Force Exerted by a Flowing Fluid on a Pipe Bend

[@TutorialsPoint_]

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[@Toby_Gomez]

Thank you! Literally the example I was looking for.

[@jamomondi]

Sir you have saved my life and for that you earn my subscription.

[@edutechguruengineeringlear4280]

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[@tkatvibez9567]

The final equation for Fx is Fx= P1A1-P2A2cos(theta)-[pQ(V2cos(theta)-V1)] Similar with Fy, but no y component on any flow that is in the x direction (Point 1)

[@bleubluebleu]

Hello, for all those who are having confusion in the sign of forces, I'll try to clear off the confusion. Here we go, directly have Fx on the LHS and rest all components on the RHS, now you'll find it easy to crack the logic behind the equations. Similarly do for Fy, i.e. Fy on LHS and rest all terms on RHS. Do include '0' in the equations to eliminate ambiguity. All the best!

[@nithinnayak503]

Sir, can u please explain why P2A2 is acting in the opposite direction? It should act along the flow direction right?

[@junedkhan488]

Same doubt

[@edutechguruengineeringlear4280]

@@junedkhan488 kzbin.info/www/bejne/bJqtop1pmbunjrs

[@edutechguruengineeringlear4280]

@@devindersingh1603 kzbin.info/www/bejne/bJqtop1pmbunjrs

[@Rohit_C_Patil]

Because we are considering continum. And we are showing opposite sign because it is the reaction applied by the fluid(at section 2-2) on continum. It will not act along direction of flow.

[@NK-iy6if]

God bless you! Thank you so much for the simple and clear explanation!

[@thelegend-kv2le]

its awesome, watching this video for my phd thesis in uwm. thanks and salam

[@SoarHL]

For a pipe bend maintained a certain pressure with non-flowing fluid, is there any thrust?

[@edutechguruengineeringlear4280]

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[@SoarHL]

@@edutechguruengineeringlear4280 This video is for flowing water, how about non-flowing water. Many design guidelines from UK snd Europe of thrustblock thinks that there is thrust in a non flowing water pipe. But isn't thrust comes from change in momentum, how come a non flowing water has thrust?

[@kuldeepchoudhary825]

One question, what will be the force balance if bend is moving with constant acceleration in positive x direction. What changes shall be in the force balance equation

[@karanamnaveen1799]

Why p2 a2 opposite direction sir

[@kalyanhp9742]

i will tell you why (p2 a2) taken as negative....you know what "stress is force acting per unit area" right.....here stress is similar as pressure....so if you want to know how the pressure is acting....then the force should be taken perpendicular to area....let take a small rectangular element....one side of pressure in x direction and the other side of the element the force acting should be perpendicular to the face and in opposite direction....because we are considering the change in element and also this the surface foce on the element....therefore the pressure for any element should be in opposite direction with respect to other

[@chianhuasi4946]

Newton's 3rd law of motion.

[@me_14_sagarshah36]

Can you still make it easier to understand ?

[@me_14_sagarshah36]

@@kalyanhp9742 can you still make it easier to understand

[@edutechguruengineeringlear4280]

@@me_14_sagarshah36 kzbin.info/www/bejne/bJqtop1pmbunjrs

[@Nishantraii]

Why f2 is is taken to be acting towards bend?

[@me_14_sagarshah36]

Why the (PA) at 2-2 exerts in oppositie direction ??

[@caleb9386]

How do we calculate the force exerted by the fluid on straight piece of pipe when the cross-section of the pipe is reducing from D1 to D2 and the fluid is flowing at 'x' m/s ?

[@edutechguruengineeringlear4280]

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[@cck0728]

Excellent video but why the "weight" of water was neglected as it exerts Fy force? Thanks.

[@cck0728]

@@devindersingh1603 Thanks for your kind reply. But it is not the case. Actually when we do analysis using "head"... Weight itself becomes per unit..... Weight is there but in the form of head (energy per unit weight)....

