b) Two surfaces make up an enclosure where surface 1 is flat and has area A₁, temperature T₁ and emissivity &₁. Surface 2 is black and has temperature T2. Show that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by ₁ (T₁-T₂).

b) Two surfaces make up an enclosure where surface 1 is flat and has area A₁, temperature T₁ and emissivity &₁. Surface 2 is black and has temperature T2. Show that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by ₁ (T₁-T₂).

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.44P

See similar textbooks

Related questions

Q: 4 ) Every temperature measuring instrument makes use of specific physical property in order to…

A: Pt sensor: Pt sensor are the most common type of platinum resistance thermometer. it refers that the…

Q: A bar of a uniform cross-section is rigidly fixed at one end and loaded by an off-centre tensile…

A: “Since you have posted multiple questions, we will provide the solutiononly to the specified sub…

Q: The mass of the suspended weight is 16 kg. Note that point D is the midpoint of bar BE and the…

A: Given data:- The mass of the suspended weight=16 kg. Point D is the midpoint of the bar BE the…

Q: The 2.00-kg slender rod shown is hanging in a vertical position and is pin-supported at point A. The…

Q: 2. Consider the beam ABC from problem 1. Find the stress resultants within the beam at the locations…

Q: inematic frames for the manipulator.

A: Denavit-Hartenberg (DH) is a mathematically representation to write the equation for a manipulator…

Q: Figure shows two steel shafts with the same diameter and weight of 152 lb each. Determine the…

Q: (A simple pendulum). Consider the dynamics of the pendulum depicted below, where u denotes an input…

A: Given: Mass of the rod is M And half length of the rod is L So the total length of the rod is 2L We…

Q: Problem 3: A particle moving along a straight path has an acceleration defined by a = 3.12t² + 0.58…

Q: The lid shown has a mass, m = 60 kg, and is held in position by rod AB. The rod is held in place by…

Q: Explain with necessary diagrams the "Load strain behavior with time" of an Elasto-plastic and…

A: The given graph between load and time shows the sudden loading and holding for some time and then…

Q: part (a) as well, regarding briefly describing the motion of the object.

A: Given: A velocity-time curve To find: Brief description of the motion of the object

Q: 4 3 S +45 +95 +85+ 5 = 0

A: To check: The stability of the system. Given: The characteristic equation is S4+4S3+9S2+8S+5=0.

Q: Saturated steam at 1 atm is condensed on the external surface of a copper tube with an outside…

A: GivenSaturated steam at 1 atm d=16mmt=0.5 mmmw=0.06 kg/sTw1=15oCTw2=60oCh=10 kW/m2KC=4180…

Q: Explain the steps involved in disconnecting a fuel line on a vehicle with: Multiport fuel injection…

A: Question: The steps involved in disconnecting a fuel line on a vehicle with: Multiport fuel…

Q: 22: The springs connecting with a rigid weightless bar as hown. The stiffness of beam (Kb) is 5 kN/m…

A: The stiffness of the beam is kb=5 kN/m. The stiffness of the spring is K=4 kN/m. The bar is…

Q: A 200MW steam power plant operates on a simple Rankine cycle assuming non-ideal isentropic…

Q: Problem 2. If the link CD has an angular velocity of 6 rad's in the direction shown, determine the…

A: Solution: Given Data: *The angular velocity of the link CD is: ωCD=6 rad/s To Find: The angular…

Q: 2.2.8. A closed tank contains a liquid (S. G.= 0.85) under pressure. The pressure gauge, depicted in…

A: In this problem, we will calculate the pressure at the bottom of the tank as well as the height of…

Q: Describe the following homogeneous transformation: T= 1) There is no correct answer. 2) It…

A: Homogeneous Transformation Matrix is a generalised Transformation matrix having 4 sub-matrices.…

Q: A Single Edge Bend sample is tested to determine the fracture toughness of a material. The sample…

A: Given: Width of the specimen→B=35 mm Height of the specimen→W=63 mm So from the figure, the length…

Q: The lifting pulley in Figure Q13 consists of a small crank of diameter d = 0.13 m and a large crank…

Q: Determine the (magnitude) of the moment about line AD of the 750-lb tension in cable CE. Z 3 ft 2 ft…

A: The tensile in cable CE is 750(lb) Find the magnitude of moment about line AD

Q: As shown in the figure, Refrigerant 22 enters the compressor of an air conditioning unit operating…

