A long Pyroceram rod (Ï = 2600 kg/m 3 , c p = 808 J/kg·K, k =

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A long Pyroceram rod (ρ = 2600 kg/m3, cp= 808 J/kg·K, k = 3.98 W/m·K, and α = 1.89 × 10€“6m2/s) with diameter of 10 mm has an initial uniform temperature of 1000°C. The Pyroceram rod is allowed to cool in ambient temperature of 25°C and convection heat transfer coefficient of 80 W/m2·K. If the Pyroceram rod is allowed to cool for 3 min, determine the temperature at the center of the rod using

(a) Table 18€“2

TABLE 18-2 Coefficients used in the one-term approximate solution of transient one- dimensional heat conduction in plane

(b) The Heisler chart (Fig. 18€“15).

To - To Oo = 1.0 0.7 Sphere 0.5 0.4 0.3 hro Bị 100 0.2 0.1 0.07 0.05 0.04 0.03 0.02 0.01 0.007 0.005 0.004 0.003 0.002

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Related Book For  answer-question

Fundamentals of Thermal-Fluid Sciences

ISBN: 978-0078027680

5th edition

Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala

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