[@edutechguruengineeringlear4280]

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[@bober4279]

I really appreciate your work. Thank you one question we used the equation F=dp/dt but F=dp/dt=d(mv)/dt=v*dm/dt+m*dv/dt=(mass flow rate)*v + acceleration*m So what happened with that m*a term ?

[@anupamaray1]

sir please explain why Fx and Fy is consider negative...

[@sahandanushka7371]

6:27 Is the angle is theta or another symbol?

[@sanarehman9439]

Is there any use of height difference between inlet and outlet if it is given in question?

[@oscarpalomares370]

Wait are we neglecting gravitational force on the fluid? Good video, I had confusion on whether you can break pressure forces into components like the conventional momentum terms and this helped.

[@D_iv_ya]

this pipe is kept horizontal plane .so gravity acting in perpendicular to this plane( z direction ) and we are considering only x and y direction forces.

[@edutechguruengineeringlear4280]

@@D_iv_ya kzbin.info/www/bejne/bJqtop1pmbunjrs

[@shashwatpandey1371]

Thankyou! This is saving my exam💯🖤

[@jrimman]

Sir. How do we know the direction of force due to change in moment ? Is it the direction opposite to the flow?

[@edutechguruengineeringlear4280]

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[@klipklapklop3359]

why is pressure 2 force facing backwards if it is not a closed pipe

[@AshutoshKumar-pr7jb]

Sir but why pressure in opposite direction

[@Johanna.joseph]

Please any on explain end closed pressure pipe some time later the pressure is reducing or not.

[@gabygondo6323]

Sorry dear I have a question to share of your ok send me your WhatsApp number

[@mileslegend]

Amazing ... tomorrow I have a paper of fluid mechanics ...I will be glad to announce here..how I have crashed these exams ....NB:AM a last minute reader 🙈😁😁😁

[@dancingdynasty7663]

is it relevant for jee adv??

[@edutechguruengineeringlear4280]

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[@seyedalimehdizadegan4923]

Thank you so much sir. I also Like your beautiful indian accent

[@karanamnaveen1799]

It's reactive force but I cannot understand can u give a example why it is negative

[@robin3463]

It's negative because you always define which direction is positive and negative. In this case positive direction on the y axis is up, so force downwards has to be negative.

[@SandeepYadav-bj1zl]

Wow You made Quite Simple Sir Thanks for Teaching ❤️

[@PeachSword272]

Thank you very much sir. I was looking for this.

[@dineshswami9255]

Awesome explained sir💖💖

[@rbesfe]

Please note that when he says Q is mass flow rate, he means volumetric flow rate. Otherwise the units do not work out.

[@bober4279]

he said: ro*Q that is mass flow rate that's correct mate

[@wunsukwangdu8675]

P is Guage or absolute ??

[@BKIND-ic8hi]

Sir fy may be positive and weight of fluid w is downward direction ☝️☝☝

[@cck0728]

Yes, you are correct.

[@tanmanpeng5675]

Hi, may i know if the P1 and P2 are the same in Fx And Fy

[@edutechguruengineeringlear4280]

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[@dolapootunla7735]

why was -Fx used instead of +Fx same for y-axis??

[@niceguy4801]

Can you show the units sir

[@gooooalfootballcuts6194]

Thanks you are a saviour

[@k.safavi7842]

It seems, Fy should be in downward direction

[@raushanpianist]

it 's very helpful for us, thank you so much sir

[@malusimogashoa9598]

huge plug thanks alot

[@udaybhaskartiwari5874]

why weight force is not considered

[@abdulganeuwmohammed5966]

Thank you so much. But I think you didn't include the weight of the fluid, I mean the force exerted on the fluid by gravity. I didn't see that in your equations.

[@wavyfuture6422]

Why gravity is neglected??

[@ritikgoyal798]

Sudeep Sapkota 😂

[@tommysalami420]

very nice video it was a great help

[@kayaeki]

Thank for making these videos! Helped lots

[@tkatvibez9567]

Also, the direction of fx and fy don't matter. If the values are negative, the force just opposite of the drawn force

[@kayaeki]

Thanks bru

[@abhishek0o7]

Absolutely mate! Same procedure we apply in structure analysis..

