5. (25%) A frustum of a cone has its base heated as shown in Figure 2. The topsurface is held at 1200K while the side is perfectly insulated. Surfaces 1, 2, and 3are assumed gray and diffuse. What are the temperatures of surface 1 and 2? If theemissivity of surface 2 changes from 0,8 to 0.6, will the temperature of surface 2change to different value? The radius of upper circle is 1 m and the radius oflower circle is 3 m. The height of frustum is 4 m.Surface 3T= 1200K8 = 0.8Surface 1Surface 2q= 100W/m?8 = 0.6Perfectly insulatedɛ = 0.8

Answered: Surface 3 T= 1200K E = 0.8 %3D Surface…

Engineering

Mechanical Engineering

Surface 3 T= 1200K E = 0.8 %3D Surface 1 Surface 2 q= 100W/m? E = 0.6 Perfectly insulated E = 0.8

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 11.29P

See similar textbooks

Related questions

Q: A themal micro-sensor made of polysilicon is illustrated in Figure below. It consists of a circular…

Q: A wall of house may be approximated by 5.5 in layer of brick flowed by 3 in asbestos layer. what…

Q: Find the equivalent conduction resistance of the wall illustrated below. 0.5 m? Im? |(A) (C) |(D)…

Q: Using a conductor with a length of 17 cm and magnet with a field strength of 0.1856 T, find the…

A: Givenl=17cm=0.17mB=0.1856 Tv=23.77 m/sn=4Asked∈=?Formula∈=nBhv

Q: An array of 190 electrical components, each dissipating P = 35 W, are attached to the bottom surface…

Q: A mass of 1019Kg is supported by two wires A and B each made of a different material. Before loading…

A: Given : The mass of the body, m = 1019 kg The diameter of wire A , dA = 1 mm The dimeter of wire B ,…

Q: 10 N/m, k-5 N/m, x 0.01 m, X0= V- Va 0 m/s. Figure 3.1

A: For solution refer below images.

Q: When the cold junction of a thermocouple thermometer is at 0°C and the hot junction at 100 °C, the…

A: It is known that for a thermocouple , the output voltage is given by V0 = S∆Twhere V0: output…

Q: What is the average thermal conductivity for the composite material shown? 7 cm 4 cm 10 cm 1 2 3…

A: As per given question We have to determine average thermal conductivity for the composite material

Q: Determine the resistance of an aluminium coil of 183 cm as diameter consists of 13600 turns and the…

A: Given data: Diameter of aluminium coil d=1.83 m number of turns n=13600 Mean length per turn l=35.24…

Q: A solid body of length L with a rectangle cross section has a temperature distribution equals to: T…

Q: Find the width of a heavy-single ply leather belt (8.75 hp/in) transmitting 11 hp at 1800 rpm motor…

A: Given, Heavy - Single ply leather belt Power, p = 11hp; Speed of the motor, N = 1800 RPM cm =0.696…

Q: What is the length of a copper tube with the heat loss of 500 Watts? A hot liquid which is 40℃ flows…

A: Find the length of copper tube.

Q: Question 2 A steel railroad rails 10 m long are laid with clearance of 3 mm at a temperature of…

Q: A point-focus concentrating solar collector comprising 490 heliostats and a central receiver atop a…

Q: A rectangular fin (k= 180 W/M••C): with AC=0.003 m2 , P =2 m and L 0.07 m protrudes from a wall. The…

Q: T, = 25°C, U = 1.0m/s Known: Electric current passes through a thin flat foil heater A=0.25m? with…

Q: Example: current of 200 A is passed through a stainless-steel wire [k = 19 W/m · ◦C] 3 mm in…

Q: A conducting bar of uniform cross-section lies along the x-axis, with its ends at x= 0 and x = 1.…

Q: A point-focus concentrating solar collector comprising 490 heliostats and a central receiver atop a…

A: TO DETERMINE:- (a) Total aperture area of the heliostat field (b) Collector useful heat output rate…

Q: The steel plate shown below is put in into a rigid chamber, such that spacings of size s = 0.00188…

A: Write the expressions of normal strains. εx=1Eσx-νσy0.001884=1200×109σx-0.28σyσx-0.28σy=94×106…

Q: [wo thick-walled cylinders are mated with no gap or interference. Initial he inner cylinder has an…

Q: Find the value of shape factor F, for cylindrical cavity of diameter 10 cm and height 15 cm as show…

Q: 5) In a resistance microwelding process, the applied voltage is 3.5 V and overall contact resistance…

Q: A steel pipe (outer diameter D=6-cm, and k=53-W/m.K) is to be insulated with insulation…

