Most important topics in Mechanical Engineering
mechkyI'd suggest you to develop a very strong understanding of basic subjects like - mechanics, thermodynamics and manufacturing processes.
Later on, when you will start developing interest in some specific field, then you can master in subjects pertaining to that particular field.
zaveriConcentrate on mechanics and thermodynamics. these are the pillars of this branch.
the others are design concepts, manufacturing technology and materials science.
in higher semesters give importance to machine dynamics, and finite element analysis.
jishnu nairheyyyy thanxxx a lot dude 😀😀😀
Ankita KatdareSo, since this is something that a lot of people are searching for and coming to CrazyEngineers, I think we all should do our bit in making this discussion more useful and important.
Here is a list of the basic terms that every mechanical engineer should know. Anyone here wants to take a lead in explaining some of them?
You could just give out one liner simple definitions so that other beginners can benefit from this one-stop content.
1. Torque or Turning Force
7. Specific Weight
8. Specific Volume
9. Specific Gravity
10. Specific Heat
13. Discharge of Fluid
14. Bernoulli's Equation
15. Device for Fluid
16. Mach Number
17. Hydraulic Machine
18. Draft Tube
19. Thermodynamics Law-
21. calorific value of fuel
22. Boiler/Steam Generator
24. Air Preheater
25. Boiler Draught
32. Rating of fuel-
33. Stoichiometric Mixture/ Stoichiometric Ratio
34. Heat Transfer
35. Thermal Conductivity
36. Heat Exchanger
38. 1 tonne Refrigeration
41. Gear Train
42. Gyroscopic Couple
43. Heat Treatment
45. Non-ferrous metal
52. Nuclear Fission
53. Nuclear Fussion
55. Machine Tool
56. Cutting Tool
zaveriThe list is too big. I will explain a few of them, at random, rest of them will be taken care by other mechies:
1.) Torque: It is a rotating force, which tends to rotate a body about an axis. it is expressed as the force multiplied by the distance between the force and the turning point.
3) Strain: the ratio of the deformation caused in the body, when the load is applied, to the original dimension.
19) second law of thermodynamics: The efficiency of no machine is cent percent.
55) machine tool: machines used for manufacturing components, by means of material removal process example : lathe, milling, shaper,etc.
56) cutting tool: the tools used in the machine tools . example: drill bits, milling cutter etc.
44) ferrous metal: alloys of iron and steel
45) non ferrous metal: example: aluminum, copper etc.
58) jig: a stencil or pattern like device, used for speeding up the process while cutting holes, or other features, on a large number of jobs (amounting to around 1 lakh pieces)
30) governor: a mechanical speed controlling device, operating on the principle of centrifugal force.
zaveri27) scavenging : the process of removal of the residual exhaust gas in an I.C engine cylinder, by mixing it with some fresh intake air.
28) supercharging: the process of increasing the volumetric efficiency of an I.C engine, by compressing the intake air. the compressor used here is crankshaft driven.
29) Turbocharging: same as supercharging. here the compressor is driven by a gas turbine, which in turn is powered by the exhaust gas from the engine.
spiceluvver23. Superheater - it's function is to heat the steam and to make it as dry as possible
Ankita KatdareThat's great #-Link-Snipped-# and #-Link-Snipped-# Please let us complete the list folks. 😀
The second law of thermodynamics gives a precise definition of a property called entropy. Entropy can be thought of as a measure of how close a system is to equilibrium; it can also be thought of as a measure of the disorder in the system. The law states that the entropy—that is, the disorder—of an isolated system can never decrease. Thus, when an isolated system achieves a configuration of maximum entropy, it can no longer undergo change: It has reached equilibrium. Nature, then, seems to “prefer” disorder or chaos. It can be shown that the second law stipulates that, in the absence of work, heat cannot be transferred from a region at a lower temperature to one at a higher temperature.
spiceluvver36. Heat Exchanger
Heat exchange is a natural phenomenon occurring throughout our environment. It drives the weather cycles and energy exchange between ecosystems. Harnessing its utility through accurate control of heat exchange has been a focus of our industry for over a century.
