In an experiment, a metallic cylinder internally by an electric heater and subjected to a cross flow of air. The velocity and temperature of the air were V = 12 m/s and To = 26.2°C, respectively. The heater power dissipation was measured to be P = 48 W, and the surface temperature was maintained at T= 128.4°C. Neglect heat loss by radiation and conduction. (a) Determine the convection heat transfer coefficient from the experimental observation. in (b) Compare the experimental result with the convection coefficient computed from Zhukauskas relation. Assume, for air at T = 300 K: v= 15.89x10° m²/s, k= 26.3x10* W/m.K, Pr= 0.707; for air at T, = 401 K: Pr= 0.690. %3D %3! Show all calculations.
In an experiment, a metallic cylinder internally by an electric heater and subjected to a cross flow of air. The velocity and temperature of the air were V = 12 m/s and To = 26.2°C, respectively. The heater power dissipation was measured to be P = 48 W, and the surface temperature was maintained at T= 128.4°C. Neglect heat loss by radiation and conduction. (a) Determine the convection heat transfer coefficient from the experimental observation. in (b) Compare the experimental result with the convection coefficient computed from Zhukauskas relation. Assume, for air at T = 300 K: v= 15.89x10° m²/s, k= 26.3x10* W/m.K, Pr= 0.707; for air at T, = 401 K: Pr= 0.690. %3D %3! Show all calculations.
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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Transcribed Image Text:In an experiment, a metallic cylinder 12.7 mm in diameter and 94 mm long is heated
internally by an electric heater and subjected to a cross flow of air. The velocity and
temperature of the air were V = 12 m/s and T = 26.2°C, respectively. The heater power
dissipation was measured to be P = 48 W, and the surface temperature was maintained at
T 128.4°C. Neglect heat loss by radiation and conduction.
(a) Determine the convection heat transfer coefficient from the experimental
%3D
%3D
%3D
observation.
(b) Compare the experimental result with the convection coefficient computed from
Zhukauskas relation.
Assume, for air at T = 300 K: v = 15.89x10° mʻ/s, k= 26.3x10³ W/m.K, Pr= 0.707;
for air at T, = 401 K: Pr= 0.690.
%3D
08.
%3D
Show all calculations.
Air
k-L
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