Q: A bimetallic strip is used as a sensor. The strip has a length of 20 μm. The width of the strip is…

Q: A wall for a tunnel consists of a 4 layers of different materials as shown in Figure Q1(b). The…

Q: Show that in the (S' o T) ZT = K statement showing the performance of the thermoelectric device, Z…

A: Write the given formula for the performance of the thermoelectric device and define the variables.…

Q: to an internal uniform 10 x 106 W/m³. One s ner side is subjected to r coefficient h = 40 W/m e…

Q: Q4/ Write the nodal equation for nodes 1 through 9 shown in Figure h=25 W/m2-°C T-5°C 1 3 T= 100°C…

A: since left wall is insulated the temperature of left wall in steady state will be = 100C…

Q: The engineering constants for an orthotropic material are found to be Ej= 27.579 GPa E2=20.684 GPa…

Q: An exterior wall of a house may be approximated by a 4-in layer of common brick [k =0.7 W/m · ◦C]…

Q: Determine the resistance of an aluminium coil of 140 cm as diameter consists of 15800 turns and the…

A: GIVEN THAT : aluminium coil diameter (d) = 140 cm N = 15800 turns mean length per turn (Lm) =…

Q: the resistance of the coil.

A: Given: n= 2000 d=2.5 mm= 0.0025 m l=80 cm =0.8 m ρ=0.02 μΩm=0.02×10-6 Ωm To determine: The…

Q: For a conductive wire with length L=1cm,w=1mm, h=1mmunder uniaxial strain, the resistance change is…

A: According to the information we have a Uniaxial strain that is e=1 and the Poisson’s ratio is n= 0.3…

Q: 3) The deflecting torque in a spring-controlled instruments is 1.2 x 10–4 kgm for a deflection of…

Q: Q1: A copper cable is 2 km long and has across-sectional area of 10 mm?. Find its resistance at 80°C…

A: Given Data Length of the copper cable, L=2Km Area=10 mm2.=10-5 m2 ρ20°C=0.02×10-6 α=0.004/°C t1=20°C…

Q: A house's exterior wall consists of 15 cm layer of brick (k = 0.75 W/m-°C) followed by 4 cm layer of…

Q: A loop antenna of area A = 3.98 cm2 and resistance R = 6.41 µn is perpendicular to a uniform…

A: Find the thermal energy produced.

Q: 10 N-m SN 45°. 50° F1 150 mm 30 E

A: Given Data :- F=8N AB= 450mm BC=325 mm and rest of data is in diagram.

Q: Find the minimum amount of diameter for the insulation of a cylindrical electrical cable? Radius of…

A: Answer- Not sufficient information.

Q: B. k/p.Cp D. p.Cp/k he end insulated fin are: В. To at x-0 dT -kA dx

A: introduction : here we answered first three part

Q: .0124 W/cm-K. It has the shape of a rectangular bar with cross sectional area of 1 cm2and length of…

Q: Q1. For a transistor as shown in figure.1, find maximum allowable power dissipation Note: - give all…

A: Given, Emissivity, ε = 0.8Diameter, D= 12mmLength, L=10mmHeat transfer coefficient,…

Q: Determine the reactions at the supports. E is constant.

A: Uniformly distributed load, P=3K/ftLength of the beam , L=10 ft

Q: p(x) = po sin () E, A L Figura 6: Problema 6

A: For solution refer below images.

Q: A pipe line used to transport oil from one area in Dubai to Kuwait carrying a temperature of 30℃ of…

Q: Two long straight aluminum wires, each of diameter 0.40 mm, carry the same current but in opposite…

A: Given dataDiameter of each wire d = 0.40mmLength of the wires L = 1mAngle between the string with…

Q: A rock 10 cm long and 2 cm^2 in cross section lows 0.0080cm/sec of 2.5 cp oil under a 1.5 atm…

Q: If you know that the beam linear attenuation coefficient for an attenuator is (0.597 cm-1), the beam…

A: Given: The value of beam linear attenuation coefficient for an attenuator=0.597 cm-1

Concept explainers

Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.

