Heat sink analysis: analytically and via ANSYS

ME 340 Final Project - Dr. Soloviev - Fall 2010by

Mathew Marshal & Kevin Hoopes

Problem definition•Intel core i7 processors can dissipate up to 130W under full load•They must be kept below 373 K to prevent hardware damage• We are given a certain rectangular fin, integral heat sink•Find the required convection coefficient to keep the base below 373 K.

Boundary Conditions•Base exposed to constant heat input of 130W•Sides of base are adiabatic•Sides and tops of fins are exposed to convective heat transfer to surrounding atmosphere at 298 K•Heat sink is solid Aluminum

ANSYS Solution•Define Geometry•Apply boundary conditions•Mesh•Solve

ANSYS Solution•Results obtained for initial guess for h•Iterated until base temperature reached approximately 373 K•h value found to be 37.6 W*K/m^2

Analytical Solution•h = 39.8 W*K/m^2

Summary•ANSYS Solution – 37.5•Analytical Solution – 39.8

Appendix Analytical Solution ANSYS Log file