A: Given that: The refrigerant R22 enters the compressor at: P1 = 80 lbf/in2 and T1 = 40oF. It exits…

Q: SEATWORK: 20 KN/m Rah Rav 1. Solve for the reactions. 9m 60 KN/m Rb

A: Given Data- A simply supported beam given we have to find reaction forces

Q: 1. Find solutions for the divergence and curl of the vector field vat (1, 0, -1). v (x,y,z) = x²z²į…

A: To find: The divergence and curl of the vector field. Given: The vector field is v=x2z2i^+xyzj^+z…

Q: Q2) Suppose two measured quantities x-(2.0=0.2) cm, y-(6.0=0.6) cm. Find z-x-y and its uncertainty…

Q: What are the advantages of using cascade refrigeration? I.Higher required pressure differences for…

A: This question is based on the concept of Cascade Refrigeration system.

Q: Can you explain elastic hysteresis in polymers with the aid of a diagram?

A: Solution: Given Data and to find: Can you explain elastic hysteresis in polymers with the aid of a…

Q: A simple ideal Rankine Cycle operates between the pressure limits of 6969 kPa and 69 kPa. If the…

A: Given data:- A simple ideal Rankine Cycle high pressure (boiler pressure)= 6969 kPa low…

Q: Bottom part only please, Discuss why the petrol engine is irreversible in terms of entropy and work…

A: For any thermodynamic process, if the process is reversible then the change in entropy of any…

Q: The following system is in static equilibrium with the strings AB, BC, and CD connected to support…

A: Given:weight 1, w1=40 Nweight 2, w2=50 N

Q: Compute the total heat gain load from all the sources into the lunchroom, if the lunchroom is…

A: Given: Wall facing SE 20*15, U = 0.3 Btu/hr.ft2.F Roof, U = 0.4 Btu/hr.ft2.F Outside conditions,…

Q: A bead of mass 0.1kg is bound to a linear track which connects the points (1,2,3) and (-1,2,4). The…

A: Given: F = (xy2z, x, z2) Points: (1,2,3) to (-1,2,4) To find: Work done

Q: 5. Saturated water vapor cools down to a temperature such that the piston rests on the stops and the…

A: Plot the process on pv diagram which show the state points relative to the vapor dome.

Q: For the following system, calculate the mode shapes A || Select one: PME ים 1-]י[ ]O Ot ].1 -0.5]' 0…

Q: Water flows at a rate of 0.030 m³/s in a 0.16-m-diameter pipe that contains a sudden contraction to…

A: Flow rate of Flow Q = 0.030 m3/s Diameter of pipe at entrance d1= 0.16 m Diamete of pipe at…

Q: The figure below provides steady-state data for a throttling valve in series with a heat exchanger.…

A: Given Data P1=9 Bar, P2=P3=1 bar, T3=10 C, T5=15C, ,T4=25 C, P4=P5=1 Bar To find T2=? m2=?

Q: Determine the z-coordinate of the mass center of the homogeneous paraboloid of revolution shown. 4…

A: Given Radius is 4 in Height is 10 in Required: mass centre

Q: The Fatigue behaviour of initially crack free aluminium 6061 is shown in Figure Q12. A component…

A: Given: For the life of →N1=100000 cycles of loading, the stress amplitude is: →σ1=150 MPa And for…

Q: Determine the magnitude of the force which member CD exerts on the pin at C. A 126% B 0.72 m 0.54 m…

A: Given Data- a plane frame given we have to find force exerted by member CD at pin C

Q: Steam at a pressure of 0.08 bar and a quality of 87.4% enters a shell-and-tube heat exchanger where…

A: Given that: Inlet condition of steam are, P1 = 0.08 bar and x1 = 87.4 %. Steam exits as saturated…

Q: Which of the following assumptions about equipment in a Rankine Cycle FALSE? a.Streams entering…

A: To choose: The incorrect option. Concept used: Rankine cycle: It is an ideal cycle for a steam power…

Q: place the tyemang on the pipe assembly by meant force Faend le moment Ma, s pot On shown in F…

Q: An initially empty rigid container has a volume of 200 L. It is then filled with water from a line…

A: In this problem, we will first compute the ultimate mass of the water and then the entropy…

Q: 04: A: Derive an expression for the maximum blade efficiency of reaction turbine. B: Explain and…

Q: An ideal Carnot heat pump operates from a low temperature reservoir T₁=281.2 K and supplies 5.91 kW…

