupling
Second order pressure Spatial discretization
Second order upwind momentum
Second order upwind energy
Initialization
Standard Initialization method
295 K temperature

Boundary Condition (Non-Newtonian)

At the inlet, the velocity inlet boundary condition is set where the velocity value is entered at two different Reynolds in this section for the different simulations and at the inlet temperature is 295 Kelvin. The thermal heat flux condition is introduced. At the symmetry part of the pipe, the axis condition and at the outlet condition the pressure outlet is applied by atmospheric pressure and in the thermal part, it has a backflow temperature of 300 Kelvin.

Reference Value

Since the purpose of the problem is to investigate the heat transfer and fluid behavior only in the fluid zone, we select the fluid flow inside the tubular space as the reference zone.

Validation (Non-Newtonian)

In this project, we simulate a non-Newtonian fluid flow with the help of Computational Fluid Dynamics (CFD).
We compare the CFD results with the paper results for the validation.

“Modeling of forced convective heat transfer of a non-Newtonian nanofluid in the horizontal tube under constant heat flux with computational fluid dynamics”.

We select Figure 3, part “a” as the target diagram for validation,  in two Reynolds 900 and 1600 simulations and we compare the results of the heat transfer coefficient with the paper.

The following table presents the results of this simulation:

Error (%) Present Results Paper Results
1.43 1676.070374 1700 Re=900
5.53 1846.789 1750 Re=1600

As you can see in the table above, the error is low, and the simulation results have a good accuracy.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

 

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