A 3-m long and 0.4-cm-thick cast iron (k= 52 W/m ·°C) steam pipes of outer diameter 10 cm are connected to each other through two 1-cm-thick flanges of outer diameter 20 cm. The steam flows inside the pipe at an average temperature of 200°C with a heat transfer coefficient 180 W/m² ·°C. The outer surface of the pipe is exposed to an ambient at 12°C, with a heat transfer coefficient of 25 W/m² ·°C. (a) Disregarding the flanges, determine the average outer surface temperature of the pipe. (b) Using this temperature for the base of the flange and treating the flanges as fins, determine the fin efficiency and the rate of heat transfer from the flanges. (c) What length of pipe is the flange section equivalent to for heat transfer purposes?

A 3-m long and 0.4-cm-thick cast iron (k= 52 W/m ·°C) steam pipes of outer diameter 10 cm are connected to each other through two 1-cm-thick flanges of outer diameter 20 cm. The steam flows inside the pipe at an average temperature of 200°C with a heat transfer coefficient 180 W/m² ·°C. The outer surface of the pipe is exposed to an ambient at 12°C, with a heat transfer coefficient of 25 W/m² ·°C. (a) Disregarding the flanges, determine the average outer surface temperature of the pipe. (b) Using this temperature for the base of the flange and treating the flanges as fins, determine the fin efficiency and the rate of heat transfer from the flanges. (c) What length of pipe is the flange section equivalent to for heat transfer purposes?

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.4P

See similar textbooks

Related questions

Q: A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now…

A: Write the given data:

Q: Consider a steel pan used to boil water on top of an electric range. The bottom section of the pan…

A: Given that, Thickness of bottom of pan, L=0.5 cm,Diameter of the pan, d=25 cm,Consumption of heat…

Q: To warm up some milk for a baby, a mother pours milk into a thin-walled cylindrical container whose…

A: Write the given information. Write the expression of the film temperature. Write the properties of…

Q: A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at…

Q: 3. A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover…

A: Data given -

Q: Q:A hot surface at 100°C is to be cooled by attach- ing 3-cm-long, 0.25-cm-diameter aluminum pin…

Q: Find the center temperature of the cylindrical block after 19.1 min.

A: for cylinder block - h= 5cmd=5cmfor cylinder

Q: A pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kg/s.…

A: Convection heat transfer take place bw solid boundary and flowing fluid. It is of two types:- 1)…

Q: A hollow tube (inner radius = 40 mm) is heated by a constant surface heat flux of 34 W/m2. A fluid…

Q: Consider a stainless steel spoon (k = 15 W/m·K) partially immersed in boiling water at 95°C in a…

Q: A hot surface at 100°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter copper pin fins (k =…

A: a) Heat transfer rate formula for fin is used to arrive the solution. b) effectiveness is calculated…

Q: Brass plate of 6 cm thickness that are initially at 25 °C are heated by passing it through an oven…

Q: cylindrical fuel rod (k = 30 W/m•K) of 2 cm in diameter is encased in a concentric tube and cooled…

A: Given data is

Q: determine the rate of flow through the boiler

A: Given data; L1=20×10-3 mk1=58 W/m0cL2=5×10-3mk2=0.116 W/m0cT1=3000CT2=500C Therefore find rate of…

Q: A cylindrical fuel rod of 2 cm in diameter is encased in a concentric tube and cooled by water. The…

A: Given data:

Q: A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at…

Q: Consider a 25-m-long thick-walled concrete duct (k 5 0.75 W/m·K) of square cross section. The outer…

A: Given:Length of the duct, L=25 mThermal conductivity, k=0.75 W/m.KOuter dimensions,Ao=20 cm X 20…

Q: Consider a 1.5-m-high electric hot-water heater that has a diameter of 40 cm and maintains the hot…

Q: I just took a water bottle out of my refrigerator (0₁ = 3°C) and placed it on the kitchen counter.…

A: The given information in the problem is shown in the following attached image:

Q: H.W. Q:A hot surface at 100°C is to be cooled by attach- ing 3-cm-long, 0.25-cm-diameter aluminum…

A: Given data:

Q: A 300-ft-long section of a steam pipe whose outer diameter is 4 in passes through an open space at…

A: Given data as per question Length of pipe = 300 ft Price of natural gas = $1.10 /therm Outer surface…

Q: An ice chest whose outer dimensions are 30 cm*40 cm*40 cm is made of 3 cm thick Styrofoam (k = 0.033…

A: Given data, The outer dimensions of ice chest is 0.3×0.4×0.4 in m Thickness of ice chest, t = 0.03 m…

Q: A pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kg/s.…

A: Write the differential equation for the steady state one dimension heat conduction.

Q: A pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kg/s.…

A: Step 1:Step 2: Step 3: Step 4:

Q: A wall with a thermal conductivity of 0.50W/m·K is maintained at 40.0°C. The heat transfer through…

A: The temperature at the outside surface is 36.67 ℃.

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

100%

A 3-m long and 0.4-cm-thick cast iron (k= 52 W/m ·°C) steam
pipes of outer diameter 10 cm are connected to each other
through two 1-cm-thick flanges of outer diameter 20 cm. The
steam flows inside the pipe at an average temperature of 200°C
with a heat transfer coefficient 180 W/m² ·°C. The outer surface
of the pipe is exposed to an ambient at 12°C, with a heat transfer
coefficient of 25 W/m² ·°C. (a) Disregarding the flanges,
determine the average outer surface temperature of the pipe. (b)
Using this temperature for the base of the flange and treating the
flanges as fins, determine the fin efficiency and the rate of heat
transfer from the flanges. (c) What length of pipe is the flange
section equivalent to for heat transfer purposes?