A: Given data:- An ideal Carnot heat pump low temperature reservoir (TL)=281.2 K high temperature…

Q: Question: A rope with two mass-less platforms at its two ends passes over a fixed pulley, as shown…

A: A rope with two mass-less platforms at its two ends passes over a fixed pulley It has a disc with a…

Q: P9. The forward transfer function of a unity feedback type 1, the second-order system, has a pole at…

A: Since you have asked multiple questions, we will solve the second question for you (first question…

Q: * A refrigerator uses refrigerant - 134s as a working fluid and operates on a ideal vapour…

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

b)
Two surfaces make up an enclosure where surface 1 is flat and has area A₁,
temperature T₁ and emissivity &₁. Surface 2 is black and has temperature T2₂. Show
that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by
₁0(T₁-T₂).

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

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

Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.
Ex1. A thin-walled cubical container that is 0.5 m by 0.5 m by 0.5 m is filled with ice water. The container is inside another .cubical container and the 3 cm gap between the containers is a vacuum. The outer surface of the inner container has an emissivity of 0.1 and a temperature of 1 C. The inner surface of the outer container has an emissivity of 0.3 and a temperature of 19 C. (a) What is the rate of heat transfer to the ice water? (b) If the container initially contains 1/2 ice and 1/2 water by volume, how long will it take for all the ice to be melted?
Two parallel discs pf 1m diameter are situated 2m part in surroundings at a temparature 20 C. The inner side of one disc has an emissivity of 0.5 and is manintained at 500 C by electric resistance heating and the outer side of the disc is well insulated. The other disc is Two parallel discs of 1m diameter are situated 2m apart in surroundings at a temperature of 20 oC. The inner side of one disc has an emissivity of 0.5 and is maintained at 500 oC by electric resistance heating and the outer side of the disc is well insulated. The other disc is open to radiation on both sides and reaches an equilibrium temperature. Calculate this equilibrium temperature and the heat flow rate from the first disc, assuming heat transfer is entirely by radiation.
b) Two parallel square plates having 5 mm separation with each plate having 2 m2 area. One of the plates has a surface temperature of 800 K and surface emissivity of 0.6, while the other has a temperature of 300 K and surface emissivity of 0.9. Find the net energy exchange by radiations between the plates
At midday when a black paved airport runway is directly under the Sun, it receives 800 W of solar power per square meter of surface from the Sun. If this hot surface loses energy only by radiation back into the atmosphere, what is its equilibrium temperature (in K)? You may use an emissivity of e = 1 for a black surface
Molten metal at 2000 C is poured using crucible. The liquid metal jet has a diameter of 3 mm with an insulation shield of 5 cm diameter. There is a slit of 30 degrees around the insulation shield. The temperature inside the room is 30 C and the shield is 700 C. Assuming black bodies, find the net heat transfer between jet and shield, jet and room, shield and the room. One of the steps is wrong A) Resistance network is required to be built B) To find the view factor between metal and shield , ratio of the angles is used C) View factors are one of the most important steps to solve the problem D) None of the above E) Slit doesnot participate in radiation
a) Explain how Fourier's law of conduction (in one-dimensional cartesian system) can be applied to experimentally measure the thermal conductivity of solid materials. What are the necessary conditions and assumptions? b) Two surfaces make up an enclosure where surface 1 is flat and has area A₁, temperature T₁ and emissivity &. Surface 2 is black and has temperature T2. Show that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by ε₁0 (T₁ - T₂).
Two parallel plates 0.5 m by 1.0 m are spaced 150 mm apart. One plate is maintained at 1,000 C and the other at 500 C. The emissivities of the plates are 0.20 and 0.50, respectively. The plates exchange heat with each other and only the plate surfaces facing each other are to be considered in the analysis. Find the net heat transfer rate to each other. Neglect other modes of heat transfer (conduction and convection). View Factor is based on the case shown below:
A thin square steel plate, 10 cm on the side, is heated in a blacksmiths forge to a temperature of 800°C. if the emissivity is 0.60, what is the total rate of radiation of energy in Watts?
Two infinite black plates of 800deg C and 340 deg C exchange heat through radiation. Calculate the heat exchange. Round your answer to 4 decimal places.
A 3x3m plate at 500 degC is suspended vertically in a very large room. The plate has an emissivity of 0.13, The room is at 25degC. What is the net heat transfer from the plate?