During the experiment of shell and tube heat exchanger by using this equipment the Source of the water was from the water tap that is mean it is open feed water
To explain more: the lab engineer used a drink water that supply it from the water tap directly to the heat exchanger equipment
And then he discharge the water to the sink that is not correct way ? I do not have a scientific answer in this but what i think the water from tap is not laminer and the temperature
is not fixed . so I need a real explanation in mechanical and chemical engineering about this
CAN you explain why the way of supplying water like this to the equipment is not good ?
and what the engineer used ?
which type of liquid shall he used ? And why and how it will improve
think about salt in the normal water as well as the bacteria, Think about fouling factor , cleaning heat exchanger regularly,
In: Mechanical Engineering
How does solid solution hardening relate to a phase diagram?
In: Mechanical Engineering
I have a 50cc of hydraulic motor, accumulator pressure at 40MPa at max, with 10MPa at precharge. How can i determine what pump sizing will i use for hydraulic hybrid purpose.
In: Mechanical Engineering
Describe grain size refinement, solid solution strengthening, precipiation hardening, and work hardening. Why and when do you use each of these strengthening processes?
In: Mechanical Engineering
Convection heat transfer takes place owing to changes of density within the Fluid.
Discusss convective heat transfer in some detail. Your answer should include relavant sketches, equations and practical applications
In: Mechanical Engineering
1. What are the age hardening alloy systems in Al-based alloys based on classification of major alloyingsystems for Al-based alloys?
2.In alloy system of Al - 4.4%Cu - 0.8%Si - 0.8%Mn - 0.5%Mg which is commonly used for aircraft structures, sketch and explain all transformation stages during age hardening. What is the driving mechanism for each step?
In: Mechanical Engineering
Forced convection
A thin plate is suspended in air at 1 atm. with T? = 15°C. Air
flows on both sides of the plate where the bottom side absorbs a
uniform radiative heat flux of 1542 W/m2. The plate is oriented
parallel to the flow and the length along the flow direction is 60
cm. Consider the plate is negligibly thin and the width of the
plate (perpendicular to the flow) is large, so that the problem can
be considered as a 2D problem.
1. If the temperature of the plate is not to exceed 80°C at any
position, what air velocity would be required? Evaluate the air
properties at 310 K. (3 pts)
2. Using the velocity calculated in part 1, find an expression for
the heat transfer coefficient (h) and surface temperature (Ts) as a
function of distance from the leading edge (x). Graph h and Ts for
x = 1 ~ 60 cm.
3. If the length of the plate increases to 1.2 m and other
conditions (including the air properties) remain the same as in
parts 1 and 2, what is the surface temperature at the end of the
plate? Graph h and Ts for x = 0.6 ~ 1.2 m
In: Mechanical Engineering
Why do we need methods in addition to tensile testing?
In: Mechanical Engineering
1. Describe how bauxite is converted to aluminium oxide (Al2O3) via the Bayer process?
2. Describe the Kroll process used to produce metallic titanium. Give the key chemical equation.
3. Give 2 short application examples of the Ellingham diagram in process metallurgy.
4. Name 2 important fields of application of Ti alloys and an alternative processing route that can provide highest purity Ti.
5. What is the main Al ore and where are the world’s largest reserves? Given the fact that these high alumina containing ore bodies might be depleted in 20-30 years, what could be an alternative source?
6. Describe the electro-refining process of copper and give the most important chemical equations.
In: Mechanical Engineering
6. A motor car, of a total mass 1400 kg, running in
top gear at 55 km/h, passes on to a rsing gradient of 1 in 20 at
that speed. The road and other resistances may be taken as constant
at 270 N/t. With condition unchanged, the speed falls uniformly to
40 km/h in a distance of 360 m. An intermediate gear is then
engaged for which the speed ratio between the engine and the road
wheels is 9:1 and the transmission efficiency is 85 per cent. The
engine is then developing a torque of 85 Nm
Determine;
a. The tractive effort before and after the gear change, given that
the road wheels are 750 mm diameter, [851 N; 1735 kN]
b. The time between the start of retardation and the recovery of
the original speed of 55 km/h and [36 s]
c. The power being developed by the engine when the car is
retarding and accelerating through 50 km/h, given that the
transmission efficiency in top gear is 94 per
cent. [12.56 kW;
28.35 kW]
In: Mechanical Engineering
4. A wagon of mass 14 tonnes is hauled up an incline
of 1 in 20 by a rope which is parallel to the incline and is being
wound round a drum of 1 m diameter. The drum, in turn, is driven
through a 40 to 1 reduction gear by an electric motor. The
frictional resistance to the movement of the wagon is 1.2 kN, and
the efficiency of the gear drive is 85 per cent. The bearing
friction at the drum and motor shafts may be neglected. The
rotating parts of the drum have a mass of 1.25 tonnes with a radius
of gyration of 450 mm and the rotating parts on the armature shaft
have a mass of 110 kg with a radius of gyration of 125 mm.
At a certain instant the wagon is moving up the slope with a
velocity of 1.8 m/s and an acceleration of 0.1 m/s2. Find the
torque on the motor shaft and the power being developed. [T= 154
Nm, P=22,24 kW]
In: Mechanical Engineering
A piston with a volume of 0.5 m ^ 3 contains 0.9 kg of water at a pressure of 0.2 MPa. Heat is transferred to the cylinder until the temperature of the steam at constant pressure is 250 ° C. What happens if the change in kinetic and potential energy is neglected?
A piston with a volume of 0.5 m ^ 3 contains 0.9 kg of water at a pressure of 0.2 MPa. Heat is transferred to the cylinder until the temperature of the steam at constant pressure is 250 ° C. What happens if the change in kinetic and potential energy is neglected?
In: Mechanical Engineering
2. A four-wheeled vehicle has a mass of 1500 kg. the
tractive resistance is 1100 N. The engine develops 60 kW at maximum
speed of 2500 r/min. The gear ratio is 45:1 and the transmission
efficiency is 87.5%. Each wheel has an effective diameter of 800
mm, a mass of 25 kg and a radius of gyration of 325 m
The parts rotating engine speed have a mass of 70 kg and a radius
of gyration of 100 mm.
Determine:
a. The acceleration in m/s2 under these condition [0.7034
m/s2]
b. The maximum speed of the vehicle, in km/h [83,78 km/h]
In: Mechanical Engineering
(a) Calculate the settling velocity of glass spheres (density = 2467 kg/m3) having diameter as 1.5 mm in water. The slurry contains 65% by weight solid. Use Newton’s law.
(b) Mixture of an ore (density 2000 kg/m3) and gangue
(density 7000 kg/m3) is to be separated in a hydraulic elutriator.
The mixture has following size distribution, which is valid for ore
as well as gangue. Predict the upward velocity of water in
elutriator so that entire ore is collected in the overflow. Also
ensure that not gangue should be present in overflow. Use fD =
20/Re^0.5 .
In: Mechanical Engineering
A 6 in. schedule 800 steel pipe (OD =6.62 in) will be used to transport 450 F steam from a boiler house to a new process unit. the pipe will be buried at a depth of 3 ft (to be pipe centerline). the soil at the plant site has an average thermal conductivity of 0.4 btu/h.ft F and the minimum expected ground surface temperature is 20 F. Estimate the rate of heat loss per loot of pipe length for the following cases: a. the pipe is not insulated b. the pipe is covered with a 2 in. thick layer of magnesia insulation
In: Mechanical Engineering