Explanation Given: The surface temperature ( T s ) is 5800 K . The emissivity ( ε 1 ) of the filament is 0.35 . The emissivity ( ε 2 ) of the filament is 0.95 . The wavelength ( λ ) of the filament is 3 μ m . Calculation: Calculate the constant ( C ) using the relation. C = λ T = ( 3 μ m ) ( 5800 K ) = 17400 μ m-K Refer to the table 21 − 2 for the “Blackbody Radiation function f λ ”. To obtain the values: f λ = 0.978746 Calculate the emissivity using the relation. ρ ( T ) = ρ 1 f λ 1 ( T ) + ρ 2 ( f λ 1 ) ( T ) = ( 0.35 ) ( 0.978746 ) + ( 0.95 ) ( 1 − 0.978746 ) = 0.362 Calculate the reflectivity using the relation. α + ρ = 1 α = 1 − ρ α = 1 − 0

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Author: Yunus A. Cengel Dr., Robert H. Turner, John M. Cimbala

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Chapter 21, Problem 45P

To determine

The average emissivity of the surface.

The average absorptivity and reflectivity of each surface for radiation.

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Chapter 21, Problem 44P

Chapter 21, Problem 46P

Chapter 21 Solutions

Fundamentals of Thermal-Fluid Sciences

Ch. 21 - Prob. 1P Ch. 21 - By what properties is an electromagnetic wave...Ch. 21 - What is thermal radiation? How does it differ from...Ch. 21 - Prob. 4P Ch. 21 - Prob. 5P Ch. 21 - Prob. 6P Ch. 21 - Prob. 7P Ch. 21 - Prob. 8P Ch. 21 - Prob. 9P Ch. 21 - Prob. 10P

Ch. 21 - A radio station is broadcasting radio waves at a...Ch. 21 - Prob. 12P Ch. 21 - Prob. 13P Ch. 21 - Prob. 14P Ch. 21 - Prob. 15P Ch. 21 - Define the total and spectral blackbody emissive...Ch. 21 - Prob. 17P Ch. 21 - Prob. 18P Ch. 21 - Prob. 19P Ch. 21 - Prob. 20P Ch. 21 - A small body is placed inside of a spherical...Ch. 21 - Prob. 23P Ch. 21 - A thin vertical copper plate is subjected to a...Ch. 21 - Prob. 25P Ch. 21 - Prob. 26P Ch. 21 - The temperature of the filament of an incandescent...Ch. 21 - The temperature of the filament of an incandescent...Ch. 21 - Prob. 30P Ch. 21 - Prob. 31P Ch. 21 - Prob. 32P Ch. 21 - Prob. 33P Ch. 21 - Prob. 34P Ch. 21 - Define the properties emissivity and absorptivity....Ch. 21 - Define the properties reflectivity and...Ch. 21 - Prob. 37P Ch. 21 - Prob. 38P Ch. 21 - A furnace that has a 40-cm × 40-cm glass window...Ch. 21 - Prob. 40P Ch. 21 - The emissivity of a tungsten filament can be...Ch. 21 - Prob. 42P Ch. 21 - Prob. 43P Ch. 21 - Prob. 44P Ch. 21 - Prob. 45P Ch. 21 - Prob. 46P Ch. 21 - An opaque horizontal plate is well insulated on...Ch. 21 - Prob. 48P Ch. 21 - Prob. 49P Ch. 21 - Prob. 50P Ch. 21 - What does the view factor represent? When is the...Ch. 21 - How can you determine the view factor F12 when the...Ch. 21 - What are the summation rule and the superposition...Ch. 21 - Prob. 54P Ch. 21 - Consider two coaxial parallel circular disks of...Ch. 21 - Consider two coaxial parallel circular disks of...Ch. 21 - Prob. 57P Ch. 21 - Prob. 58P Ch. 21 - Prob. 59P Ch. 21 - Prob. 60P Ch. 21 - Determine the four view factors associated with an...Ch. 21 - Prob. 62P Ch. 21 - Prob. 63P Ch. 21 - Prob. 64P Ch. 21 - Prob. 65P Ch. 21 - Prob. 66P Ch. 21 - Determine the view factors F13 and F23 between the...Ch. 21 - Prob. 68P Ch. 21 - Prob. 69P Ch. 21 - Two infinitely long parallel plates of width w are...Ch. 21 - Prob. 71P Ch. 21 - Prob. 72P Ch. 21 - Prob. 73P Ch. 21 - Why is the radiation analysis of enclosures that...Ch. 21 - Prob. 75P Ch. 21 - Prob. 76P Ch. 21 - Prob. 77P Ch. 21 - What are the two methods used in radiation...Ch. 21 - Prob. 79P Ch. 21 - Prob. 80P Ch. 21 - Prob. 82P Ch. 21 - Two black parallel rectangles with dimensions 3 ft...Ch. 21 - Prob. 84P Ch. 21 - Prob. 85P Ch. 21 - Prob. 86P Ch. 21 - Prob. 87P Ch. 21 - Prob. 88P Ch. 21 - Consider a hemispherical furnace of diameter D = 5...Ch. 21 - A dryer is shaped like a long semicylindrical duct...Ch. 21 - Prob. 91P Ch. 21 - Prob. 92P Ch. 21 - Prob. 93P Ch. 21 - Prob. 94P Ch. 21 - Prob. 95P Ch. 21 - Prob. 96P Ch. 21 - Prob. 97P Ch. 21 - Prob. 99P Ch. 21 - Prob. 100P Ch. 21 - Prob. 101P Ch. 21 - Reconsider Prob. 21–101. Using an appropriate...Ch. 21 - Air is flowing between two infinitely large...Ch. 21 - Prob. 104P Ch. 21 - Prob. 105P Ch. 21 - Prob. 106P Ch. 21 - Prob. 107P Ch. 21 - Prob. 108P Ch. 21 - Prob. 109P Ch. 21 - Prob. 111P Ch. 21 - Prob. 112P Ch. 21 - Prob. 113P Ch. 21 - Prob. 114P Ch. 21 - A 1-m-diameter spherical cavity is maintained at a...Ch. 21 - Prob. 117RQ Ch. 21 - Prob. 118RQ Ch. 21 - Prob. 119RQ Ch. 21 - Prob. 120RQ Ch. 21 - Prob. 121RQ Ch. 21 - Prob. 122RQ Ch. 21 - Prob. 123RQ Ch. 21 - Prob. 124RQ Ch. 21 - Prob. 125RQ Ch. 21 - Consider an enclosure consisting of eight...Ch. 21 - Consider a cylindrical enclosure with A1, A2, and...Ch. 21 - Two parallel back disks are positioned coaxially...Ch. 21 - Two parallel concentric disks, 20 cm and 40 cm in...Ch. 21 - A dryer is shaped like a long semicylindrical duct...Ch. 21 - Prob. 131RQ Ch. 21 - Prob. 132RQ Ch. 21 - Prob. 133RQ Ch. 21 - Prob. 134RQ Ch. 21 - A 2-m-internal-diameter double-walled spherical...Ch. 21 - Prob. 136RQ Ch. 21 - Prob. 137RQ Ch. 21 - Prob. 138RQ

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