Answered: Compare the different heat flux…

Compare the different heat flux resulting from conduction through 1 in. of the follow· ing materials when subjected to a 30"F temperature difference: copper, steel, wood, glass fiber.

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.38P

See similar textbooks

Related questions

Q: Use Double Integration Method in finding for the deflection at midspan.

Q: 4. A self-supported steel plate of 8 cm thickness and an initial temperature of 20°C passes through…

Q: Create the missing view given the two completed views. The frontvis missing for A, Top for B, and…

A: According to the two orthographic views of a projection, the third projection view is drawn with the…

Q: Com Posit Wall K₁=20₂ K₂=30₂ K3=40 w/mc at Steries repectively Thickness for at three layer are…

Q: i cant read this, can you rewrite

Q: 23 The pressure drop Ap in a pipe of diameter D and length 1 d. p and viscosity µ of fluid flowing,…

A: Given∆P pressure drop (N/m2)D diameter mL length mρ density kg/m3μ viscosity N s/m2 V mean…

Q: kinematic equations how do these equations formulated?

A: To be derived:-kinematic equations

Q: When force P is apliced to the rigid arm BC, point B moves downward 0.2mm. Determine the enlongation…

Q: Topic: Work-Energy Principle Subject: Dynamics of Rigid Bodies A 0.2-kg bob rests on a spring that…

A: Givenm=0.2kgx=0.2mk=1000N/m

Q: For a steel element with a 0.2% steel characteristic, a stress test was applied and the analysis of…

A: Stress (ksi) Strain 0 0 30 0.001 55 0.002 60 0.005 68 0.01 72 0.02 74 0.04 75 0.06…

Q: The shaft of the motor M turns with an angular velocity w = 100(4+t) rad/s, where t is in seconds.…

Q: An example of two types of stress?

Q: trying to calculate the moment of inertia of a sphere. When I calculate moment of inertia by using…

Q: A perfectly insulated system contains 2 ft3 of hydrogen at 75 F and 90 psia, which receives an input…

Q: The fin array shown below consists of 25 cylindrical pin-fins on a 10-mm thick, 50-mm x 50-mm base…

Q: A golfer is attempting to reach the elevated green by hitting his ball under a low-hanging branch in…

A: Given Data The velocity of the ball is: v=107 mi/hr=156.933 ft/s The distance of the ball is: x=16…

Q: b) Outline the differences between Fig. Q4(i) and Fig. Q4(ii). Fig. Q4(i) Fig. Q4(ii)

A: As there are Two Types of Manufacturing Processes. 1.Additive Manufacturing( Adding the material)…

Q: Water is the working fluid in an ideal regenerative Rankine cycle with one closed feedwater heater.…

Q: Water is the working fluid in a regenerative Rankine cycle with one open feedwater heater. Steam…

Q: Water is the working fluid in an ideal regenerative Rankine cycle with one closed feedwater heater.…

Q: In traveling a distance of 3.9 km between points A and D, a car is driven at 93 km/h from A to B for…

A: Given data: d=3.9 kmvAB=93 km/h=25.833 m/svCD=51 km/h=14.2 m/stBC=6 sec Need to determine the time…

Q: The resistance force R of a supersonic plane during flight can be considered as dependent upon the…

Q: Fluid (S = 1.5) drains from a large enclosed tank. The outlet is 2 m below the fluid upper surface.…

A: Given data:- specific gravity of fluid (S)=1.5 height of the free surface (h)=2m To find:- Velocity…

Q: Water is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater…

A: Given: P1=1400 lbf/in2, T1=1000P2=P3=P4=500 lbf/in2P5=140 lbf/in2P6=5 lbf/in2Net power…

Q: The 18-kg block A slides on the surface for which μk = 0.3. The block has a velocity v = 10 m/s when…

A: Given data: mA=18 kgμk=0.3v=10 m/ss=4 mmB=11 kgk=1200 N/me=0.6 Need to determine the compression in…

Q: In the configuration shown, all members are at a uniform temperature and ABCD is vertical. Then the…

A: Draw the diagram of link ABCD after heating and cooling the FC and EB respectively.

Q: In the arctic sea, the ice sheets are melting. Let's calculate the temperautre distribution in one…

A: Given: L = 2 m T1 = 0oC T∞ = -20oC h = 15w/m2K K = 2.2 w/m.k

Q: What is the specific brake work (kJ/kgfuel) of a 4 L single-cylinder propane engine operating…

A: Solution: Given Data: (a) Q.=17 kWmf.=1.2 g/s (b) φ=0.8Q-=3.4×105 kJ/kmolfuel

Q: Vhat is the accuracy for the given scale in meter (m)? 0 0.5 1.0 1.5 2.0 cm

A: Given,

Q: A straight-tapered flying-wing aircraft has the following characteristics: span, 20 ft; area, 100…

A: Let us consider the Mach number to be M = 0.25 Standard atm data is to be used to estimate the flow…

Q: Com Posit Wall K₁=20₂ K₂=30 K3=40 w/mc at Steries repectively Thickness for at three layer are 0.2m.…

Q: UB ag B h = 4 m/s, 2 m/s²

A: Given,

Q: 22 A partially submerged body is towed in water. The resistance R to its motion depends on the…

A: Given DataResistance -RDensity-ρVelocity-Vlength -lAcceleration due to gravity -g

Q: with an initial velocity vA = 12 A pitching machine throws the 0.5-kg ball toward the wall m/s as…

A: Introduction With the use of Newton's equation of motion, we will determine the speed at which the…

Q: The composition of a symmetric composite wall is shown in figure below hi 7 T1 1 2 Brick Brick Brick…

A: Given; k1=k5=0.026 W/m°Ck2=k4=0.22 W/m°Ch2=25026 W/m2°Ch1=10026 W/m2°CT∞1=20°CT∞2=100 °C Let the…

