Draft tube and its efficiency

To take out petrol from tank of bike we use a rubber pipe. One end of pipe is dip inside the tank and petrol is sucked from other open end. Once the petrol starts coming then it steadily flows out provided that the level of open end of pipe is below the level of tank. This is called as action of syphon.
Similarly when the water comes out from the hydraulic turbine (Francis and Kaplan or other reaction turbine) then if we apply a pipe on the exit of turbine for developing action of syphon then it will start pulling water from turbine to develop extra hydraulic power ( together with push force of water when it enters the turbine). That pipe is called as draft tube. Learn the concept of Draft tube by this easy to understand lecture....

[@bittudangi6742]

One of the best explanation on draft tube...

[@kriteshdiwakar8241]

Bhaisahab kya samjhate hain aap maja ajata hai dekh kar aur aapke us Knocking wale lecture ki wajah se mera Internal combustion engine and gas turbine subject clear ho gaya.Thanks i hope ki is baar fluid machine bhi ho jaye.thanks again sir

[@DeKubaMadre]

Better than my Uni Prof, great job !

[@ranjitpanigrahi5096]

Excellent video I have seen related to draft tube so far 🔥🔥🔥

[@farahnazghanbari9957]

you are one of the best teachers that I have seen in my life

[@satyajitroychoudhary1826]

Very knowledgeable information sir.

[@azadkrishna12]

awesome None have ever explained in such a way..👍

[@pratik2583]

Excellent.loved it

[@sachinramesh1540]

Way of teaching is very appreciable.thanks🙏🙏

[@pankajkumar-do6rs]

Now i know the importance of draft tube... Thank you so much for this nice content.

[@anishsharma7331]

nice one sir....very easily u made it to understand...thanxx alot!!

[@akshaykumar-sb5iq]

very well explained sir

[@MRDigitalEducation]

Thank you ..Came to know importance of draft tube from your video onlu

[@mohammedrafath3370]

Wonderful lecture

[@mvthought_]

Thank you so much sir now this time i've got satisfied answer

[@ashutoshsaini2978]

Really helpful thanks a lot

[@dhruv3560]

best explanation

[@sanipatel5974]

one of the best explanation..👌👍

[@AmpedUpWithKrishna]

nice explain

[@aravind43]

Thanks for the video

[@VikashKumar-vl4hv]

Thank you very much sir, the video cleared my concept about draft tube

[@AnimeWorld-xe2mm]

as usual it is also the best explained

[@subhanimohammed8384]

amazing explanation...extremely helpful..thnx a lot sir

[@aman.easpur]

Diverging angle is generally taken 5 to 7 degree to avoid Flow separation.

[@this_too_shaII_pass]

This is an extremely good video, thank you so much!

[@crackmech5931]

Thank u sooo much sir...u always make my doubt crystal clear...

[@vishalshakya4141]

Quality video.. Thank you

[@RIYAZHUSAIN]

wahoooooo... clearly explained.. thank you sir

[@AG-id5fj]

Very nice explanation sir thank you

[@rajrajput9749]

Wow amazing....

[@ASHOKKUMAR-jn2xb]

Excellent explanation bro

[@RajanKumar-xi8ds]

Very nicely explain.

[@shreyasbangera2140]

Thanks, that's a very clear explanation

[@ekvinaysayaraj6071]

Thank you that you made me understanding the draft tube importance. This make me wanting to know more how to design/calculate the draft tube. Is it any limit to determine the H of draft tube, its longest length compared to whatever number such as diameter of A1 or A2 or compared to V1 or V2 or compared to P1 or P2...? or any recommend of of wide angle of the draft tube wall?

[@Dr.AmitMandal]

must avoid flow seperation while passing through....

[@alokkumarnyati]

What a Dam good lecture

[@mathsanalysis8402]

Thanks a lot sir because I have understood draft tube

[@harshavardan8748]

Excellent video thanks

[@Veenapappuri]

Sir excellent video

[@anveshsameer]

You said it is copyright protected, am I not permitted to take a picture of the draft tube from the video?

