Electric Field Effect on Nanofluid Heat Transfer (EHD), ANSYS Fluent Training
In this project, nanofluid flows in a bumpy channel in presence of an applied electrical potential.
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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.
where 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 CFD Simulation
- 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)|
|Viscous||K-epsilon (realizable)||Standard wall function|
|Fluid||Definition method||Fluent Database|
|Material name||Water (modified)|
|Specific heat (Cp)||4182 J/kg.K|
|Thermal conductivity||0.6 w/m.K|
|Electrical conductivity||1000000 siemens/m|
|Cell zone conditions|
|Fluid||Material name||Water (modified)|
|Boundary conditions (electric field)|
|Velocity magnitude||1 m/s|
|Turbulent viscosity ratio||10|
|Outer Wall solid||Temperature||340 K|
|Spatial discretization||Gradient||Least square cell-based|
|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].
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.