Q5. A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100 C. It is now exposed to an air stream at 25°C with a heat transfer coefficient of 200 W/m K. How long would it take for the copper road to cool to an average temperature of 35°C? D=2 cm T,= 100 °C Figure Q5

Q5. A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100 C. It is now exposed to an air stream at 25°C with a heat transfer coefficient of 200 W/m K. How long would it take for the copper road to cool to an average temperature of 35°C? D=2 cm T,= 100 °C Figure Q5

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: 1. A stainless steel cylindrical shaft of 25-cm-diameter comes out of an oven at a uniform…

A: GivenD=0.25mTi =800°CT∞=150°Ch=80W/m2

Q: A ball with diameter D = 5 cm and with initial temperature 0 °C is to be exposed to air at 33°C, h =…

Q: A short bronze cylinder of diameter 6 cm and length 12 cm is initially at 40°C and then plunged into…

A: During unsteady heat transfer, it is not the only temperature of the body that keeps on changing…

Q: Indirect Cooling With Liquid Nitrogen. You are designing a system to cool an insulated silver plate…

Q: 2. A 12 cm diameter long bar initially at a uniform temperature of 40C is placed in a medium at 650C…

Q: Question 2 Steam at 320ºC flows in a stainless steel pipe, whose inner and outer diameters are D₁ =…

Q: Consider a 120 mm stainless steel plate (K=45w/m. °C, p=7800kg/m, Cp=50OJ/kg. °C) initially at a…

Q: A cylindrical rod of stainless steel is insulated on its exterior surface except for the ends. The…

Q: Q4: A spherical object that is made of a material with specific heat-383 J/kg.K, and density 8954…

A: Given:Specific heat of material,C=383JKgDensity of material,ρ=8954Kgm3(Copper)Diameter of…

Q: Q11/ To heat treat alloy rods, these are placed in a gas stream at 800°C with a convective heat…

Q: We are testing a thin, transparent film heater that is bonded to the inside of an automobile window…

A: Thickness of atuomobile window, t=3 mmSurface area of window, A=0.6 m2Air temperature inside the…

Q: Heat Transfer Mechanisms 5- In a certain experiment, cylindrical samples of diameter 4 cm and length…

Q: Q2: A hot surface at 150°C is to be cooled by attaching 4- cm-long, 0.3-cm-diameter aluminum pin…

Q: ady-state condition dT K = 30W/m2; T1=85°C %3D dx A(AT)= 30W/ m² ; T1=85°C (AT)= 15W/ m²; T=85°C…

A: GivenA=2m2t=20mmQ=30WT1=85oC

Q: A spherical object that is made of a material with specific heat=383 J/kg.K, and density = 8954…

Q: In steady state, the heat transfer coefficient "k" is L=0.5 m Left face temperature of infinitely…

A: Given data as per questionT=250°Ch=40W/mKL=0.5mk=10W/mkqu=5×104W/m3

Q: Two coaxial spheres with diameters of 15 cm and 25 cm were separated by air at 1 atm pressure. two…

Q: A 5.0-cm-thick plate (k =20 W/m.°C) has heat generated uniformly at the rate of 5×10 W/m³. One side…

Q: A spherical pellet (ρ =1000 kg/m3 , c = 1000 J/(kg⋅K)) with a radius ro = 1 cm is cooled from an…

A: Given Data ρ =1000 kg/m3 , c = 1000 J/(kg⋅K) ro = 1 cm h = 100 W/(m2 K) Ans(a) k = 0.1 W/(m⋅K)…

Q: Consider the base plate of a 1200-W household iron that has a thickness of L = 0.5 cm, base area of…

A: Given: Q = 1200 W L = 0.5 cm A = 300 cm2 k = 15 W/mK

Q: Consider a 1.2 m*2 m glass window of 6 mm thick having k=0.75 W/mK, which is exposed to environment…

A: The sloution is given in next step

Q: Steel balls 12 mm in diameter are annealed by heating to 1200 K and then slowly cooling to 350 K in…

A: Given :The diameter of the steel balls is The initial temperature is The final temperature is The…

Q: Q2) Water at a temperature of T1 = 4°C flows in a cylindrical pipe. On a winter day, the outside air…

A: Given data:- The inner radius of the cylinder pipe ri= 8 cm Inside cylinder pipe temperature T∞1=40C…

Q: A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue.…

Q: Steel balls (diameter = 21 mm, p = 7833 kg/m , k = 54 W/M•°C, Cp =p.45 kJ/kg-°C, and a = 1.474x10 m…

Q: J 6 A semi-infinite solid, with a boundary condition of convection on the surface (Tfluid = 100°, h…

A: Given:The temperature of the fluid, The convective heat transfer coefficient, At time , the uniform…

Q: Steel balls (diamęter 21 mm, p=7833 kg/m, k 54 W/m-°C, Cp= 0.465 kJ/kg-°C ɑ = 1.474x10 m /s) are…

Q: A copper sphere of 18 mm diameter (density = 8960 kg/m3 and CP= 0.38 kJ/kg K) is exposed to air at…

A: Diameter of copper sphere, D=18 mmDensity of copper, ρ=8960 kg/m3Cp=0.38 kJ/kg.KAir Temperature,…

Q: 5. A large block of steel is placed inside of a furnace set at 1980°C. If it is assumed that the…

A: Given problems are related to the transient heat conduction problems where temperature of body…

