Two parallel concentric disks, 20 cm and 40 cm indiameter, are separated by a distance of 10 cm. The smallerdisk (« = 0.80) is at a temperature of 300°C. The larger disk(« = 0.60) is at a temperature of 800°C.(a) Calculate the radiation view factors.(b) Determine the rate of radiation heat exchange betweenthe two disks.(c) Suppose that the space between the two disks is completelysurrounded by a reflective surface. Estimatethe rate of radiation heat exchange between the twodisks.

Two parallel concentric disks, 20 cm and 40 cm indiameter, are separated by a distance of 10 cm. The smallerdisk (« = 0.80) is at a temperature of 300°C. The larger disk(« = 0.60) is at a temperature of 800°C.(a) Calculate the radiation view factors.(b) Determine the rate of radiation heat exchange betweenthe two disks.(c) Suppose that the space between the two disks is completelysurrounded by a reflective surface. Estimatethe rate of radiation heat exchange between the twodisks.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.23P

See similar textbooks

Related questions

Q: EX3 Two coaxial cylinders of diameters D=0.10 m and D 0.30 m and emissivities 1 = 0.7 and 2=0.4 are…

Q: A circular cone of diameter D with a length L ispositioned on a common axis with a circular disk,…

A: The diagrams of the cone and cylinder are given as, For both given configurations, Now, apply the…

Q: ) Define Stefan-Boltzmann Law and emissivity. b) Is there any surface whose emissivity value is…

Q: According to an Atomic Energy Commissionreport, a hydrogen bomb can be approximated as a large…

A: Write the given data:

Q: Consider two coaxial parallel circular disks of equal diameter D that are spaced apart by a distance…

A: Considering the diameter of the two discs are equal. Thus, the radii of the two-discs are equal.…

Q: Looking down at a surface while a cold fluid flows tangentially over it from left to right, the blue…

Q: Consider a 20-cm-diameter spherical ball at 800 K suspended in air. Assuming the ball closely…

A: Given data as per question Diameter of sphere = 20 cm Sphere temperature = 800 k wavelength = 3um

Q: Consider the 5cm × 5cm × 5 cm cubical furnace shown in Figure, whose surfaces closely approximate…

Q: A circular ceramic plate that can be modeled as a blackbody is being heated by an electrical heater.…

A: The heat transfer to the plate due to convection,

Q: A spherical tank of diameter, D = 2 m that is filled with liquid nitrogen at 100 K is kept in an…

Q: Light from an ideal spherical blackbody 15.0 cm in diameteris analyzed by using a diffraction…

A: Given data: The diameter of the black body is d=15 cm The angle is θ=14.4°

Q: 55. At what net rate does heat radiate from a 275-m² black roof on a night when the roof's…

A: As per given question T1=30° c T2=15°c A=0.900 m2 we have to find heat transfer by radiation

Q: Two parallel plates (1mx0.5m) are maintained at uniform temperatures of T₁ = 1000K and T₂ = 500K and…

A: Area of both the plates, A1=A2=1 m* 0.5 m =0.5 m2Temperature of one plate, T1=1000 KTemperature…

Q: Assuming the sun to be a black body emitting radiation with maximum intensity at 1 = 0.48u m,…

Q: A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept in an…

A: Given data: The diameter of the spherical tank is: D=2 m The given temperature of sphere is:…

Q: Two plane disks each 125 cm in diameter are parallel and directly opposite each other. They are…

A: given; diameter of disc (d)=125cm=1.25mseperate distance (l)=50cm=0.5mtemperature of disc A…

Q: The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 um. If…

A: GIVEN DATA - λ1=1.45μm T1=2000K WE HAVE TO CALCULATE TEMPRATURE CORRESPONDING TO 2.90 WAVELENGTH

Q: Consider a 20-cm-diameter spherical ball at 800 K suspended in air as shown in the figure. Assuming…

A: Solution:- Given data: D=20cm T=800K take σ=5.67×10-8w/mLK4 A=4πR2…

Q: A blackbody with a surface area of 1.0 m is subjected to the flow of a 10°C gas where the heat…

A: The total (convection plus radiation) heat transfer from the blackbody is 2616.7 W.

