- A round composite bar is used to conduct heat. It is held at
600K at one end and 1000K at the other end but all other surfaces
are insulated. The two end pieces of the bar are Stainless Steel
(AISI304), and the middle piece is Copper. The length of each piece
of the bar is 0.2m (total length is 0.6m) and the diameter is
0.07m. Generate an x-y plot of the temperature distribution along
the
**center axis**of the bar (plot T vs x). Select your own values for T_{1}and T_{2.}Assume zero contact resistance between the sections. - Solve this problem by hand and provide a plot of the temperature distribution for the composite bar. Include your hand calculations in your deliverable. You can use equation editor or include a photo of your paper if your handwriting is tidy and the picture is properly cropped

In: Mechanical Engineering

Solid desiccant air dehumidifier systems are widely used to
supply dry air for many industrial processes. As humid atmospheric
air flows through the system, the water vapor in the air is
adsorbed by the desiccant material, resulting in dry air leaving
the system. Inlet air velocity and tekperature are observed as
predominant parameters that influence the outlet conditions of the
air. Consider a cylindrical air channel with a length of 1 meter
and an inner diameter of 20 mm, as a representative of a
dehumidifier system. The wall of the channel is made of silica
powder material with a thickness of 0.2 mm. Air enters the channel
at T_{i} = 30°C and 10 m/s. Heated air is forced to flow
over the entire channel so that it could provide a constant inner
surface temperature, T_{s,i} of 60°C. Determine,

i. the exit air temperature of the channel, T_{e,}
^{o}C

ii. the rate of heat transfer, and

iii. the outer surface temperature of the channel,
T_{s,o,} ^{o}C.

Evaluate the air properties at a bulk mean temperature of 40°C

In: Mechanical Engineering

B- For design of a car suspension system, what type of vibrational system you would choose (over damped, under damped, critical damped) and why (bring 2 reasons for your selection)?

C- For design of an office door stopper system, what type of vibrational system you would choose (over damped, under damped, critical damped) and why (bring 2 reasons for your selection)?

In: Mechanical Engineering

Crude oil of specific gravity (0.75) is flowing through a pipe.
The pipe has a diameter of 100 mm and 50 mm at the sections 1 and 2
respectively. The velocity of crude oil at the section 1 is 550
cm/s. The section 1 is 3000 mm and section 2 is 2000 mm
above the datum. If the pressure at the section 1 is 0.2
N/mm^{2}, find the intensity of pressure at section 2?

In: Mechanical Engineering

What techniques can be used to predict the failure of
machine/equipment for

the purpose of preventive maintenance.

In: Mechanical Engineering

Performance evaluation of cold tube heat exchanger for various L/D ratio and mass flow rate. using Ansys show the temperature distribution. and make a mathematical model in scilab and perform simulation in fortran 77...

In: Mechanical Engineering

A single start square- thread power screw has a diameter of 2 inches and a pitch of .4 inches.

Calculate the:

- Lead
- Mean pitch diameter
- Lead angle (λ)
- Normal angle (αn

In: Mechanical Engineering

Task 1

Company 1 is new into distillation & separation has approached
CD19 for support on the following problem: -

**(a)** They wish to separate a 50-gram sample of a
new liquid compound, by heating it in a reactor to convert it from
liquid to gas. The final pressure of the gas should be 775 mmHg at
24oC. They are struggling to find the volume of the reactor. Can
you help? What volume of the reactor will be required to achieve
the stated requirements?

**(b)** Another placement student suggests that by
chilling the gas by 15oK will reduce the size of the reactor. Is
the second engineer correct and by how much would the volume
change?

**(c)** The temperature and pressure effects on a
liquid can be described by the kinetic molecular theory. The
customer would like you to explain this in a short and concise
manner.

You are expected to draw a diagram (labeled) of the relationship
between temperature and pressure for a liquid that is heated to
form an ideal gas. Relative phase compositions should also be
labeled.

**Data**

MWSample = 550 g/mol

1 mmHg = 133.32 Pa

In: Mechanical Engineering

Write the Conservation of mass equation as it applies TO YOUR SYSTEM

• Write the Conservation of Energy equation as it applies TO YOUR SYSTEM

• List all the assumptions and idealizations for the process

Diesel cycle

Fuel being used is diesel

1 cylinder, four-stroke, water-cooled, air injection of
fuel

Output: 14.7 kW (20 hp)

Fuel consumption: 317 g/kWh (238 g/hp-hr)

Efficiency: 26.2%

Number of revolutions: 172 min^{-1}

Displacement volume: 19.6 L

Bore: 250 mm

Stroke: 400 mm

In: Mechanical Engineering

A gas turbine power plant operates on a Brayton cycles
has a pressure ratio of 7. Air enters the

compressor at 300 K. The energy in the form of heat is transferred
to the air in the amount of 950

kJ/kg. Using a variable specific heat for air and assuming the
compressor isentropic efficiency is

83 percent and turbine isentropic efficiency is 85 percent.
Determine the followings:

(i) The highest temperature in the cycle [5 marks]

(ii) The net work output, in kJ/kg [10 marks]

(iii) The back work ratio [5 marks]

(iv) The thermal efficiency. [5 marks]

(v) Show the cycle on T-s diagram [5 marks]

In: Mechanical Engineering

Use your mechanical engineering skill. Explain in 200 - 250 words why DOE is important for a Mechanical Engineer using an example. In this section, it is not expected you implement DOE in one full example. The idea in that you reflect DOE understanding in a Mechanical field. Feel free to use any source but the answer must be thorough.

Please type, make it easy to understand.

In: Mechanical Engineering

Ideal Reheat Steam Cycle (10)

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at PH MPa and TH °C and is condensed in the condenser at a pressure of PL kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w% percent, determine:

(a) the pressure at which the steam should be reheated and show how you got the quality,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

PH = 20 MPa, TH = 700 °C, PL = 10 kPa and w% = 12.9%.

In: Mechanical Engineering

Determine the adiabatic combustion temperature at constant pressure and at constant volume for two of the fuels of personal choice. Graphically show that this corresponds to the product temperature where the heat of reaction is zero.

In: Mechanical Engineering

At a point in a stressed body, the principal stresses
are 100 MN/m2

(tensile) and 60 MN/m2

(compressive). Determine the normal stress and

the shear stress on a plane inclined at 50degree

counter clockwise to the axis

of minor principal stress. Also, calculate the maximum shear stress
at the

point and draw the Mohr’s stress circle to verify the
answers.

If the yield strength and Poisson’s ratio of the material in the
above case

is 240 MPa and 0.3 respectively, check whether the failure will
occur or

not according to (a) Maximum principal strain theory and (b)
Maximum

shear strain energy per unit volume theory. If failure does not
occur,

calculate the Factor of Safety.

In: Mechanical Engineering

An air-standard dual cycle has a compression ratio of 14. At the
beginning of compression, *p*_{1} = 14.5
lbf/in.^{2}, *V*_{1} = 0.5 ft^{3},
and *T*_{1} = 50°F. The pressure doubles during the
constant-volume heat addition process.

For a maximum cycle temperature of 3500°R, determine:

(a) the heat addition to the cycle, in Btu.

(b) the net work of the cycle, in Btu.

(c) the percent thermal efficiency.

(d) the mean effective pressure, in lbf/in.^{2}

In: Mechanical Engineering