Pressure Confusion? Hydrostatic vs Static vs Dynamic vs Stagnation Pressure? on Fluid Dynamics.

When you surround yourself in the world of fluid mechanics you shall encounter many problems related to pressure. Hydrostatic and static pressure , they both sounds same but tbh they are different kinds of pressure. Also you shall see that there are 2 kinds of Hydrostatic pressure one real other imaginary. This animation video shall clarify the related problem, "What is the difference between static pressure and hydrostatic pressure? " and describe the concept of stagnation as well as dynamic pressure.

[@mahdiyousef4516]

It has always been bothering me since I took mechanics of fluid class that I dont understand the difference between hydrostatic pressure and static pressure, and now you come to explain it simply like that! I thank you from the bottom of my heart and god bless you.😍😍

[@carlaabouhadir9485]

😍😍

[@tharakanewan3544]

It took several times replay to understand. But i guess it's me. By the way very nice explanation. Keep up the good work.

[@NiLTime]

Thanks you ^^

[@suryakiran3085]

nah iam doing the same .. maybe lack of basics ..

[@loveh6094]

Amazing video, amazing explanation. You are my goddamn hero! 😭 I was having so much trouble with the pressures, specifically elevation head vs pressure head

[@JEE-zm3sh]

I used to be very confused about the pressure terms.Thank you very much, I still am.

[@digguscience]

Good explanation of stagnation pressure

[@physicslover1950]

Wow Ma'am that was quitely brilliant . 🌺🌺 God bless you 💐💐💐 you have cleared our misconceptions wow. You voice was timed perfectly 🌹🌹 I think you mean that in case of liquids the static pressure is analogous to that of gases but the difference is that gases exert static pressure of the surface of the container in which they are present whereas liquids exert static pressure on its own free surface formed due to surface tension. Am I right Ma'am? The most beautiful concept you told us was that the stagnation pressure occurs only when the relative velocity between the pilot tube and the flowing fluid is not zero. I mostly loved the concept of accelerating fluid in an open channel flow. You very beautifully demonstrayed the fact most people don't know that the formula P = pgh can't be applied directly to an accelerated flow in an open channel. The value of hydrostatic pressure varies with the lenght of the channel ( Parallel to fluid flow ) in case of accelerated flow. I just wanted to ask a question about hydrostatic pressure in a pipe when the flow is accelerated. Since the pipe is a closed flow so can we use P = pgh formula for accelerated flow in a closed pipe?

[@NiLTime]

No you cannot use hydrostatic pressure formula for accelerated fluid on pipe too. I suggest you read about "Euler’s Equations of Motion for fluid" here that thing are proved... according to my research.... It says that "in the vertical direction, the pressure is the same as if the fluid were static". Also these hydrostatic formula are for straight stream line for curved streamline these hydrostatic formula would be wrong. ^^

[@physicslover1950]

@@NiLTime But if the pipe through with the fluid is flowing is placed in a strong gravitational field then! 😢😢 The hydrostatic ( varies with depth) pressure at the top of the pipe should be less than the hydrostatic pressure at the bottom of the pipe. Isn't it?

[@NiLTime]

@@physicslover1950 Ofcourse buddy ^^ .

[@sharemarketkoninja6929]

Video of decade. I was looking forsuch video since 2013. 😅

[@sushantparekar5483]

Who says online learning is ineffective if used animation concept remains till death beautifully explained animations are only reasons that cartoons are more effective

[@soumyaranjanpanigrah]

Great video. Please explain what will be the internal pressure in case of the liquid flowing through pipe, since you mentioned static pressure in enclosed flow will be internal pressure + hydrostatic pressure. Will it be same as the dynamic pressure??

[@mithun216]

Excellent explanation, this is what I am searching for

[@aniljangra3107]

Such beautiful explanation ...... Really awesome...... thanks 🙏

[@sirturdaloter141]

Nice explanation of what gravity truly is.

[@emilymaze6616]

is it possible to request certain topics in fluid mechanics for upcoming videos?

[@NiLTime]

Yeah ofcourse. Will try my best... If I know about the topic. I also need some time as I have my own topic that needs rendering ^^ .

[@captainamericawhyso5917]

Great video THANK YOU really I had these pressure terms confused for a long time. I need to ask though: What is the static pressure when you put the piezometer in a venturi tube? Since the velocity increases we learn that static pressure decreases, but wouldn't the liquid be more pressurized by the tube when the tube gets smaller?

[@digguscience]

Agree strongly

[@rhashmi1]

Beautifully explained.

[@ductran7581]

I think that there is a confuse that both dynamic and static pressure will contribute force on horizontal that perpendicular to adjacent layer element inside fluid. Static pressure exist due to collision of molecular but dynamic pressure due to kinetic energy of bulk fluid so it can exert force due to collision between adjacent layer on horizontal

[@NiLTime]

sorrry Mr. Duc, I have less knowledge about micro theory :3 . You are more knowledgeable than me :D

[@rez8o352]

Thank you. The heights h and z were causing me problems.

