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gulaghasi [49]
4 years ago
14

A furnace wall is to be built of 20-cm firebrick and building (structural) brick of same thickness. The thermal conductivities o

f fire brick and building brick are 1.6 and 0.7 W/m.K , respectively. The inner surface of the firebrick is at 980 °C, the outer surface of the structural brick is at 30 °C. The heat flux and the temperature of the brick interface are..
Engineering
1 answer:
Norma-Jean [14]4 years ago
6 0

Answer:

q=2313.04W/m^2

T=690.86°C

Explanation:

Given that

Thickness t= 20 cm

Thermal conductivity of firebrick= 1.6 W/m.K

Thermal conductivity of structural brick= 0.7 W/m.K

Inner temperature of firebrick=980°C

Outer temperature of structural brick =30°C

We know that thermal resistance

R=\dfrac{t}{KA}

These are connect in series

R=\left(\dfrac{t}{KA}\right)_{fire}+\left(\dfrac{t}{KA}\right)_{struc}

R=\dfrac{0.2}{1.6A}+\dfrac{0.2}{0.7A}\ K/W

R=\dfrac{23}{56A}\ K/W

Heat transfer

Q=\dfrac{\Delta T}{R}

Q=56A\times \dfrac{980-30}{23}\ W

So heat flux

q=2313.04W/m^2

Lets temperature between interface is T

Now by equating heat in both bricks

\dfrac{980-T}{\dfrac{0.2}{1.6A}}=\dfrac{T-30}{\dfrac{0.2}{0.7A}}

So T=690.86°C

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What is referred to as "Pyroelectric" materials?
aliina [53]

Answer and Explanation:

Pyroelectric material

Pyroelectric materials have special property of generating potential difference (although it is very less ) when these material are treated with heat or when celled down.

The potential difference generated is for very less time

The generation of potential difference is due to change in position of atoms after heating or cooling.

5 0
3 years ago
The thrust F of a screw propeller is known to depend upon the diameter d,speed of advance \nu ,fluid density p, revolution per s
musickatia [10]

Answer:

<em>screw thrust = ML</em>T^{-2}<em> </em>

Explanation:

thrust of a screw propeller is given by the equation = pV^{2}D^{2} x \frac{ND}{V}Re

where,

D is diameter

V is the fluid velocity

p is the fluid density

N is the angular speed of the screw in revolution per second

Re is the Reynolds number which is equal to  puD/μ

where p is the fluid density

u is the fluid velocity, and

μ is the fluid viscosity = kg/m.s = ML^{-1}T^{-1}

<em>Reynolds number is dimensionless so it cancels out</em>

The dimensions of the variables are shown below in MLT

diameter is m = L

speed is in m/s = LT^{-1}

fluid density is in kg/m^{3} = ML^{-3}

N is in rad/s = LL^{-1}T^{-1} =

If we substitute these dimensions in their respective places in the equation, we get

thrust = ML^{-3}(LT^{-1}) ^{2}L^{2}\frac{T^{-1} L}{LT^{-1} }

= ML^{-3}L^{2}T^{-2}

<em>screw thrust = ML</em>T^{-2}<em> </em>

This is the dimension for a force which indicates that thrust is a type of force

6 0
3 years ago
Shelly cashman word 2016 module 2 - project a pdf - does anyone have the fished paper
JulijaS [17]

Answer:

GETTING STARTED

Open the file SC_WD16_2a_FirstLastNamedocx, available for download from the SAM website.

Save the file as SC_WD16_2a_FirstLastNamedocx by changing the “1” to a “2”.

If you do not see the .docx file extension in the Save As dialog box, do not type it. The program will add the file extension for you automatically.

With the file SC_WD16_2a_FirstLastNamedocx still open, ensure that your first and last name is displayed in the footer.

If the footer does not display your name, delete the file and download a new copy from the SAM website.

PROJECT STEPS

For your Written Communication class, you are writing a short research paper. To conform to MLA guidelines, modify the document’s Normal style by changing the font to Times New Roman, the font size to 12 pt., and the line spacing to double with no blank space after paragraphs.

Apply the modified Normal style to the first four paragraphs in the document, from “Crystal Mathison” to “15 October 2018”.

Center the title paragraph “A Solution to Food Deserts: Micro Farms”.

Insert a header as follows:

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Right-align the header paragraph.

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Close Header & Footer Tools.

Create a First Line indent of 5″ for the body paragraphs beginning with “In the United States…” and ending with “…avenues for profitable enterprises.”

the Citations & Bibliography Style of the document to MLA.

In the sentence “In the United States…fresh fruits and vegetables.”, move the insertion point before the period and insert a citation to a new source using the information shown in Figure 1 below. (Hint: The Tag name is intentionally blurred because it is generated automatically.)

Insert a citation to the existing Johnson source before the period in the third sentence, “Most food deserts are in cities such as…Oklahoma City.”

In the fourth sentence of the first body paragraph, “However, living in…fresh food options.”, use the Thesaurus to replace the word “assure” with a more common synonym that starts with the letter “g”.

In the second paragraph, find the sentence “The aim is…growth.” Move the insertion point before the period and insert a citation to a new source using the information shown in Figure 2 on the next page. (Hint: The Tag name is intentionally blurred because it is generated automatically.)

Figure 2: Article in a Periodical Source

To provide additional information at the end of the second paragraph, move the insertion point immediately after the period in the sentence “…fruit trees and bushes.” and insert a footnote with the following text:

Such practices are called companion planting.

Modify the Footnote Text style by changing its font size to 12 pt. and the line spacing to double.

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Cut the paragraph “Micro farms include private gardens…goods for sale and profit.” and then paste it so it becomes the third body paragraph in the document.

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Update the bibliography field so the Works Cited list reflects the edit you made to the Harris source.

Check the Spelling & Grammar in the document to identify and correct any spelling errors. (Hint: Ignore names. You should find and correct at least one spelling error.)

Your document should look like the Final Figure on the following pages. Save your changes, close the document, and then exit Word. Follow the directions on the SAM website to submit your completed project.

5 0
3 years ago
Plot the data as impact energy versus temperature: (b) Determine a ductile-to-brittle transition temperature as the temperature
Shkiper50 [21]

Question:

The following tabulated data were gathered from a series of Charpy impact tests on a commercial low-carbon steel alloy.

Temperature(∘C)50403020100-10-20-30-40Impact energy (J)76767158382314951.5

(a) Plot the data as impact energy versus temperature.

(b) Determine a ductile-to-brittle transition temperature as the temperature corresponding to the average of the maximum and minimum impact energies.

(c) Determine a ductile-to-brittle transition temperature as the temperature at which the impact energy is 20 J.

Answer:

a)  see the attached graph

b) max E = 76 and Min E =1.53 average = 77.5/2 = 38.75 J

this corresponds to about 10° C

c ) at E = 20 J temperature is about -2°C

8 0
4 years ago
Read 2 more answers
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bazaltina [42]

Answer:

b. satellite surveying

c. aerial surveying

d. optical tooling

e. marketing surveying

f. control surveying

h. statistical surveying

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m. solar surveying

Explanation:

A Survey is an act of examination of the features of a subject or material under consideration. Land surveying refers to the examination of the natural and man-made features of a piece of land using scientific and mathematical methods.

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5 0
3 years ago
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