Otto Cycle of Internal Combustion Engines, Gamma vs Compression Ratio, Adiabatic Processes - Physics

This physics video tutorial provides a basic introduction into the otto cycle of an internal combustion engine. The first step is an adiabatic process when the gas undergoes compression. As the volume decreases, the temperature of the gas increases and the pressure greatly increases favoring ignition. The second step is an isochoric process which causes a further increase in pressure. Heat is added in this step but no work is done. The third step is an adiabatic expansion - no heat is transferred but the gas performs work on the surroundings as it expands. The final step is an isochoric process where the pressure decreases. This video also contains a few practice problems on calculating the compression ratio, the gamma ratio, and the efficiency of the internal combustion engine as well as the molar heat capacity of the working substance at constant volume and at constant pressure. This thermodynamics video tutorial contains plenty of examples and practice problems.
Open Vs Closed Vs Isolated System:
• Open System, Closed Sy...
First Law of Thermodynamics:
• First Law of Thermodyn...
Isobaric Process:
• Isobaric Process Therm...
Isochoric Process:
• Isochoric Process Ther...
Isothermal Process:
• Isothermal process The...
Internal Energy of an Ideal Gas:
• Internal Energy of an ...
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Adiabatic Process:
• Adiabatic Process - Wo...
PV Diagrams:
• PV Diagrams, How To Ca...
Thermodynamics Review:
• Thermodynamics, PV Dia...
2nd Law of Thermodynamics:
• Second Law of Thermody...
Heat Engines:
• Heat Engines, Thermal ...
Converting Heat Into Electricity:
• Thermodynamics - Conve...
________________________
Carnot Cycle:
• Carnot Cycle & Heat En...
Refrigerators and Heat Pumps:
• Refrigerators, Heat Pu...
Entropy:
• Entropy Change For Mel...
Heat Engines and Refrigerators Review:
• Carnot Heat Engines, E...
Physics PDF Worksheets:
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[@oladelerasheed4994]

All rounder...this man should be given an award.....a genius per excellence

[@jojos3685]

I’m boutta give a reach around pal

[@seraphin9585]

we need more internal combustion engine problems, there's too little results to see when searching for them. thank you for your hard work :>

[@PrinceAnkrah]

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You teach almost everything. ❤❤

[@enderslayer2111]

The greatest teacher ever walk on the planet yes

[@vasseroghaniy]

this is lit

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[@naina4288]

this man is a legend

[@solomonglenda6811]

Why is there no video on Diesel Cycles? 😭😭

[@math1862]

thank you, you're a legend

[@albertopopescu7848]

absolute sort-out, ur a god

[@vaishnavipal2298]

Cv is molar heat capacity at constant volume, during A to B the process is compression, volume does change, but you said that work done is always n*Cv*delta(T) (that's true) but aren't these 2 things contradictory to each other?

[@sharvapotdar3257]

How are they contradictory?

[@Acoustic_Mutale]

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I thouht I'd never meet you again after first year, now we meet at Fluid Mechanics and Thermodynamics ENG 3165 😅
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[@efrainsanchez8064]

Good vid.
Thanks dude.

[@saltydogg]

So, the efficiency of gasoline is directly proportional to the percentage of hydrogen and inversely proportional to the percentage of carbon.The mass of hydrogen is 13%, the mass of carbon is 87%. If the percentage of hydrogen is increased the percentage of energy is increased but the percentage of carbon is decreased. This means that the inefficiency of gasoline (the carbon) can be removed. If a vehicle goes 100 miles and burns 2.5 gallons (7.144 kg) of gasoline 7144 ÷ 100 = 71.44 grams of gasoline per mile but if the hydrogen is doing all the work then 77.44 - 87% = 9.287 grams per mile. Does anybody really think we can get to 0.00 grams per mile.

[@jtb6075]

The processes that you mentioned at 9:02 are not isochoric, the volume changes during that process.

[@lucasdemontigny]

No, not in the Otto cycle. It does change in the Carnot cycle however.

[@musarapio_hha]

i have a question following the otto cycle you can reemplace the "terms", and calculate lets say the point at PC
using the same formula???
min 22:09 of the video
pc= pb (tc/tb) * r

[@amirachennouf2684]

Is this the same as the one called 'Beau de Rochas cycle' ?

[@squeecy9965]

How might throttle and mixture(fuel/air ratio) play into all of this?

[@engr.facemaskman8093]

Sa fuel na Po yon, sa air and fuel ratio na Po yon may ibang computation Po Jan sir.

[@ZaydEdits]

for delta u = n*CV*deltaT, what is n? Is it the number of moles in the specific mass of the substance?

[@ishaanbaruah8968]

number of moles

[@jaswanthreddy3133]

I am having exam on thermodynamics ...so plz help me sir

[@r410a8]

If the theoritical efficiency of an internal combustion engine with so low pressure ratio is so high (over 50% for under 9) why cars' enginees are so inefficient and need so big amounts of fuel in order to produce mechanichal work?
Why engine producers strugle with more high pressure ratio and more low lamda ratio in order to make them more efficient?
I think about mabe if the real gamma ratio is in reality lower than 1,4 so that's why the efficiency is pretty low,and with a research and study on the theme i thing that brcause of the flown composistion for lamba =1 the real gamna is around 1.15 ,i calculated so.

[@arkgamer742]

Its because it does not account for heat transfer to engine components like the cylinder wall and piston and friction

[@naeem6583]

Holy fu** you're teaching Internal Combustion Engine now?!!

[@Keroro2593]

Is Qh=Qc?

[@runar3033]

no

[@JosephStalin-yk2hd]

It’s Qh/Qc

[@aubreystrawberry214]

doesn't the P(b)/P(a) = r^gamma?

[@jaswanthreddy3133]

Sir I want solution for this sum ""an otto cycle takes in air at 300k the ratio of maximum to minimum temperature is 6 .find out the optimum compression ratio for maximum output of the cycle."""

[@jaswanthreddy3133]

Plz let me know fastlly sir