The surface convection coefficient is h figure 1111

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Unformatted text preview: rature To, when suddenly immersed in air at temperature Tair. The convection coefficient between the wire and the air is h. Figure 109.1 Cooled Copper Wire Problem Sketch Material Properties ρ = 558 lb/ft3 c = 0.091 Btu/lb-°F h = 2 Btu/hr-ft2-°F Geometric Properties d = 1/32 in Loading Tair = 100°F To = 300°F (at t=0) Analysis Assumptions and Modeling Notes The node locations are arbitrary (coincident). The final time of 0.05 hr (180 sec) is sufficient for the theoretical response comparison. An initial integration time step of 0.05/40 = 0.00125 hr is used. Automatic time stepping is used. The thermal capacitance C, and the surface area of the wire As, are calculated based on a unit length as follows: ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–245 VM109 Results Comparison Target ANSYS Ratio T, °F @ 0.0125hr 193.89 196.48 1.013 T, °F @ 0.0325hr 128.00 130.05 1.016 T, °F @ 0.05hr 109.71 110.83 1.010 1. POST26, Node 1 temperature history Figure 109.2 Temperature vs...
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