Q: Determine the fraction of the radiation leaving the base of the cylindrical enclosure that escapes…

A: Given data: Radius of the enclosure of surface 1, r1 = 10 cm Length of the enclosure, L = 10 cm…

Q: How does radiosity for a surface differ from the emitted energy? For what kind of surfaces are these…

A: Radiosity is the ration of total radiation energy leaving the surface per unit area. Radiosity is…

Q: A flat-plate collector with one glass cover is placed in horizontal. The absorber plate temperature…

Q: Consider a cylindrical furnace with ro = H = 1 m, as shown in the figure. The top (surface 1) and…

Q: Two parallel planes measuring 1.2 x 1.2 m apart by a distance of 4 cm. The emissivities of the…

A: Given: The distance between two parallel plates is, d=4 cm. The area of the plate is, A=1.2 m×1.2…

Q: Two concentric spheres of diameters D1 = 15 cm and D2 = 25 cm are separated by air at 1 atm…

A: Given data: Diameter of inner sphere, D1= 15 cm Diameter of outer sphere, D2 = 25 cm Pressure of…

Q: Consider a circular grill whose diameter is 0.30 m. The bottom grill is covered with hot coal bricks…

A: given; diameter(d)=0.30mcoal brick temperature(T1)=1100ksteaks initial temperature(T2)=50c…

Q: Q6) A) Determine the view factors F12 and F21 for the very long ducts shown in Figure below without…

Q: Consider a surface at a uniform temperature of 800 K. Determine the maximum ratio of thermal…

Q: An astronaut performing an extra-vehicular activity(space walk) shaded from the Sun is wearing a…

A: Given data: Area of the patch, A = 5 cm×8 cm. The emissivity of the patch, ε = 0.30. The thickness…

Q: A 2-m-internal-diameter double-walled spherical tank is used to store iced water at 0°C. Each wall…

A: Given: The internal diameter of the spherical tank, d1 = 2 m The temperature of the ice stored in…

Q: Two aligned parallel square plates 0.6 m by 0.6 m are separated by L=0.3 m as illustrated in…

A: Heat Transfer: According to the second law of thermodynamics, heat is always transferred from the…

Q: 2. Two very long concentric cylinders of diameters D=0.35 m and D2=0.5 m are maintained at uniform…

Q: Two very large parallel plates are maintained at uniform temperatures T1 = 800 K and T2 = 500 K and…

Q: Consider two coaxial parallel circular disks of equal diameter D = 1 m spaced apart by 1 m, and two…

A: The view factor in the heat transfer theory defines the degree of radiation energy transfer between…

Q: (B) Two parallel plates (1mx0.5m) are maintained at uniform temperatures of T₁ = 1000K and T₂ = 500K…

Q: Consider the right-circular cylinder of diameter D, length L, and the areas A1, A2, and A3…

A: Right circular cylinder: Diameter D Length L Areas A1, A2, and A3 representing the base, inner, and…

Concept explainers

Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

Question

Two parallel concentric disks, 20 cm and 40 cm in
diameter, are separated by a distance of 10 cm. The smaller
disk (« = 0.80) is at a temperature of 300°C. The larger disk
(« = 0.60) is at a temperature of 800°C.
(a) Calculate the radiation view factors.
(b) Determine the rate of radiation heat exchange between
the two disks.
(c) Suppose that the space between the two disks is completely
surrounded by a reflective surface. Estimate
the rate of radiation heat exchange between the two
disks.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 9 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
Two concentric spheres of diameters D1 = 0.3 m andD2 = 0.4 m are maintained at uniform temperatures T1 = 700 Kand T2 = 500 K and have emissivities «1 = 0.5 and «2 = 0.7,respectively. Determine the net rate of radiation heat transferbetween the two spheres. Also, determine the convection heattransfer coefficient at the outer surface if both the surroundingmedium and the surrounding surfaces are at 30°C. Assume theemissivity of the outer surface is 0.35.
An electric hot plate is placed in a room which is maintained at a temperature of 297 K. The plate is maintained at a temperature of 403 K and has an emissivity of 0.8. If the plate surface resembles a circular disc of diameter 250 mm, electrical power consumed by the hot plate will be?
The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 um. If the peak wavelength of emitted radiation changes to 2.90 µm, then the temperature (in K) of the black body is (A) 500 (B) 1000 (C) 4000 (D) 8000
The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 micrometer. If the peak wavelength of emitted radiation changes to 2.90 micrometer, then the temperature (in K) of the black body is (A) 500 (B) 1000 (C) 4000 (D) 8000
An engineer is investigating objects that can be used as a solar collector. One ofthe objects considered is the object made of aluminum and is coated with leadsulfate. Investigation shows that the reflectivity of this object is 0.2 for radiationat wavelengths less than 3.3 μm and 0.95 for radiation greater than 3.3 μm. Inorder to get better insight into the behavior of the object, as a candidate for asolar absorber, the object is then exposed to two different conditions: a solarradiation (T ~ 5800 K) and a room temperature (T ~ 300 K). What is the energyreflected by the object at these two conditions?