Question

5. (25%) A frustum of a cone has its base heated as shown in Figure 2. The top
surface is held at 1200K while the side is perfectly insulated. Surfaces 1, 2, and 3
are assumed gray and diffuse. What are the temperatures of surface 1 and 2? If the
emissivity of surface 2 changes from 0,8 to 0.6, will the temperature of surface 2
change to different value? The radius of upper circle is 1 m and the radius of
lower circle is 3 m. The height of frustum is 4 m.
Surface 3
T= 1200K
8 = 0.8
Surface 1
Surface 2
q= 100W/m?
8 = 0.6
Perfectly insulated
ɛ = 0.8

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

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 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

A tungsten filament is heated to 2700 K. At what wavelength is the maximum amount of radiation emitted? What fraction of the total energy is in the visible range (0.4to0.75m)? Assume that the filament radiates as a graybody.
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.
Derive the expression for radiation heat exchange between two gray surfaces connected by single refractory surface.
Under steady state operation, a 50 W incandescent light bulb has a surface temperature of 135°C when the room air is at a temperature of 25°C. If the bulb may be approximated as a 60 mm diameter sphere with a diffuse, gray surface of emissivity 0.8, what is the radiant heat transfer from the bulb surface to its surroundings?
Two parallel gray planes have emissivities of 0.8 and 0.7 and are maintained at 800°C and 1500°C. What is the net radiation energy exchange? What would be the reduction in heat transfer if radiation shield of polished aluminums =0.04 is placed between them.
Question No.13: a) What is a gray body? Derive the expression for radiation heat exchange between two gray surfaces connected by single refractory surface. b) A 60mm thick plate with a circular hole of 30mm diameter along the thickness is maintained at uniform temperature of 277°C. Find the loss of energy to the surroundings at 20°C, assuming that the two ends of the hole to be as parallel discs and the metallic surfaces and surroundings have black body characteristics.
Two concentric spheres of diameter D1= 0.9 m and D2= 1.2 m are separated by an air space and have surface temperatures of T1= 400 K and T2= 300 K. (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? q12= Enter your answer for part (a) in accordance to the question statement W (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ε1= 0.5 and ε2= 0.05, in W? q12= Enter your answer for part (b) in accordance to the question statement W (c) What is the net rate of radiation exchange if D2 is increased to 20 m, with ε2= 0.05, ε1= 0.5, and D1= 0.9 m, in W? q12= Enter your answer for part (c) in accordance to the question statement W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (ε2= 1.0) and with ε1= 0.5, D2= 20 m, and D1= 0.9 m, in W? q12= Enter your answer for part(d) in accordance to the question statement W
Two parallel gray planes that are very large have emissivities of ε1 = 0.8 and ε2 = 0.7; surface 1 is at 1100°F (866.5 K) and surface 2 is at 600°F (588.8 K). Use SI units for the following: (a) What is the net radiation from 1 to 2? (b) If the surfaces are both black, what is the net radiation?
Liquid oxygen is stored in a thin-walled, spherical container 0.8 m in diameter, which is enclosed within a second thin-walled, spherical container 1.4 m in diameter. The opaque, diffuse, gray container surfaces have an emissivity of 0.05 and are separated by an evacuated space. If the outer surface is at 275 K and the inner surface is at 95 K, what is the mass rate of oxygen lost due to evaporation, in kg/s? (The latent heat of vaporization of oxygen is 2.13 × 105 J/kg.)
Earth absorbs solar energy and radiates infrared energy. The intensity of the solar radiation incident on earth is J = 1350 Wm-2, also known as the solar constant. Assume earth’s surface (ground) temperature to be uniform at Ts, and that the ground and atmosphere are black (emissivity = 1) for infrared radiation. The radius of the earth is 6.378 x 106 m. The diagram shows the ground at the surface temperature Ts and the atmosphere, represented as a thin black layer, at temperature Ta . Suppose the atmosphere absorbs 100% of the infrared radiation emitted by the ground. Assume that the ground absorbs 47.5% of the incident solar energy, and that the atmosphere absorbs 17.5% of the incident solar energy (for a total of 65% absorbed by the planet). Calculate the "steady state” numerical values of the earth’s ground temperature Ts and the atmospheric temperature Ta taking into account the “greenhouse effect” of atmospheric infrared absorption and emission described above.
Charge-coupled device (CCD) image sensors, which are common in modern digital cameras, respond differently to light sources with different spectral distributions. Daylight and incandescent light may be approximated as a blackbody at the effective surface temperatures of 5800 K and 2800 K, respectively. Determine the fraction of radiation emitted within the visible spectrum wavelengths, from 0.40 mm (violet) to 0.76 mm (red), for each of the lighting sources.
Light from an ideal spherical blackbody 15.0 cm in diameteris analyzed by using a diffraction grating that has 3850 lines/cm.When you shine this light through the grating, you observe that thepeak-intensity wavelength forms a first-order bright fringe at +-14.4from the central bright fringe. (a) What is the temperature of the blackbody?(b) How long will it take this sphere to radiate 12.0 MJ of energyat constant temperature?