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Unformatted text preview: Chapter 4 Transient Heat Conduction 4127 A man is found dead in a room. The time passed since his death is to be estimated. Assumptions 1 Heat conduction in the body is twodimensional, and thus the temperature varies in both radial r and x directions. 2 The thermal properties of the body are constant. 3 The heat transfer coefficient is constant and uniform over the entire surface. 4 The human body is modeled as a cylinder. 5 The Fourier number is τ > 0.2 so that the oneterm approximate solutions (or the transient temperature charts) are applicable (this assumption will be verified). Properties The thermal properties of body are given to be k = 0.62 W/m. ° C and α = 0.15 × 106 m 2 /s. Analysis A short cylinder can be formed by the intersection of a long cylinder of radius D /2 = 14 cm and a plane wall of thickness 2 L = 180 cm. We measure x from the midplane. The temperature of the body is specified at a point that is at the center of the plane wall but at the surface of the cylinder. The Biot specified at a point that is at the center of the plane wall but at the surface of the cylinder....
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This note was uploaded on 01/19/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Mass, Heat

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