[@saurabhsingh4191]

thanks itachi for this video you have proved once again u are truly a legend :D :P

[@NiLTime]

haha your welcome ^^

[@sasidharputtaparthi1350]

One of the best explanations...👌👌👌

[@physicslover1950]

At 3:42 of you video, the concept is still not clear in my mind . You said that PRESSURIZED flow makes static pressure very greater than hydrostatic pressure . Why? I mean that the pressure reading at the top of the container must be slightly less than that at the bottom of the container. Or Will they both be equal ?

[@NiLTime]

I mean the static pressure on Pipe will be greater than static pressure compared to open-channel flow.... Look at open-channel flow, at water surface the pressure is equal to atmospheric pressure but on inner tube pressure shall be greater than atmospheric pressure due to pressurized flow. .... of course your statement is true "the pressure reading at the top of the container must be slightly less than that at the bottom of the container. ", if pipe has small diameter... ^^

[@physicslover1950]

@@NiLTime What 😨😨😨 ? You imposed a condition that the diameter should be small. What will happen if the diameter ( and cross section ) of pipe is very large?

[@NiLTime]

@Physics Lover My logic is if diameter is long then Hydrostatic pressure varies with fluid depth .. .. For small diameter we can neglect hydrostatic height ( some formula are even derived from this assumption)... Well its my theory who knows .. might be wrong 😂 😂 . By the way I am student like you so never trust my judgement 100% 😂 .

[@physicslover1950]

@@NiLTime Yes you are right Ma'am. The diameter must be small for our assumption to be valid.

[@ductran7581]

@@NiLTime but in open channel flow, the flow not pressurized the side of wall?

[@charleeharris2976]

Awesome videos! keep em coming

[@mddelman]

Do you have time to answer a question for me? I have a cylinder filled with water, There's a small hole in the top that I can open and close. There's a hole in the bottom that I can open and close, just to control whether or not water is released. If both holes are closed, obviously no water is released. If the cylinder is filled to the top and I open the bottom hole, no water is released until I open the hole at the top. If I open the top hole very briefly, some water is released but stops very quickly after I close the hole at the top. If the cylinder is only two-thirds full, the flow continues for a longer amount of time after I close the top hole. If it's one-third full, it takes an even longer time to stop flowing. Can you tell me why it works this way? I'd be most appreciative if you can answer this question. Thanks very much!

[@jorgeh4336]

So static pressure is the lateral pressure on the inner surface of pipe.

[@Yuji.Itadori..Abhishek]

Thanks for clearing my concepts by every beautiful videos 🥰

[@NiLTime]

Aww ... Thank you ..

[@umutyldrm9696]

Dude sick animations but horrific dubbing. Wish you had'nt use that bot. It is really frustating.

[@NiLTime]

aww ... sorry for that . anyways Real Dubbing Shall come soon .. dont worry ^^ .

[@umutyldrm9696]

@@NiLTime Np dude this video really helped me just a friendly rewiew. There is a lack of animations like that in youtube with a proper dub your channel can grow rapidly

[@dower85]

I was thinking the same! Great video!

[@AMITKUMAR-jw4zn]

helpful for me in extreme way.thank you mam

[@user-mj9nj8zc4b]

Thanks for the great video. However, I have a question about dynamic pressure in outer flow. For example, when a wave hit a structure which is above the sea level (i.e. there is no hydrostatic pressure on the structure), is the dynamic pressure (1/2*rho*u^2) of the wave equal to its total pressure?

[@carultch]

When water stagnates against a solid object, the absolute pressure will equal P0 + 1/2*rho*v^2 (the stagnation pressure plus atmospheric pressure), while the pressure relative to local atmosphere will be 1/2*rho*v^2 (the stagnation pressure).

[@Kevin-ly2be]

cool video and even better if replacing the SIRI tone😂

[@danielodeliro2412]

Thank u Can u explain thermodynamic pressure and mechanical pressure and mean pressure and average pressure?

[@5afbi]

useful information thanks

[@Doofenshmirtz1088]

So the pressure in a pipe is greater than pressure in open channel? Even with same rate of flow?

[@sprinklerdesigner3436]

amazing work

[@gladiator8827]

Great mam

[@dylantuw8500]

Thank you for explanation

[@husamettinakar2297]

Thanks a lot sir!

[@mervinjean-louis2908]

👍

[@amankumar3022]

very clear

[@emilymaze6616]

woow this helped me so much!tyyy

[@JALAJDARPAN]

great,which software you've used for animation?

[@NiLTime]

Blender buddy ^^

[@adithyanaik8497]

🔥🔥🙏

[@karlolelas847]

simply don't call that term (rho*g*z) hydrostatic pressure, call it what it is, the density of the potential energy at the point of interest

[@gaithhalloum2076]

Thank you 💓💓💓💓💓

[@yiluoli6890]

The fact that the two terms cancel out on RHS and LHS doens't mean they are not real pressure.

[@diwakarsaran3978]

Best.

[@sasandugarusinghe1863]

👍👍

[@athul5513]

Explanation is not good

[@ductran7581]

I think that there is a confuse that both dynamic and static pressure will contribute force on horizontal that perpendicular to adjacent layer element inside fluid. Static pressure exist due to collision of molecular but dynamic pressure due to kinetic energy of bulk fluid so it can exert force due to collision between adjacent layer on horizontal