Heat exchangers allow control over the dynamics of heat transfer between fluids. They are used in widespread applications, such as solar heating, pool heating, domestic water heating, radiant floor heating, food processing, marine applications, general industrial process control, and more
Below are parametric thermodynamic equations that define the nature of heat exchange and performance of a heat exchanger for any given application. Once these thermal parameters are determined they can be used to calculate heat exchanger performance in order to select the most suitable product based on the specific application.
Theoretical Heat of a Fluid
The heat transfer principal in heat exchangers is based on a colder fluid gaining heat from a relatively hotter fluid separated by, and flowing over, a heat conductive material.
This is expressed by the following formula:
Q = Total heat load
m = Mass flow rate of fluid.
cp = Specific heat of fluid at constant pressure.
DT = Change in temperature of the fluid.
This formula provides the Theoretical Heat Yield to or from a given fluid undergoing a temperature change, DT at a mass flow rate, m with the fluid’s specific heat property, cp.
Practical Heat Transfer Control
The theoretical heat yield of a fluid gives the amount of heat that needs to be transferred into or from a fluid. The practical heat transfer is a function of the physical geometry of the heat exchanger, its material composition, and the fluid condition.
The general form of the equation defining the maximum potential heat transfer through a heat exchanger is expressed by the formula:
U = Overall heat transfer coefficient
A = Surface area
LMTD = Logarithmic mean temperature difference
The Practical Heat Transfer Control is determined by the molecular thermodynamic interactions between the fluids flowing through the heat exchanger and the geometry of the heat exchanger itself.
The overall U value is calculated by an equation specific to the geometric configuration of a Heat Exchanger. It is a function derived using dimensionless numbers such as Reynolds Number (Re), Prandlt Number (Pr), along with fluid flow parameters. The overall U value is calculated over the total surface area A of the heat exchanger, across which the fluids exchange heat.
The log mean difference of the inlet and outlet temperatures (LMTD) of the hot and cold fluids for a counter flow exchanger is expressed by the formula:
Thi = Inlet temperature of hot fluid
Tco = Outlet temperature of cold fluid
Tho = Outlet temperature of hot fluid
Tci = Inlet temperature of cold fluid
Practical heat exchange value, Qp, can be compared to the theoretical, Qt, value to determine if the heat Exchanger has enough capacity to fulfill the application requirements.
A governor, or speed limiter, is a Machine used to measure and regulate the Speed - Wikipedia of a Machine, such as an Engine. A classic example is the Centrifugal Governor, also known as the James Watt or fly-ball governor, which uses weights mounted on spring-loaded arms to determine how fast a shaft is spinning, and then uses Proportional Control to regulate the shaft speed.
some more info
spiceluvver22. Boiler/Steam Generat
Hemraj BijarniyaFocus on thermodynamic & machine tools rules of motion 😀
I am Ajith, I have doubt in shell tube heat exchanger that is if we introduce a fin on the walls of tube can the heat transfer rate be increased
Mechanical important topic
#-Link-Snipped-# Did you go through all the topics shared above in the discussion? Are you looking for something specific?
Such important topics for mechanical engineering can be useful for cracking an interview or viva for students.
Here goes my list -
- Carnot Cycle, Otto Cycle, and Diesel Cycle
- MPFI and TPFC systems
- Laws of Thermodynamics
- 4-stroke and 2-stroke engine mechanisms.
- SI and CI engines
- Turbo charging Vs. Supercharging
- Jet Propulsion, Ramjet, Scramjet, Turbojet, Turboprop, and Turbo fan
- Refrigerator system
- Heat Exchangers
- Stephan-Boltzmann Laws, Kirchoff's Law, Planck's Law and Wien's Displacement Law.
- CDI, ball pistons, camless engines like GDI, VTEC
- ABS, ESP, SBC, SOHC, and DOHC explanations
- CNC and DNC machines
- Cooling fluids and their functions
- Heat treatment processes
- Hook's law
- Euler's theory
- Bernoulli's theorem
- Six Sigma
- Basics of thermodynamics
After I started writing this list, I think I realised that the topics are way too many to list. Good job by @zaveri in listing above definitions.
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