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andrew-mc [135]
3 years ago
7

The diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any wo

rk or heat interactions. Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90°C. (Page 216).
Engineering
1 answer:
WINSTONCH [101]3 years ago
3 0

Answer:

V₂=43.58 m/s

Explanation:

Given that

P₂=200 KPa

T₂=90°C

V₂=? m/s ( exit speed)

T₁=30°C

P₁=100 KPa

V₁=350 m/s

We know that

Heat capacity for air Cp=1.005 KJ/kg.k

We know that for air change in enthalpy only depends only on temperature

Now from first law for open system

h_1+\dfrac{V_1^2}{2000}=h_2+\dfrac{V_2^2}{2000}+W

1.005\times 303+\dfrac{350^2}{2000}=1.005\times 363+\dfrac{V_2^2}{2000}

1.005\times 303+\dfrac{350^2}{2000}-1.005\times 363=\dfrac{V_2^2}{2000}

\dfrac{V_2^2}{2000}=0.95

V₂=43.58 m/s

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Answer: the thermal conductivity of the sample is 22.4 W/m . °C

Explanation:

We already know that the thermal conductivity of a material is to be determined by ensuring one-dimensional heat conduction, and by measuring temperatures when steady operating conditions are reached.

ASSUMPTIONS

1. Steady operating conditions exist since the temperature readings do not change with time.

2. Heat losses through lateral surfaces are well insulated, and thus the entire heat generated by the heater is conducted through the samples.

3. The apparatus possess thermal symmetry

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The electrical power consumed by resistance heater and converted to heat is:

Wₐ = V<em>I</em> = ( 110 V ) ( 0.4 A ) = 44 W

Q = 1/2Wₐ = 1/2 ( 44 A )

Now since only half of the heat generated flows through each samples because of symmetry. Reading the same temperature difference across the same distance in each sample also confirms that the apparatus possess thermal symmetry. The heat transfer area is the area normal to the direction of heat transfer. which is the cross- sectional area of the cylinder in this case; so

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dmitriy555 [2]

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4 0
3 years ago
2 times 4 - 3 times 5​
Papessa [141]

Answer:

<h3>The answer is - 7</h3>

Explanation:

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Answer:

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6 0
3 years ago
I just wanted to say thanks you to Brainly. This website is a huge help!
Fantom [35]

THANKS BRAINLY <3

Explain : I've got a lot of help from this website :D

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