A dead body is found in a room with air temperature of 18 ̊C, and the body’s surface temperature ismeasured to be 30 ̊C at noon. The normal surface temperature of a human body is 37 ̊C and the averagehuman body is more than 70% water so that the body can be assumed to have the same thermophysicalproperties as water (r = 1000 kgm-3 ; k = 0.65 Wm-1 K-1 ; cp = 4200 Jkg-1 K-1 ).Using an average heat transfer coefficient for the cooling process, obtain a better estimate for the timeof death. You may neglect heat loss from the ends of the cylinder and consider only radial conductionwithin the body.
A dead body is found in a room with air temperature of 18 ̊C, and the body’s surface temperature ismeasured to be 30 ̊C at noon. The normal surface temperature of a human body is 37 ̊C and the averagehuman body is more than 70% water so that the body can be assumed to have the same thermophysicalproperties as water (r = 1000 kgm-3 ; k = 0.65 Wm-1 K-1 ; cp = 4200 Jkg-1 K-1 ).Using an average heat transfer coefficient for the cooling process, obtain a better estimate for the timeof death. You may neglect heat loss from the ends of the cylinder and consider only radial conductionwithin the body.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A dead body is found in a room with air temperature of 18 ̊C, and the body’s surface temperature is
measured to be 30 ̊C at noon. The normal surface temperature of a human body is 37 ̊C and the average
human body is more than 70% water so that the body can be assumed to have the same thermophysical
properties as water (
r = 1000 kgm-3 ; k = 0.65 Wm-1 K-1 ; cp = 4200 Jkg-1 K-1 ).
Using an average heat transfer coefficient for the cooling process, obtain a better estimate for the time
of death. You may neglect heat loss from the ends of the cylinder and consider only radial conduction
within the body.
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