A 2-cm-diameter plastic rod has a thermocouple inserted to measure temperature at the center of the rod. The plastic rod (r = 1190 kg/m3, cp = 1465 J/kg·K, and k = 0.19 W/m·K) was initially heated to a uniform temperature of 70°C, and allowed to be cooled in ambient air temperature of 25°C. After 1388 s of cooling, the thermocouple measured the temperature at the center of the rod to be 30°C. Determine the convection heat transfer coefficient for this process. Solve this problem using analytical one-term approximation method (not the Heisler charts).
A 2-cm-diameter plastic rod has a thermocouple inserted to measure temperature at the center of the rod. The plastic rod (r = 1190 kg/m3, cp = 1465 J/kg·K, and k = 0.19 W/m·K) was initially heated to a uniform temperature of 70°C, and allowed to be cooled in ambient air temperature of 25°C. After 1388 s of cooling, the thermocouple measured the temperature at the center of the rod to be 30°C. Determine the convection heat transfer coefficient for this process. Solve this problem using analytical one-term approximation method (not the Heisler charts).
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
A 2-cm-diameter plastic rod has a thermocouple
inserted to measure temperature at the center of the rod.
The plastic rod (r = 1190 kg/m3, cp = 1465 J/kg·K, and
k = 0.19 W/m·K) was initially heated to a uniform temperature
of 70°C, and allowed to be cooled in ambient
air temperature of 25°C. After 1388 s of cooling, the thermocouple measured the temperature at the center of
the rod to be 30°C. Determine the convection heat transfer
coefficient for this process. Solve this problem using analytical
one-term approximation method (not the Heisler charts).
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