A tantalum rod of diameter 3 mm and length 120 mmis
Chapter 5, Problem 5.133(choose chapter or problem)
A tantalum rod of diameter 3 mm and length 120 mmis supported by two electrodes within a large vacuumenclosure. Initially the rod is in equilibrium with theelectrodes and its surroundings, which are main-tained at 300 K. Suddenly, an electrical current,I?80 A, is passed through the rod. Assume theemissivity of the rod is 0.1 and the electrical resistiv-ity is 9510?8??m. Use Table A.1 to obtain theother thermophysical properties required in yoursolution. Use a finite-difference method with a spaceincrement of 10 mm (a) Estimate the time required for the midlength of therod to reach 1000 K.(b) Determine the steady-state temperature distribu-tion and estimate approximately how long it willtake to reach this condition
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