A 21.5-cm-wide and 31 cm high vertical hot surface in 20°C air is to be cooled by a heat sink with equally spaced fins of rectangular profile. The fins are 0.1 cm thick, 4 cm wide, and 31-cm- long in the vertical direction. Given: Consider the characteristic length to be the height of the surface. The properties of air at T₁ = 52.5°C: k = 0.02753 W/m °C, v = 1.823 × 10–5 m²/s, Pr = 0.7222 Determine the optimum fin spacing of the heat sink if the base temperature is 85°C. b. Determine the rate of heat transfer by natural convection from the heat sink if the base temperature is 85°C.
A 21.5-cm-wide and 31 cm high vertical hot surface in 20°C air is to be cooled by a heat sink with equally spaced fins of rectangular profile. The fins are 0.1 cm thick, 4 cm wide, and 31-cm- long in the vertical direction. Given: Consider the characteristic length to be the height of the surface. The properties of air at T₁ = 52.5°C: k = 0.02753 W/m °C, v = 1.823 × 10–5 m²/s, Pr = 0.7222 Determine the optimum fin spacing of the heat sink if the base temperature is 85°C. b. Determine the rate of heat transfer by natural convection from the heat sink if the base temperature is 85°C.
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:A 21.5-cm-wide and 31 cm high vertical hot surface in 20°C air is to be cooled by a heat sink
with equally spaced fins of rectangular profile. The fins are 0.1 cm thick, 4 cm wide, and 31-cm-
long in the vertical direction.
Given: Consider the characteristic length to be the height of the surface. The properties of air at T₁ =
52.5°C: k = 0.02753 W/m °C, v= 1.823 × 10–5 m²/s, Pr = 0.7222
a. Determine the optimum fin spacing of the heat sink if the base temperature is 85°C.
b. Determine the rate of heat transfer by natural convection from the heat sink if the base
temperature is 85°C.
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