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Electric Field Effect on Nanofluid Heat Transfer (EHD), ANSYS Fluent Training

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In this project, nanofluid flows in a bumpy channel in presence of an applied electrical potential.

This product includes Mesh file and a Training Movie.

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Description

Electric Field Problem description

In this project, nanofluid flows in a bumpy channel in presence of an applied electrical potential. Fluid flow is steady and is simulated as one single phase flow, however thermophysical properties of nanofluid are modified. Electrical characteristics of nanofluid alter the fluid mechanics behavior of flow which results in heat transfer increase. Surface average of nanofluid’s temperature is equal to 300 and 301.926K at inlet and outlet respectively.

electric field

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

Geometry and mesh

Geometry of fluid domain is designed in Design modeler and computational grid is generated using Ansys meshing. Mesh type is unstructured and element number is 17640.

electric field

electric fieldelectric field

Electric Field CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

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

Models (electric field)
Energy On  
Viscous K-epsilon (realizable) Standard wall function
Materials
Fluid Definition method Fluent Database
Material name Water (modified)
Density 998.2 kg/m3
Specific heat (Cp) 4182 J/kg.K
Thermal conductivity 0.6 w/m.K
Viscosity 0.001003 kg/m.s
UDS diffusivity constant
Electrical conductivity 1000000 siemens/m
Magnetic permeability 1.257e-6
Cell zone conditions
Fluid Material name Water (modified)
Boundary conditions (electric field)
Inlet Type Velocity inlet
Velocity magnitude 1 m/s
Turbulence intensity 5%
Turbulent viscosity ratio 10
Temperature 300 K
Outer Wall solid Temperature 340 K
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Second order
Momentum Second order Upwind
Turbulent kinetic energy First order upwind
Turbulent dissipation rate First order upwind
Energy Second order Upwind
Initialization (electric field) Method Hybrid

Results and discussion

Nano-fluid flow average temperature at inlet and outlet location is 300 and 301.96K respectively. In case of no electrical potential affecting the nano-fluid, temperature at outlet decreases to 301.92K. Heat flux to nanofluid is equal to 72474.1 [W].

Mr CFDMr CFDMr CFDMr CFD

comparison between outlet temperature of nano-fluid in presence and absence of electric field, reveals the effectiveness of electric field application in present work. Electric field application increases outlet temperature by .04K and heat transfer to nano-fluid by 54W/m2.

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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