Concept explainers
The net radiation heat transfer rate through the shield under steady conditions.
Explanation of Solution
Given:
The diameter of disks
The distance between two disks
The emissivity of radiation shield
The temperature of disk
The temperature of disk
The temperature of environment
Calculation:
Calculate the radius of the disks
Calculate the ratio of radius and distance between two disks
Refer Table Figure 21-35 “View factor between coaxial parallel disks”.
Obtain the following values of view factors of different disks corresponding to the ratio of radius to the distance between two disks
Calculate the view factor from surface
Calculate the area of the disk
Calculate the heat transfer between top surface of middle disk and its black surrounding
Calculate the heat transfer between bottom surface of middle disk
Thus, the net radiation heat transfer rate through the shield under steady conditions is
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Chapter 21 Solutions
Fundamentals of Thermal-Fluid Sciences
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