Q: A family is preparing dinner and a pizza is being toasted in an oven whose wall is ma a 0.5-cm-thick…

A: Given:Thickness of steel layer, ts=0.5cmheat transfer coefficient for steel, ks=15 W/m.Kheat…

Q: A composite wall constructed of 2.5cm of steel (k-60.5 W/m-K) and 5.0 cm of aluminum (k177W/m-K)…

Q: Q5 Two large containers A and B of the same size are filled with different fluids. The fluids in…

Q: cm square and the height of the block is 6 cm. We place this blo Find the rate of heat loss from…

Q: the surface temperature of the steel instantly takes on ace and remains constant, what is the time…

A: Given data as per question A large block of steel is placed inside of a furnace of…

Q: Steel balls (diameter 21 mm, p 7833 kg/m', k 54 W/m:°C, Cp 0.465 kJ/kg.°C, and a = 1.474x10 m/s) are…

A: We will use lumped parameter analysis for this problem critical length Lc = Volume / area =Diameter…

Q: EXAMPLE I Aspherical container of inner radius rl 2 m, outer radius r2 2.1 m. and thermal…

A: (Example 1) Given: The inner radius of spherical container, r1 = 2 m The outer radius of spherical…

Q: Steam at 320°C flows in a stainless steel pipe (k-15W/mK) whose inner and outer diameter are 5cm and…

A: Note: As per the policy, we can solve the first three subparts. Please, resubmit the remaining…

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

A: Given Thickness, d = 8 cm = 0.08 m Initial temperature, Ti = 20oC Convective…

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

Q5. A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now exposed
to an air stream at 25°C with a heat transfer coefficient of 200 W/m K. How long would it take for the
copper road to cool to an average temperature of 35°C?
D=2 cm
T,= 100 °C
Figure Q5

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 4 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. An 18-cm-long, 16-cm-wide, and 12-cm-high metal block (p = 8000 kg/m', c, = 400 J/kg°C, k=200 W/mK) initially at 20 °C is placed in an oven at 600 °C for heat treatment. The heat transfer coefficient on the surface of the block is 40 W/m "C. How long time is required for the iron block to reach a temperature of 400 °C? 1321 35°C Güneş 1407 20021
10-What is the maximum temperature is aplane wall 8 cm thick in which that is generated uniformally at the rate 1000 W/m3 >>If one side is maintained at 20 C and the other side at 100 C ..Kw=1.5 W/mC.
A long rod with a thermal conductivity of 1 W / m · K is subjected to the boundary conditions given in the figure. Find the temperature distribution in the steady state with the energy balance method for ∆x = ∆y = 0.2m. Also calculate the heat transfer between rod and fluid per unit length.
Steel balls (diameter = 21 mm, p = 7833 kg/m , k = 54 W/m•°C, Cp = 0.465 kJ/kg.°C, and a = 1.474x10 m /s) are annealed by heating them first to 870°C in a furnace and then allowing them to cool slowly to 85°C in ambient air at 27°C. What is the total rate of heat %3D transfer from the balls to the ambient air, when 2367 balls are to be annealed per hour (kW)? Select one: A. 11.15 B. 9.12 C. 9.85 D. 8.38 E. 10.50
Q3. A small electric heating application uses wire of 2 mm diameter with 0.8 mm thick insulation (k = 0.15 W/m°C). The heat transfer coefficient (ho) on the insulated surface is 31 W/m2°C. Determine the critical thickness of insulation in this case and the percentage change in the heat transfer rate if the critical thickness is used, assuming the temperature difference between the surfaces of the wire and surrounding air remains unchanged. - Wire Insulator air 12 0.8 mm
Not sure where I went wrong on this please show a drawing also
Design a solar chimney to cover 75% of total heating losses, where U value for the chimney=0.5 W/m2.K and the total wall area of the spaces equal 70m2 and the temperature outside are 5oC at night and 8oC at day and the temperature for the interior is 24 oC.
4. A self-supported steel plate of 8 cm thickness and an initial temperature of 20°C passes through a convective oven at a temperature of 1980°C. What is the core temperature of the plate after 2 minutes? Given: h= 500 w/mk, Ksteel = 63.9W/m k, Csteel = 434 J/m k, Psteel = 7832 kg/m³, Osteel = 18.8 x 10-6 m²/s, Neglect Radiation (State all assumptions and Show All Work)
Please help with assumptions and fbd
Steel cubes 10 mm in width are annealed by heating to 1,377 K and then slowly cooling to 469 K in an air environment for which T∞ = 301 K and h = 24 W/m2-K. Assuming the properties of the steel to be k = 24 W/m · K, ρ = 7,047 kg/m3, and c = 916 J/kg · K, estimate the time required for the cooling process.
Heat Transfer A wall of an oven with a wire in it. Across the wire a voltage of 50 Volts and a current of 2 Amps is applied, and 80% of the electrical power is converted to thermal energy. The oven is a convection oven and has air flowing through it at 240 C and h = 10 W/m^2 K. The wall of the oven is 0.1 m thick and 1.5 m tall and 1.5 m wide and is made of steel (k = 15 W/m K). Find the surface energy balance on the inner wall of the oven and determine the temperature of the ineer wall at steady state. Then do an energy balance on the outer wall, assume that the oven is free standing and has an emissivity, e = 0.6, and the surrounding temperature is 25 C. The air in the surrounding has a convective heat transfer coefficient of 25 W/m^2 K. Just set up the balance equation that would enable to solve, no need to actually solve.