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Microchannel Heat Source CFD Simulation, ANSYS Fluent Training

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In this project, fluid flows in a microchannel surrounded with copper channel considering a heat flux wall is simulated.

This product includes Mesh file and a Training Movie.

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Description

Problem description

In this project, fluid flows in a microchannel which is surrounded with copper solid channel, having a heat flux wall. Electronical devices which have millimeter dimensions are in constant need of cooling due to their high heat generation rate. Macro heat exchangers and radiators are not efficient enough to cool down these devices which generate heat at megawatts per meter square. Periodic boundary condition is used to simulate microchannel real geometry at lowest computational cost. Heat flux on microchannel wall is equal to 243507.0629 W/m2. This heat flux increases the fluid temperature from 297 k on inlet to 304.64 k on outlet.

Microchannel 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 1500000.

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Heat Source Solver configuration

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 (microchannel)
Energy On
Viscous laminar
Materials
Fluid Definition method Fluent Database
Material name Water
Cell zone conditions (microchannel)
Solid Material name Copper
Boundary conditions (microchannel)
Inlet Type Velocity inlet
Velocity magnitude 0.59 m/s
Temperature 297 K
Hot wall Type wall
Heat flux 243507.0629 W/m2
Solver configurations (microchannel)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum Second order Upwind
Energy Second order Upwind

Results and discussion

Water flow average temperature at inlet and outlet boundaries is 297 and 304.67 k, respectively.

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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