Q: A projectile is launched from point A with speed vo = 34 m/s. Determine the value of the launch…

A: For the given projectile motion, initial velocity is 34 m/s. It is required to determine the launch…

Q: 7- Illustrates a composite wall. The wall is composed of two materials (A with kA = 1 W/m-K and B…

A: Introduction Using the Fourier rule of heat transport, we will determine the total thermal…

Q: Sketch the internal shear and moment as a function of the beam length (triangle denotes a pin…

Q: 2. At the moment shown, the horizontal platter rotates with a counterclockwise angular velocity of…

Q: Draw the following shapes. 50 25 50

A: Given

Q: Statement: At any point in a body subjected to load, therer are different stresses or cominations of…

A: the above statement is abosuloutely correct when a body is subjected to load different stress…

Q: The 12-lb collar B is at rest, and when it is in the position shown the spring is unstretched.…

Q: 8-Consider a 0.8 m high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of…

Q: In case of emergency, the gas actuator is used to move a 50-kg block B by exploding a charge C near…

Q: Express the system of forces shown below as an equivalent force couple system at A. A is located at…

A: Given: The force at B in y-direction= 2.5 kN The force at D in z-direction = 0.5 kN The force at B…

Q: Two particles with massess of 12 lbm are 1.2 ft apart. Find the gravitational force that acts on…

A: Mass of the two particles is given as 12 lbm. Distance between the two particles is 1.2 ft. It is…

Q: A particle moving in the x-y plane has a velocity v = 8.58i + 2.14j m/s at a certain instant. If the…

Q: A turning operation is performed on C1008 steel (a ductile steel) using a tool with a nose radius=…

Q: Water is the working fuld In an Ideal Rankine cycle. Steam enters the turbine at 1400 lb/in² and…

A: Dear student, I have used the data from the initial 3 sub parts to calculate the last part.

Q: A placekicker is attempting to make a 59-yard field goal. If the launch angle of the football is…

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Compare the different heat flux resulting from conduction through 1 in. of the follow·
ing materials when subjected to a 30"F temperature difference: copper, steel, wood,
glass fiber.

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

Given data

VIEW

Final solution

VIEW

Step by step

Solved in 2 steps with 1 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

2.45 Heat is transferred from water to air through a brass wall . The addition of rectangular brass fins, 0.08 cm thick and 2.5 cm long, spaced 1.25 cm apart, is contemplated. Assuming a water-side heat transfer coefficient of and an airside heat transfer coefficient of , compare the gain in heat transfer rate achieved by adding fins to (a) the water side, (b) the air side, and (c) both sides. (Neglect temperature drop through the wall.)
Water at a temperature of 77C is to be evaporated slowly in a vessel. The water is in a low-pressure container surrounded by steam as shown in the sketch below. The steam is condensing at 107C. The overall heat transfer coefficient between the water and the steam is 1100W/m2K. Calculate the surface area of the container that is required to evaporate water at a rate of 0.01 kg/s. Problem 1.16
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
10.8 The heat transfer coefficient of a copper tube (1.9-cm II) and 2.3-em OD) is on the inside and on the outside, but a deposit with a fouling factor of (based on the tube outside diameter) has built up over time. Estimate the percentage increase in the overall heat transfer coefficient if the deposit were removed.
Estimate the rate of heat loss per unit length from a 5-cm ID, 6-cm OD steel pipe covered with high-temperature insulation having a thermal conductivity of 0.11 W/(m K) and a thickness of 1.2 cm. Steam flows in the pipe. It has a quality of 99% and is at 150C. The unit thermal resistance at the inner wall is 0.0026(m2K)/W the heat transfer coefficient at the outer surface is 17W/(m2K) and the ambient temperature is 16C.
2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is to be a stainless steel wire having an electrical resistivity of ohm-centimeter. The operating temperature of the stainless steel is to be no more than 1260°C. The heat transfer coefficient at the outer surface is expected to be no less than in a medium whose maximum temperature is 93°C. A transformer capable of delivering current at 9 and 12 V is available. Determine a suitable size for the wire, the current required, and discuss what effect a reduction in the heat transfer coefficient would have. (Hint: Demonstrate first that the temperature drop between the center and the surface of the wire is independent of the wire diameter, and determine its value.)
3.14 A thin-wall cylindrical vessel (1 m in diameter) is filled to a depth of 1.2 m with water at an initial temperature of 15°C. The water is well stirred by a mechanical agitator. Estimate the time required to heat the water to 50°C if the tank is suddenly immersed in oil at 105°C. The overall heat transfer coefficient between the oil and the water is , and the effective heat transfer surface is .
One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?
A high-speed computer is located in a temperature-controlled room at 26C. When the machine is operating, its internal heat generation rate is estimated to be 800 W. The external surface temperature of the computer is to be maintained below 85C. The heat transfer coefficient for the surface of the computer is estimated to be 10W/m2K. What surface area would be necessary to assure safe operation of this machine? Comment on ways to reduce this area.
Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are those of the air on the left and right sides of the wall and that the convection heat transfer coefficients on the left and right surfaces are 6 and 10W/m2K, respectively.
1.41 A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and , corresponding to fluid temperatures of 92 and 32°C, respectively. Assuming that the thermal conductivity of the wall is , (a) compute the surface temperatures in °C and (b) calculate the heat flux in .
2.15 Suppose that a pipe carrying a hot fluid with an external temperature of and outer radius is to be insulated with an insulation material of thermal conductivity k and outer radius . Show that if the convection heat transfer coefficient on the outside of the insulation is and the environmental temperature is , the addition of insulation actually increases the rate of heat loss if , and the maximum heat loss occurs when . This radius, is often called the critical radius.