An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of T, = 375 K. When placed in atmospheric air at a temperature of T = 300 K and moving with a velocity of V = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m². If a second object of the same shape, but with a characteristic length of L = 5 m, is maintained at a surface temperature of T, = 375 K and is placed in atmospheric air at T = 300 K, what will the value of the average convection coefficient be if the air velocity is V = 20 m/s?

An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of T, = 375 K. When placed in atmospheric air at a temperature of T = 300 K and moving with a velocity of V = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m². If a second object of the same shape, but with a characteristic length of L = 5 m, is maintained at a surface temperature of T, = 375 K and is placed in atmospheric air at T = 300 K, what will the value of the average convection coefficient be if the air velocity is V = 20 m/s?

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: heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building…

A: GIven:L=1 md=100 mmTa=27°C =300 KTs=147°C =420 Kh=10W/m2Kε=0.8Surafce area,A=πdLA=π0.11 =0.314…

Q: 1.A cylinder (D= 0.7 mm, 17 W/m .°C and L=1 m) is placed in an air space To = Tsur = -3 °C. If…

Q: You've experienced convection cooling if you've ever extended your hand out the window of a moving…

A: GIVEN DATA- CONDITION-A T=-5'C , h=40W/m2K CONDITION-B T=10'C , h=500W/m2K SURFACE TEMPRATURE…

Q: Fluid flows over a flat plate, 1.2 m long. The direction of flow is along the length of the plate…

A: Given: Flat plate length = 1.2 m Temperature of plate = 283 K Temperature of fluid = 340 K Velocity…

Q: heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building…

Q: Water at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that…

Q: Problem 1. Consider a 0.8-meter-high and 1.5-meter-wide double-pane window consisting of two…

Q: heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building…

Q: An object of irregular shape has a characteristic length of L=1 m and is maintained at a uniform…

Q: You've experienced convection cooling if you've ever extended your hand out the window of a moving…

A: according to the given question

Q: ttempt please

A: Given-Information:- Vair craft = 120 m/sTair = -8°CTwing = 8°CLc = 2.1 mcf = 0.002h = 12,000 ftp =…

Q: Consider a thin suspended hotplate that measures 0.25 mx 0.25 m. The isothermal plate has a mass of…

Q: Under steady-state conditions, air at a temperature of 20.0°C, pressure of 1.00 atm, and a velocity…

Q: Water at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that…

A: The temperature of the water is .The velocity of water is .The heat generated is The diameter of the…

Q: Required information Hot gas flows in parallel over the upper surface of a 2-m-long plate. The…

A: (u_L) is the velocity of the gas (17 m/s).(L) is the length of the plate (2 m).(\nu) is the…

Q: A fluid with a surface film coefficient of 500 W / ° C flows through a pipe (k = 40 W / m ° C) with…

A: The diagram of the pipe is given as, The heat flow rate from the fluid is written as, The heat…

Q: An uninsulated steam pipe of 100-mm diameter is routed through a building whose walls and air are at…

A: GIven:L=1 md=100 mmTa=27°C =300 KTs=147°C =420 Kh=10W/m2Kε=0.8Surafce area,A=πdLA=π*0.1*1 =0.314…

Q: ! Required information Air flows in a pipe under fully developed conditions with an average velocity…

A: To find: The wall temperature at the exit. Given: The average velocity of the air is vavg=1.25 m/s.…

Q: surface temperature of a 12 m long and a 6-cm-diameter horizontal hot water pipe is 73 ℃. Assume the…

Question

An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of Ts
= 375
K. When placed in atmospheric air at a temperature of T = 300 K and moving with a velocity of V = 100 m/s, the average heat flux
from the surface to the air is 20,000 W/m². If a second object of the same shape, but with a characteristic length of L = 5 m, is
maintained at a surface temperature of Ts 375 K and is placed in atmospheric air at T = 300 K, what will the value of the average
convection coefficient be if the air velocity is V = 20 m/s?
=
h₂ =
=
||
i
W/m².K

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: Given

VIEW

Step 2: Calculation of convective heat transfer coefficient for second object

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 14 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

Thermodynamics problem. A membrane type electrical heater of 20,000 w/m? capacity is sandwiched between an Insulation of 25 mm thickness with thermal conductivity of 0.029 W/m-K and a metal plate with k = 12.6 W/m-K of thickness 15 mm. The convection coefficient is 150 W/m2-K. The surroundings are at 5°C. Determine the surface temperature of the heater and the flow on either side.
The answer options have been included
Required information A rectangular bar with a characteristic length of 0.5 m is placed in a free stream flow where the convection heat transfer coefficients were found to be 100 W/m2.K and 50 W/m2.K when the free stream velocities were 25 m/s and 5 m/s, respectively. If the Nusselt number can be expressed as Nu = C Rem Pr, where C, m, and n are constants. Determine the convection heat transfer coefficient for similar bar where L = 1 m and V = 14 m/s. (Round the final answer to one decimal place.) The convection heat transfer coefficient is 105 W/m²K.
Calculate the convective heat transfer rate via the top and the two side walls of a refrigerated box trailer as shown in the figure. The trailer is cruising at a rate of 70 mph (31.3 m/s). The box trailer dimensions are 16 m long, 4.1 m high, and 2.6 m wide. Assume that the surface of the trailer is at uniform temperature of 10°C. The air temperature is 30°C. Because of the presence of the prime-mover in the front, the air flow can be assumed to be turbulent when it encounters the trailer. 187.4 kW Walls. Prime-mover 16 m 2.6 m
In the arctic sea, the ice sheets are melting. Let's calculate the temperautre distribution in one such ice sheet. The sheet is 2 m thick. Under the sheet there is ice-water mixture and it can be assumed that the temperature of the bottom surface of the ice sheet is approximately 0°C. Air at -20°C is blowing above the sheet. The convection coefficient of air is 15 W/m².K. The thermal conductivity of ice is 2.2 W/m.K. What is the temperautre of icesheet at its center (i.e., at 1 m from the surface)?
heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building whose walls and air are at 27°C. Pressurized steam maintains a pipe surface temperature of 147°C, and the coefficient associated with natural convection is h =10 W/m2.K. The surface emissivity is ɛ= 0.8. What is the rate of heat loss per unit length from the steam line?
2. Consider airflow over a plate surface maintained at a temperature of 215°C. The temperature profile of the airflow is given as T(y) = Too (Too - T,) exp (- V fluid The airflow at 1 atm has a free stream velocity and temperature of 5 cm/s and 25°C, respectively. Determine the heat flux on the plate surface and the convection heat transfer coefficient of the airflow.