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Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 w...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 w...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 where 0 is the angle away from the normal to the surface. (a) What is the hemispherical total emissivity of the surface? (b) What is the hemispherical- hemispherical total reflectivity of this surface for diffuse incident radiation (uniform incident intensity)? (c) What is the hemispherical-directional total reflectivity for diffuse incident radiation reflected into a direction 75° from the normal?
Problem 4...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 w...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 where 0 is the angle away from the normal to the surface. (a) What is the hemispherical total emissivity of the surface? (b) What is the hemispherical- hemispherical total reflectivity of this surface for diffuse incident radiation (uniform incident intensity)? (c) What is the hemispherical-directional total reflectivity for diffuse incident radiation reflected into a direction 75° from the normal?
Problem 4...
Problem 6 (10 рoints) A gray surface has a directional total emissivity that depends on angle of incidence as E(0) 0.78...
Problem 6 (10 рoints) A gray surface has a directional total emissivity that depends on angle of incidence as E(0) 0.788 cos 0. Uniform radiant energy from a single direction normal to the cylinder axis is incident on a long cylinder of radius R. What fraction of energy striking the cylinder is reflected? What is the result if the body is a sphere rather than a cylinder? Qincident R All problems taken from John Howell, M. Minar Mengüc, and Robert...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as sh...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as shown in the figure. The properties are (a) What is the hemispherical emissivity of this surface? (b) If the energy from a directions, what fraction of the incident energy is absorbed by this surface? (c) If the surface is placed in a very cold environment, at what rate must energy be added per unit area to maintain the surface temperature at 1000...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as sh...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as shown in the figure. The properties are (a) What is the hemispherical emissivity of this surface? (b) If the energy from a directions, what fraction of the incident energy is absorbed by this surface? (c) If the surface is placed in a very cold environment, at what rate must energy be added per unit area to maintain the surface temperature at 1000...
Measurement of the spectral, directional absorptivity of a certain non-reflecting surface shows that directional and spectral...
Measurement of the spectral, directional absorptivity of a
certain non-reflecting surface shows that directional and spectral
dependencies may be model as the product of two independent
functions:
This surface is irradiated by diffuse blackbody radiation at a
temperature of 5800 K. Note that the intensity of ideal radiation
can be calculated at Ib=
Eb/pi(W/m2 -sr). The surface is at a uniform
temperature of 300 K.
Determine the rate that energy is absorbed by the surface
(W/m2 )
Determine the net...
PLEAS SHOW all work and EXPLAIN all steps THANK YOU - A small, opaque, diffuse object...
PLEAS SHOW all work and
EXPLAIN all steps THANK YOU
- A small, opaque, diffuse object at T, 400 K is sus- pended in a large furnace whose interior walls are at Tf = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 12. 0.7 0.5 0 1 3 a (um) (a) Determine the total emissivity and absorptivity of the surface....
Step 2 What is the total power received by the detector from a small, deep hole...
Step 2
What is the total power received by the detector from a small,
deep hole drilled in the block, in W?
Step 3
What is the reflectivity of the block surface?
Step 4
What is the radiosity of the surface, in W/m2?
Step 5
What is the total power received by the detector from the small
area on the block surface, in W?
A small anodized aluminum block at 45°C is heated in a large oven whose walls are...
The spectral distribution of the radiation emitted by a diffuse surface may be approximated as fellows...
The spectral distribution of the radiation emitted by a diffuse surface may be approximated as fellows . 200 100 10 15 20 (a) What is the total emissive power? (b) What is the total intensity of the radiation emitted in the normal direction and at an angle of 30° from the normal? (c) Determine the fraction of the emissive power leaving the surface in the direction π/4 θ Tt/2.
2. A small surface of area A measurements the total intensity associated with emission in the normal direction is In 10...