[@prem7556]

Thank you sir, cleared many doubts

[@cosmos1701]

Nice Explanation

[@akhiborntorock1]

As there is vacuum at point 1...the water can flow back from tail race to the point 1?? Possible right ?? If not why

[@JNL02023]

Akhil C Flow gets reversed if and only if , large work done against gravity ! It would require head (Gross head + H) & its not possible..😊

[@polashthoughts2052]

Its a helping one .Thanks.

[@mrizalrizkihansyah8782]

Sir, i hace a question. When the outlet draft tube on top surface of tail race and outle draft tube on surface of tail race. What is the difference between two case?

[@lalitsharma5114]

Sir aapka content to bahut acha hai But samajh nhi ata ki subscriber itne kam kyu hai

[@ravindarsingh3002]

nice work

[@pratikbose4399]

I request you to upload a video on degree of reaction....

[@lalankumar-qk2rf]

best

[@Hopeforgoodd]

sir why shoud we use drft tube only for rectin turbine....

[@Dr.AmitMandal]

Akhil , at point 1 pressure is higher compared to 2 , otherwise fluid can't flow toward draft tube...

[@akshaymanikjade]

Amit Mandal Sir but area of draft tube is diverging so velocity is low and pressure is high then how come its possible.... pls demolish doubt...

[@chirucvt]

Excellent super

[@gauthamsathyaprabhua464]

sir...what is the use of decelerating the liquid coming out of impeller using draft tube?

[@mrizalrizkihansyah8782]

Sir, i have a question. When the outle of draft tube (sectioan 2) is above from water of tail race. How do we calculate the pressure on section 2? Please help me sir, thank you.

[@farhanalix]

Thank you !

[@thanithaweerasekera5240]

To the point, crystal clear. Thank you.

[@abhishekbhandari3583]

Thx sir it really helpfull

[@ishangupta1375]

Why negative pressure created ?

[@alokdesai5326]

really helpful

[@thresholdfrequency9725]

Thanks a lot ...sir ..

[@modassirahmed5712]

Why uou put p2=p0, we use hydrostatic only in static condition..

[@mohitbache8411]

-ve pressure hoga to suction crate hoga how is this possible

[@ShubhamMishra-ij8vg]

technically helpful for hydraulics....!

[@saiganeshpinnam6317]

Thank you sir😃😄

[@lokeshn.jeengar8015]

Thanku so much sir

[@Khizar_Ansari]

What if we make it converging?

[@Dr.AmitMandal]

it will Reduce its efficiency

[@maninderbisht9681]

thanks sir

[@ravikiran3314]

its good... but make it short

[@civilzone5117]

good good

[@keshavsharma4818]

Thanks..

[@mayankbhadauriya]

Awesome Explanation

[@miltondeon1031]

in efficiency why H is not added

[@prithvirajgohil4163]

sir can you please make make video on "what will happen if we don't use draft tube"?

[@Dr.AmitMandal]

+Prithviraj Gohil low power developed.

[@prithvirajgohil4163]

Amit Mandal sir , so water will be discharged or not because it will be at low pressure as compared to atmospheric temperature.

[@Dr.AmitMandal]

+Prithviraj Gohil ya it will

[@MANISHKUMAR-fv1em]

Thank u. Sir could u explain why pressure at point 2 is taken as atmospheric pressure?? If we apply Bernoulli's equation between water point 2 and outside water from draft tube it will give " Pa=P2+$V2^2/2 (take density by symbol $) " so sir P2 is less than Pa. Sir could u pls correct me.

[@Dr.AmitMandal]

P2 is less than Pa but greater than P1 . It appears you are confused with static pressure, dynamic pressure and total pressure.

[@prashantparaye3696]

plss upload on drafttube discharge angel

[@EchoEdits786]

how pressure becomes negative? (P2)

[@Dr.AmitMandal]

+vipuces its due to 'pull' of water content in downward direction...

[@rahulbhati4749]

sir governing of propelr turbine bta do plss

[@rahulbhati4749]

sir plss propeler turbine ki govrning bta do

[@sukanyasengupta8388]

excellent

[@shettipellikomal6421]

So does a draft tube increase the chance of cavitation ?

[@Dr.AmitMandal]

If not designed properly

[@rahulbhati4749]

funtion bhi bta do sir drft tube ka

[@Dr.AmitMandal]

+rahul bhati to reduce head loss

[@shekarganthi2039]

nice