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3 years ago

In the hydrodynamic entrance region of a pipe with a steady flow of an incompressible liquid

Engineering

2 answers:

Yakvenalex [24]3 years ago

6 0

Answer:

D. The maximum velocity decreases with distance from the entrance.

Explanation:

This is because over time, the pressure with with the incompressible liquid enters decreases with distance from the entrance

Contact [7]3 years ago

6 0

Answer:

C. The maximum velocity increases with distance from the entrance

Explanation:

As the fluid particles moves into the pipe, the layer of fluid in contact with the surface of the pipe come to a complete stop. This layer also causes the fluid

particles in the adjacent layers to gradually slow down as a result of friction between fluid molecules, leaving the fluid at the center of the pipe with the maximum velocity.

Since the fluid is incompressible, to make up for this velocity reduction, the velocity of the fluid at the mid-

section of the pipe has to increase to keep the mass flow rate through the

pipe constant. As a result, a velocity gradient develops along the pipe and the maximum velocity which is at the center of the pipe increases with distance from entrance.

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A gas enters a compressor that provides a pressure ratio (exit pressure to inlet pressure) equal to 8. If a gage indicates the g

olga55 [171]

Answer:

$P_2_{abs}=160\ psia$ (absolute).

Explanation:

Given that

Pressure ratio r

r=8

$r=\dfrac{P_2_{abs}}{P_1_{abs}}$

$8=\dfrac{P_2_{abs}}{P_1_{abs}}$ -----1

P₁(gauge) = 5.5 psig

We know that

Absolute pressure = Atmospheric pressure + Gauge pressure

Given that

Atmospheric pressure = 14.5 lbf/in²

P₁(abs) = 14.5 + 5.5 psia

P₁(abs) =20 psia

Now by putting the values in the above equation 1

$8=\dfrac{P_2_{abs}}{20}$

$P_2_{abs}=8\times 20\ psia$

$P_2_{abs}=160\ psia$

Therefore the exit gas pressure will be 160 psia (absolute).

7 0

3 years ago

What is the best reason a scientist might use a model to represent the solar system?

uranmaximum [27]

So they can grasp a better understanding! good luck

3 0

3 years ago

Software, such as a word processor, search engine, or mobile interface, typically includes plug-in support specific to a languag

bearhunter [10]

Answer:

Check the explanation

Explanation:

class LanguageHelper:

language=set()

#Constructor

def __init__(self, words):

for w in words:

self.language.add(w)

def __contains__(self,query):

return query in self.language

def getSuggestionns(self,query):

matches = []

for string in self.language:

if string.lower().startswith(query) or query.lower().startswith(string) or query.lower() in string.lower():

matches.append(string)

return matches

lh = LanguageHelper(["how","Hi","What","Hisa"])

print('how' in lh)

print(lh.getSuggestionns('hi'))

===========================================

OUTPUT:-

==================

True

['Hisa', 'Hi']

====

7 0

3 years ago

When one of the data sources used for incident decision making is coming from individual or aggregated log files, the management

Studentka2010 [4]

Answer:

Explanation:

3 0

3 years ago

A thin flat plate of surface area, 500 cm², is located between two fixed plates such that the gap below the top plate is 20 mm a

kodGreya [7K]

Answer:0.3166N

Explanation:

Given data

Area $\left ( A\right )=500 cm^2$

Gap below top plate $\left ( y_1\right )=20 mm$

Gap above bottom plate $\left ( y_2\right )=30 mm$

SAE 30 oil viscosity = $0.38 N-s/m^2$

Velocity of middle plate $\left ( v\right )=1 m/s$

There will viscous force on middle plate i.e. at above surface and below surface

Viscous force $\left ( F\right )=\mu \frac{Av}{y}$

$Net Force on plate F =\mu Av\left [\frac{1}{y_1} +\frac{1}{y_2}\right ]$

$F=0.38\times 500\times 10^{-4}\left [\frac{1}{20\times 10^{-3}} +\frac{1}{30\times 10^{-3}}\right ]$

$F=31.66\times 10^{-2}=0.3166 N$

this is force by oil on plate thus we need to apply atleast 0.3166N to move plate

8 0

3 years ago