Thermodynamics HW Solutions 397

Thermodynamics HW Solutions 397 - Chapter 4 Transient Heat...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 4 Transient Heat Conduction 4-127 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 two-dimensional, 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 one-term 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 × 10-6 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....
View Full Document

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.

Ask a homework question - tutors are online