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

Step 5

Step 6

Trending now

This is a popular solution!

Step by step

Solved in 6 steps with 9 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

Please solve this question, thank you very much
The gas at an average temperature of 160 oC is carried through a steel (steel=46 W/m2.K) pipe with an inner diameter of 9.2 cm and an outer diameter of 11.0 cm. The pipe is first covered externally with insulation material with a thermal conductivity coefficient of k=0.0623 W/m.K in 4 cm thickness and then with another material with a thermal conductivity coefficient of k=0.047 W/m.K in 3 cm thickness. The individual convective heat transfer coefficient on the gas side inside the pipe is 63 W/m2.K, and the individual convective heat transfer coefficient on the atmospheric air side outside the pipe covered with insulation material is 37 W/m2.K. Since the temperature of the atmospheric air where the pipe is located is 23 oC; a) Calculate the heat transferred per unit pipe length, b) the interface temperatures between the layers.
To cool a storehouse in the summer without using a conventional air-conditioning system, the owner decided to hire an engineer to design an alternative system that would make use of the water in the nearby lake. The engineer decided to flow air through a thin smooth 10-cm-diameter copper tube that is submerged in the nearby lake. The water in the lake is typically maintained at a constant temperature of 15°C and a convection heat transfer coefficient of 1000 W/m2?K. If air (1 atm) enters the copper tube at a mean temperature of 30°C with an average velocity of 2.5 m/s, determine the necessary copper tube length so that the outlet mean temperature of the air is 20°C.
What’s the correct answer for this please?
Water (5.2 L'min) is flowing in a tube "D-3 cm, L- 5 m" and is to be heated from 15 C to 59.9°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? If turbulent flow use Dituss-Boetler relation Nu- 0.023 Re Pr. ed 2.00 08 on Properties : p= 992.1 kg/m , C,-4179 J/kg. C, k= 0.631 W/wm°C, Pr = 4.32, v = 0.658E-6 Select one: O A 20.55 O B. 17.63 O.19.17 O D. 14.58 O E. 16.13
Consider a 25-m-long thick-walled concrete duct (k 50.75 W/m·K) of square cross section. The outer dimensionsof the duct are 20 cm 3 20 cm, and the thickness of the ductwall is 2 cm. If the inner and outer surfaces of the duct are at100°C and 30°C, respectively, determine the rate of heat transferthrough the walls of the duct.
The exhaust gases of an automotive engine leave the combustion chamber and enter a 8-ft-long and 3.5-in-diameter thin-walled steel exhaust pipe at 800°F and 15.5 psia at a rate of 0.05 lbm/s. The surrounding ambient air is at a temperature of 80°F, and the heat transfer coefficient on the outer surface of the exhaust pipe is 3 Btu/h?ft2?°F. Assuming the exhaust gases to have the properties of air, determine (a) the velocity of the exhaust gases at the inlet of the exhaust pipe and (b) the temperature at which the exhaust gases will leave the pipe and enter the air.
Determine the length of the pipe required to cool the pasteurized orange juice from 65 to 22 °C at a rate of 1500 kg/hr in a 3 cm diameter pipe . The stream of chilled water is flowing from 4 to 20 °C, against the direction of the orange juice. The overall coefficient of heat transfer from the water to the orange juice is 900 J/m2s °C and the specific heat of the orange juice is is 3890 J/kg °C .
Consider water is flowing through a pipe with a 10 cm diameter at a flow rate of 0.2 kg/s. The inlet mean temperature of the water is 25 °C. If the wall of the pipe is heated with an electric resister generating heat at a rate of 5 kW and maintaining a uniform wall heat flux, determine the average convective heat transfer coefficient between water and wall of the pipe. The properties of water at this temperature are given as; specific heat capacity Cp = 4.18 kJ/kg-K, thermal conductivity k = 0.607 W/m- K, Density p = 997 kg/m³, and kinematic viscosity v = 8.9 x 10- 7 m²/s.
In a power plant, pipes transporting superheated vapor are very common. In a certain plant, superheated vapor is flowing at a rate of 0.3 kg/s inside a 5 cm diameter pipe of 10 m length. The air in the plant is maintained at 20oC while the surface temperature of the pipe is 100oC. If the temperature drop between the inlet and exit of the pipe is 30oC and the specific heat capacity of the vapor is 2190 kJ/kg.K, determine the convective heat transfer coefficient at the pipe surface. If necessary, how could this coefficient be increased?
Please solve this prob, Thank you
Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a 25-m section of a pipe that has an outer diameter of 5 cm. The pipe extends 2 m in the ambient air above the ground, dips into the ground (k= 1.5 W/m-°C) vertically for 3 m, and continues horizontally at this depth for 20 m more before it enters thenext building. The first section of the pipe is exposed to the ambient air at 8°C with a heat transfer coefficient of 22 W/m2.°C. If the surface of the ground is covered with snow at 0°C, determine: (a) Heat loss from the part of the tube that is on the ground. (b) Heat loss for vertical part of the tube. The shape factor, and the rate of heat loss on the horizontal part that is in the ground. (d) Total rate of heat loss from the hot water. (e) The temperature drop of the hot water as it flows through this 25-m section of the wall.