2. A small surface of area A measurements the total intensity associated with emission in the normal direction is In 103 m2 is known to emit diffusely, and from 7000 W/m2-s. Radiation emitted from the surface is intercepted by two other surfaces of area A2 A3 = 103 m2, which are oriented as shown. What is intensity associated with emission in each of the two directions? What are the solid angles subtended by the three surfaces when viewed from Ai?...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 where 0 is the angle away from the normal to the surface. (a) What is the hemispherical total emissivity of the surface? (b) What is the hemispherical- hemispherical total reflectivity of this surface for diffuse incident radiation (uniform incident intensity)? (c) What is the hemispherical-directional total reflectivity for diffuse incident radiation reflected into a direction 75° from the normal?
Problem 4...
Problem 4 (10 points) The directional total absorptivity of a gray surface is given by the expression a(0) 0.450cos20 where 0 is the angle away from the normal to the surface. (a) What is the hemispherical total emissivity of the surface? (b) What is the hemispherical- hemispherical total reflectivity of this surface for diffuse incident radiation (uniform incident intensity)? (c) What is the hemispherical-directional total reflectivity for diffuse incident radiation reflected into a direction 75° from the normal?
Problem 4...
Problem 6 (10 рoints) A gray surface has a directional total emissivity that depends on angle of incidence as E(0) 0.788 cos 0. Uniform radiant energy from a single direction normal to the cylinder axis is incident on a long cylinder of radius R. What fraction of energy striking the cylinder is reflected? What is the result if the body is a sphere rather than a cylinder? Qincident R All problems taken from John Howell, M. Minar Mengüc, and Robert...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as shown in the figure. The properties are (a) What is the hemispherical emissivity of this surface? (b) If the energy from a directions, what fraction of the incident energy is absorbed by this surface? (c) If the surface is placed in a very cold environment, at what rate must energy be added per unit area to maintain the surface temperature at 1000...
Problem 5 (10 points) A gray surface has a directional emissivity isotropic with respect to circumferential angle as shown in the figure. The properties are (a) What is the hemispherical emissivity of this surface? (b) If the energy from a directions, what fraction of the incident energy is absorbed by this surface? (c) If the surface is placed in a very cold environment, at what rate must energy be added per unit area to maintain the surface temperature at 1000...
Measurement of the spectral, directional absorptivity of a
certain non-reflecting surface shows that directional and spectral
dependencies may be model as the product of two independent
functions:
This surface is irradiated by diffuse blackbody radiation at a
temperature of 5800 K. Note that the intensity of ideal radiation
can be calculated at Ib=
Eb/pi(W/m2 -sr). The surface is at a uniform
temperature of 300 K.
Determine the rate that energy is absorbed by the surface
(W/m2 )
Determine the net...
PLEAS SHOW all work and
EXPLAIN all steps THANK YOU
- A small, opaque, diffuse object at T, 400 K is sus- pended in a large furnace whose interior walls are at Tf = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 12. 0.7 0.5 0 1 3 a (um) (a) Determine the total emissivity and absorptivity of the surface....
Step 2
What is the total power received by the detector from a small,
deep hole drilled in the block, in W?
Step 3
What is the reflectivity of the block surface?
Step 4
What is the radiosity of the surface, in W/m2?
Step 5
What is the total power received by the detector from the small
area on the block surface, in W?
A small anodized aluminum block at 45°C is heated in a large oven whose walls are...
The spectral distribution of the radiation emitted by a diffuse surface may be approximated as fellows . 200 100 10 15 20 (a) What is the total emissive power? (b) What is the total intensity of the radiation emitted in the normal direction and at an angle of 30° from the normal? (c) Determine the fraction of the emissive power leaving the surface in the direction π/4 θ Tt/2.
2. A small surface of area A measurements the total intensity associated with emission in the normal direction is In 103 m2 is known to emit diffusely, and from 7000 W/m2-s. Radiation emitted from the surface is intercepted by two other surfaces of area A2 A3 = 103 m2, which are oriented as shown. What is intensity associated with emission in each of the two directions? What are the solid angles subtended by the three surfaces when viewed from Ai?...
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