Thermodynamics HW Solutions 315

Thermodynamics HW Solutions 315 - Chapter 4 Transient Heat...

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Chapter 4 Transient Heat Conduction 4-40E Long cylindrical steel rods are heat-treated in an oven. Their centerline temperature when they leave the oven is to be determined. Assumptions 1 Heat conduction in the rods is one-dimensional since the rods are long and they have thermal symmetry about the center line. 2 The thermal properties of the rod are constant. 3 The heat transfer coefficient is constant and uniform over the entire surface. 4 The Fourier number is τ > 0.2 so that the one-term approximate solutions (or the transient temperature charts) are applicable (this assumption will be verified). Properties The properties of AISI stainless steel rods are given to be k = 7.74 Btu/h.ft. ° F, α = 0.135 ft 2 /h. Analysis
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