[@ArvindKumar-hj7tj]

Sir please tell me how mass flow rate per unit time is found out as Row *Q.. Please explain in momentum equation in RHS

[@GontesBrowneye]

Volumetric flow rate (Q) * density (roe) = mass flow rate

[@khagendrakd222]

Thanks sir for the video ❤❤❤

[@suprabhatkumar7741]

Sir we r finding force exerted by fluid then why didn't u consider Fx rather than (-)Fx

[@SeekTheTruthAndTruth]

Rahul Kumar brother you are right in the sense that we have to calculate force on the bend but you got to remember we are applying momentum equation on the fluid not on bend .After you calculate the force you simply do the reversal to find it on the bend.

[@ujasdiyora441]

Aqif bhat yes we are Applying force equation on fluid. Then we have taken here p1A1 force in -x direction . But that force is acted by fluid on bend. But rather we would take negetive of all pressure force we have taken here.? We have to take (-p1A1) and (+p2A2cos(thethha).)

[@SeekTheTruthAndTruth]

Diyora Ujas brother I can see clearly that P1A1 is being applied in the equation as a pressure force on fluid in the +X direction. I don't think we need to take P A1 in -x direction when here our sole intention is to consider momentum change of fluid in +x direction.

[@harleylord2752]

@@SeekTheTruthAndTruth plz give your contact number

[@harichannel9872]

WHY P2 IS IN OPPOSITE DIRECTION

[@benwoods3838]

Thanks a lot really saved me

[@edutechguruengineeringlear4280]

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[@AKAUTOTOOL]

Thankxx sir Please make more such video for students easy way to learn

[@chaikinyen469]

thxx you clear my doubt

[@edutechguruengineeringlear4280]

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[@schwarzmann1]

Thank you so much for this

[@RahulChoudhary-rq5du]

What is volume of the bend??

[@deepaksharma-to4ot]

Sir ur video is very nice plz make video on momentum correction factor in fluid

[@isacfiorotti5199]

Thank you! Great work explaining this problem. :)

[@edutechguruengineeringlear4280]

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[@driesvanranst3440]

Thanks so much!

[@anilaxsus6376]

is gravity neglected

[@edutechguruengineeringlear4280]

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[@PaKPooM1726]

good quality.

[@kunalnirbhavne9330]

We consider gauge or absolute pressure in solving through Bernoulli's eqn

[@IrfanNasir]

Thank you very much sir,

[@Inspirewithharsh]

There will be +Fx instead of -Fx

[@peteranesu8870]

Thank you

[@rabimarasini9970]

dhanyabad sir

[@aadarshpothineni1130]

Thank you sir

[@jbchapm]

you rock

[@edutechguruengineeringlear4280]

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[@ganeshmotamarri5130]

Y neglecting weight of water

[@shivasmart967]

tq sir

[@edutechguruengineeringlear4280]

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[@OMPRAKASHPATEL-zi2bk]

It is nozzle not diffuser

[@pratikkumarjha5995]

Nice

[@sandhyasharma5168]

There is a confusion regarding the sign of force so, explanation see= hum log force exertedby moving fluid on the bend is +fx ok, now consider the force equilibrium for the moving fluid uske upar jo forces act ho rhe hai wah hai due to pressure, due to pipe bend(-) which is equivalent to the rate of change of momentum in the respective direction and regarding gravity to hum log forces ki analysis as a control volume man kar karte hai jiske upar saare forces act karte hai us case main hum ise Newtonian body ki tarah lekar chalte hain and moreover gravity ka significance jabhi aayega agar us body ka acceleration find karna ho

[@Human-kp5ze]

Check fx.

[@deepaksingh-bo4mv]

very explained

[@Inspirewithharsh]

Force balance is somehow I think is not right

[@prasenjitdas4996]

Thank you very much sir

[@edutechguruengineeringlear4280]

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[@chamudigamage7597]

Thank you sir