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Three-Dimensional Numerical and Experimental Analysis of Fluid Flow in Micro Channels and Micro-Pin-Fin Arrays

Three-Dimensional Numerical and Experimental Analysis of Fluid Flow in Micro Channels and Micro-Pin-Fin Arrays. Elizabeth Gregg and Huilin Xie. Electronic Cooling. Number of transistors has been increasing at an exponential rate Directly related to an increase in heat flux

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Three-Dimensional Numerical and Experimental Analysis of Fluid Flow in Micro Channels and Micro-Pin-Fin Arrays

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  1. Three-Dimensional Numerical and Experimental Analysis of Fluid Flow in Micro Channels and Micro-Pin-Fin Arrays Elizabeth Gregg and Huilin Xie

  2. Electronic Cooling • Number of transistors has been increasing at an exponential rate • Directly related to an increase in heat flux • Conventional air cooling methods are not enough

  3. Liquid-Cooled Miniature Heat Sinks • Capable of dissipating large amount of heat from small area • Made from copper of silicon • Contains micro-scale heat transfer enhancement structures • Utilizes water, refrigerant or Fluorinert as coolant Miniature Heat Sink High-Heat-Flux Device

  4. Micro-Scale Enhanced Structures • Geometries • Parallel-Plate Fins • Square, Circular, Diamond, Elliptical • Aligned • Staggered

  5. Applications • Electronic Modules in Aircraft • Power Component in Spacecraft • Switching Components in Power Electronics • Diode arrays in Laser Systems

  6. Objectives • To numerically simulate the fluid flow of water across an array of staggered micro-pin-fins using ANSYS Fluent • To determine the pressure drop for a range of Reynolds numbers and flow conditions • To validate numerical results against experimental data

  7. Fluid Flow in Micro-Channels • Geometry • Rectangular Duct • 50 microns by 150 microns • Boundary Conditions • No slip condition at walls • Reynolds's number of 100 • Outlet pressure set to Zero

  8. Rectangular Duct Mesh • Assumptions • Steady State • Laminar Flow • Incompressible Fluid • Meshing • Hexahedral Cells • Bias at Walls

  9. Results

  10. High-Performance Computing on Pople • Created Journal and Submit files to run in parallel • Ran with four processers • Parallel results matched results from local computer

  11. Experimental Pressure Drop Across Circular Micro-Pin-Fin Arrays

  12. Conclusion and Still to Come

  13. Questions?

  14. Geometry Rectangle pins Reynolds Number 110<Re<330 Assumptions Laminar flow Adiabatic Walls Incompressible fluid Measurement Pressure drop between inlet and outlet(pin too small, no sensors can fit into it)

  15. Top View • Dimension 200µm × 200µm × 670µm • One dimensional Flow • Computation domain

  16. Numerical Model Outlet Inlet

  17. Meshes Cell Number 66k 95k 1 million

  18. Prediction Method Pressure Drop= Inlet Pressure + Outlet Pressure + average pressure of planes × 83

  19. Streamline at Inlet

  20. Streamline at last Pin

  21. Velocity Profile at Pin3, 9 and 17

  22. Velocity Profile after Pin 9

  23. Percent Error VS. Meshes

  24. Pressure Drop Vs. Meshes

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