Multiphysics assignment2

Multiphysics assignment2 - the entire structure (you can...

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Multiphysics Assignment #2:Due March 1st Model the following 2-D thermo-electric system (not drawn to scale): It is a axisymmetric structure used to power a filament in the center. x 0.1m 0.01m 0.1m 0.05m 0.05m Mat. 1 Mat. 1 Mat. 2 Mat. 1 Mat. 1 A 10000 Amp current is being applied from left to right. Temperature=30ºC at the left and right ends of the structure Each section is 0.1m in length. Material 1: k =398 W/ ºK m, ρ =0.00000170 ohm-cm – From for Copper Material 2: k =163.3 W/ ºK m, = 0.00000565 ohm-cm – From for Tungsten – this is actually used in light bulb filaments. 1) Conduct a FEM analysis of the above case. a) perform mesh convergence b) plot the current density c) plot the temperature d) what is the voltage drop across the connector e) Calculate the electrical resistance of the structure 2) Using a 1-D assumption, approximate the temperature drop and voltage drop across
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Unformatted text preview: the entire structure (you can use the analysis we did in class). . a) what is the current density in each section? b) what is the voltage drop in each section? c) compare your predicted electrical resistance to the FEMs prediction. d) compare your predicted 1-D temperature distribution to the FEMs prediction. 3) a)Although this is a crude analysis, compare the temperature predicted for the filament with that for an actual light bulb. A light bulb filament temperature is approximately 2000C. At this temperature, the filament actually emits visible radiation (light) that is not considered in the current work. b) If the temperature is not high enough, use your analytical model to predict what current must be applied to reach this temperature. c) Use the same analytical model to predict the temperature of the copper at this current. Do you think that the copper will melt?...
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This note was uploaded on 11/14/2011 for the course MECH 7970 taught by Professor Choe,s during the Spring '08 term at Auburn University.

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