Microchannel Heat Sink, Heat Transfer Enhancement, ANSYS Fluent Training

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The present problem simulates the heat transfer of water flow inside a microchannel heat sink using ANSYS Fluent software.

This product includes a Mesh file and a comprehensive Training Movie.

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Project Description

The present problem simulates the heat transfer of water flow inside a microchannel heat sink using ANSYS Fluent software. One of the serious problems in designing electronic equipment due to its small structure is eliminating the generated heat. This simulation investigates the thermal performance of a cylindrical microchannel heat sink for electronic equipment cooling. This thermal sink consists of 86 microchannel with a rectangular cross-section with a hydraulic diameter of 560 micrometers around the cylindrical geometry. Water flows at a rate of 0.59 m.s-1, and a temperature of 297 K enters the microchannel duct. The model’s central core is considered a heat source; thus, the model’s inner wall is assumed to have a constant flux boundary condition equal to 243507 W.m-2.

heat sink

Microchannel Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The model is related to a cylindrical heat sink with a microchannel. The internal radius of the model is equal to 5 mm, and its thickness is equal to 10 mm. Due to the symmetrical structure of the geometry, only one segment of it is designed, and the periodic boundary condition is used.

heat sink

We carry out the model’s meshing using ANSYS Meshing software. The mesh type is structured. The element number is 1500000. The following figure shows the mesh.

heat sink

Heat Sink CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

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

Viscous Laminar
Energy On
Boundary conditions
Inlet Velocity Inlet
velocity magnitude 0.59 m.s-1
temperature 297 K
Outlet Pressure Outlet
gauge pressure 0 pascal
Inner Wall Wall
wall motion stationary wall
heat flux 243507 W.m-2
Outer Wall Wall
wall motion stationary wall
heat flux 0 W.m-2
Internal Wall Wall
wall motion stationary wall
thermal condition coupled
Pressure-Velocity Coupling SIMPLE
pressure second order
momentum second order upwind
energy second order upwind
Initialization methods Hybrid


At the end of the solution process, three-dimensional contours related to pressure, temperature, and velocity are obtained. These three-dimensional contours are related to the interior of microchannel. Also, the two-dimensional temperature contour is obtained in three different sections of the model. It includes the flow of fluid inside the microchannel and the solid part of the model. It should be noted that this simulation is performed only for one segment of the model and with the periodic boundary condition. Therefore, at the end of the work, the segment is rotated around a central axis so that the contours can be formed in three dimensions. Temperature counters show well that the solid part of the model has decreased in temperature and, as a result, the cooling process has taken place.

A Mesh file and a comprehensive Training Movie present how to solve the problem and extract all desired results.


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