Momentum Thickness

[@TutorialsPoint_]

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[@chandramoulisanthanam6964]

The derivation shown here is what is given in most Indian textbooks and it is not correct!. It just leads to the same result. At 2:10, if the boundary is not considered why is the mass flow still (rho* 'u' *b*dy)? shouldn't it be (rho* 'U' *b*dy)?. The problem is that the ideas of boundary layer thickness, displacement thickness and momentum thickness are presented separately as if they are not connected but actually, they are very much related! For a correct explanation of these topics, please see the NPTEL video lecture on boundary layers kzbin.info/www/bejne/g6rOapqObZJ2m6s ( from 29:40)

[@hemenkalita6582]

thanx, the video u referred is great.

[@DaniShmait]

Thank you!! Oh and to reach momentum thickness directly it's 39:00

[@Azzu974]

Same doubt i raise it bro

[@prathameshdand4418]

Yes u r right, same doubt here.

[@pratik2886]

Thnx 👍👍 well done

[@1023179152]

At 2:08, why is the momentum flux p*u*b*dy*U , instead of p*U*b*dy*U. Don't we know that the velocity is U for uniform flow? Not u?

[@anishdstar]

time: 2 min...how come the mass of no boundary layer has 'u' as velocity and not 'U'?

[@giadaluppino2317]

mass flow rate in boundary layer is the same as in the case with no boundary layer. is the evolution of the same flow that encounters a surface like a flat plate...

[@shriharir6450]

@@giadaluppino2317 how come its the same !? Its clear the the section with boundary layer is of velocity u nd without its U. So how can the massflow rate alone differ!?

[@battlewing221]

same doubt bro any answer you got?

[@shriharir6450]

@@battlewing221 its actually wrong here... Nd its also wrong in many textbooks!!! Go to nptel videos and watch them... They teach the correct method.

[@battlewing221]

@@shriharir6450 nice

[@rifat6049]

thanks.... long live India

[@adarshthallapelly1942]

While calculating momentum loss per second without considering boundary layer I thing it would be (rho*U^2*b*dy) bcz velocity is constant i, e U with no B.L condition

[@rohannalawade3227]

How is the mass for boundary less same as that of the case with the boundary. Shouldn't it be p×U×dy×b. ?

[@giadaluppino2317]

is the same for continuity equation... mass conservation!

[@029mdsaif9]

@@giadaluppino2317 i did not think so, tell me in displacmenet thickness why their is no continutity equation?

[@배병준-r2m]

Thank you sir

[@Watersolutionhub]

Sir thank you very easy explanation

[@muhammadusmanarif5338]

Thanks.

[@rumamahato5859]

If momentum thickness increases then velocity increase or decrease?

[@santoshanand8237]

Increases

[@98adityasingh]

Brief and perfect!

[@shivasmart967]

tq sir

[@shuklaacademy1138]

Thanks sir for the doubt clearing video

[@vinodmalve7320]

Perfect