tailieunhanh - TRANSIENT and STEADY STATE THERMAL ANALYSIS OF HEATSINK Pro/ENGINEER and Pro/MECHANICA Wildfire

TRANSIENT and STEADY STATE THERMAL ANALYSIS OF HEATSINK Pro/ENGINEER and Pro/MECHANICA Wildfire Dr. Herli Surjanhata ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN Background A steady state thermal analysis calculates effects of constant thermal loads on a model and is used to determine temperatures, heat flow rates, and the heat fluxes in a part. A steady state analysis is commonly used as a precursor to a transient thermal analysis to determine the initial conditions. A transient thermal analysis is used to determine the temperature, heat storage and other thermal quantities in a model due to a time varying load. Because the applied load may be time. | NUT ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN TRANSIENT and STEADY STATE THERMAL ANALYSIS OF HEATSINK Pro ENGINEER and Pro MECHANICA Wildfire Dr. Herli Surjanhata Background A steady state thermal analysis calculates effects of constant thermal loads on a model and is used to determine temperatures heat flow rates and the heat fluxes in a part. A steady state analysis is commonly used as a precursor to a transient thermal analysis to determine the initial conditions. A Steady-stare solution is obtained from die foil owing equation ar K Sx Where y Heat flux . the heat transfer rate in the x direction per unit area pep en di ail ar w the heat transfer K Effective thermal conductivity T ar Temperature and Temperature gradient. A transient thermal analysis is used to determine the temperature heat storage and other thermal quantities in a model due to a time varying load. Because the applied load may be time dependent the solution is time dependent. All other considerations such as the type of the thermal load and the modes of heat transfer are the same as in a steady state analysis. Transient analysis is probably the most common form of thermal analysis. A transient thermal analysis solves the following equation axÎÆa q pc ai Where q Uniform heat generation generated per unit volume p Density Specific hear K Effective thermal conductivity T ST Bx ar ar Temperature Temperature gradient and Timfrderivative of T 1 Problem Statement An engineer must attach copper heat sink to a CPU. The heat sink will be subjected to a time varying 50 Watt load and a constant convection of 100W mC. The time required to reach steady state will be determined. A fringe plot of the temperature distribution after 1000 seconds will be made. Create the Heat Sink Part Create a new part called Edit - Setup - Units Select Meter Kilogram Second MKS in the Units Manager dialog box. Click on Set button. Choose Interpret dimensions OK - Close to close the Units Manager .

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