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Porous Mixer for Increasing the Heat Transfer of Nanofluid Flow

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In this project, mixing of hot (303k) and cold (293) nanofluid flows is investigated while mixing of these two streams are done using 28 mixers which are modeled as porous medium.

This product includes Mesh file and a Training Movie.

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Description

Problem description

In this project, mixing of hot (303k) and cold (293) nanofluid flows is investigated while mixing of these two streams are done using 28 mixers which are modeled as porous medium. Nanofluid is modeled as one single fluid with modified thermophysical properties. These properties are calculated using below formulas. Mixers are simulated as porous mediums of Aluminum with porous permeability equal to 1.

porous mixer

where magnetic are density, viscosity, specific heat, and thermal conductivity coefficient of nano-fluid and volume fraction of nano-particles in fluid.

Porous Mixer Geometry and mesh

Geometry of fluid domain is designed in Design modeler and computational grid is generated using Ansys meshing. Mesh type is structured and element number is 35280.

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Porous Mixer CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is effective in -Y direction equal to 3e-8 m/s2..

The following table a summary of the defining steps of the problem and its solution.

Models
Energy On  
Viscous laminar  
Materials
Fluid Definition method Fluent Database
Material name Nano+fluid (based on water, with modification)
Density 1314.536 kg/m3
Specific heat (Cp) 3147 J/kg.K
Thermal conductivity 0.88 w/m.K
Viscosity 0.00098 kg/m.s
Cell zone conditions
Solid Material name Aluminum
Porosity Fluid porosity (1)
Thermal model In equilibrium
Boundary conditions
Inlet cold Type Velocity inlet
Velocity magnitude 8.9329997e-6 m/s
Temperature 293 K
Inlet hot Type Velocity inlet
Velocity magnitude 8.9329997e-6 m/s
Temperature 303 K
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Green gauss cell-based
Pressure Standard
Momentum Second order Upwind
Energy Second order Upwind
Initialization X velocity 0 m/s
Temperature 293.2 K

Results and discussion

Nano-fluid flow average temperature at hot inlet, cold inlet and outlet location is 303, 293 and 293.1K respectively.

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There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.

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