1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Grace [21]
3 years ago
10

Liquid water enters a valve at 300 kPa and exits at 275 kPa. As water flows through the valve, the change in its temperature, st

ray heat transfer with the surroundings, and potential energy effects are negli-gible. Operation is at steady state. Modeling the water as incompress-ible with constant rho= 1000 kg/m3, determine the change in kinetic energy per unit mass of water flowing through the valve, in kJ/kg
Engineering
1 answer:
Elan Coil [88]3 years ago
3 0

Answer:

The change in kinetic energy per unit mass of water flowing through the valve is - ΔKE = 0.025 KJ/Kg

Explanation:

Knowing

-Fluid is air

-inlet 1: P1 = 300 kPa

-exit 2: P2 = 275 kPa

density - rho= 1000 kg/m3

Using the formula

Δh = cΔT + Δp/rho

as change in temperature is neglected then change in enthalpy becomes

Δh = Δp/rho

energy equation could be defined by

Q - W = m(out) [h(out) V^{2}(out)/2 + g Z(out)] - m(in) [h(in) V^{2}(in)/2 + g Z(in)]

Q - W = m2 [h2 V^{2}2/2 + g Z2] - m1 [h1 V^{2}1/2 + g Z1]

as for neglecting potential energy effects

Q - W = m2(h2) - m1(h1)

as the system is adiabatic and has no work done

0 = m2 [h2 V^{2}2/2] - m1 [h1 V^{2}1/2]

from mass balance m1 = m2

0 = [h2 V^{2}2/2] - [h1 V^{2}1/2]

Change in kinetic energy could be defined by

ΔKE = V^{2}2/2 - V^{2}1/2

Change in specific enthalpy could be defined by

Δh = h2 - h1

Then the change in kinetic energy per unit mass of water flowing through the valve could be calculated as following

ΔKE = -Δh = ΔP/rho

-(275 - 300)/1000 = 0.025 KJ/Kg

- ΔKE = 0.025 KJ/Kg

You might be interested in
A force is a push or pull in? A.a circle B.an arc C.a straight line
Salsk061 [2.6K]

Answer:

I think it is B: an arc

Explanation:

Hope this helps. Mark as brainiest

8 0
3 years ago
Here you go!!!!!!!!!!!!!!!!!1
sweet [91]

Answer:

Im confused, what does this mean

Explanation:

i mean, thx lol

3 0
3 years ago
Please solve part two
Burka [1]

Answer:

Wat part 2

Explanation:

7 0
3 years ago
Why is it reasonable to say that no system is 100% efficient?​
Virty [35]

Generally, frictional losses are more predominant for the machines being not 100% efficient. This friction leads to the loss of energy in the form of heat, into the surroundings. Some of the supplied energy may be utilised to change the entropy (measure of randomness of the particles) of the system.

5 0
3 years ago
A tank with a volume of 8 m3 containing 4 m3 of 20% (by volume) NaOH solution is to be purged by adding pure water at a rate of
lawyer [7]

Answer:

The time necessary to purge 95% of the NaOH is 0.38 h

Explanation:

Given:

vfpure water(i) = 3 m³/h

vNaOH = 4 m³

xNaOH = 0.2

vfpure water(f) = 2 m³/h

pwater = 1000 kg/m³

pNaOH = 1220 kg/m³

The mass flow rate of the water is = 3 * 1000 = 3000 kg/h

The mass of NaOH in the solution is = 0.2 * 4 * 1220 = 976 kg

When the 95% of the NaOH is purged, thus the NaOH in outlet is = 0.95 * 976 = 927.2 kg

The volume of NaOH in outlet after time is = 927.2/1220 = 0.76 m³

The time required to purge the 95% of the NaOH is = 0.76/2 = 0.38 h

4 0
3 years ago
Other questions:
  • To ensure safe footing on penetrable surfaces,use?
    5·1 answer
  • A cylindrical specimen of brass that has a diameter of 20 mm, a tensile modulus of 110 GPa, and a Poisson’s ratio of 0.35 is pul
    13·1 answer
  • The mechanical properties of a metal may be improved by incorporating fine particles of its oxide. Given that the moduli of elas
    11·1 answer
  • Three return steam lines in a chemical processing plan enter a collection tank operating at a steady state at 1 bar. Steam enter
    11·1 answer
  • 6. Staples are the most common item used to secure and support cables in residential wiring.​
    14·1 answer
  • Which of the following is an example of a social need?
    5·1 answer
  • Of the core elements of successful safety and health programs, Management Leadership, Worker Participation, and what else relate
    10·2 answers
  • Somebody help me!! It’s due today
    9·1 answer
  • Should i show my face?
    8·2 answers
  • Which term describes the lowest of a foundation?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!