Water and oil are in a tank, calculate pressure at the bottom

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Engineer4Free

Engineer4Free

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Fluid Mechanics Tutorial: Water and oil are in a tank, calculate pressure at the bottom
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@williammatthewjosephgenova9802
@williammatthewjosephgenova9802 Жыл бұрын
Excellent! Can you please show how to calculate horizontal pressures at various depths when using oil and water?
@joysao1348
@joysao1348 3 жыл бұрын
Nice and easy to understand explanation, thanks 👍
@darylstricker1353
@darylstricker1353 9 жыл бұрын
nice video - the result given would be in absolute pressure of course (not gauge pressure) just for peoples reference
@danielasepulveda9143
@danielasepulveda9143 Жыл бұрын
How would you find the force on the sides of the container. Would you need to integrate and add the oil then the water. Or there a specific way to do so?
@CptMaahir
@CptMaahir 4 жыл бұрын
in the equation p1 = p0+ pgh how come you need to add the p0 into it?
@Engineer4Free
@Engineer4Free 4 жыл бұрын
As you go deeper into a fluid, the pressure increases. But it's relative. The increase is from the higher point to the lower point. The surface of the uppermost point is in contact with the atmosphere and therefor experiences atmospheric pressure. So if the increase in pressure as we go deeper into the fluid is relative to the top pressure we need to add the increase to the value of the top pressure. P0 in this case is Patm, so that's why we initially add the 101kPam. Should note that we're talking about absolute pressure here. Hope that helps to clarify
@apih_7901
@apih_7901 3 жыл бұрын
how to calculate gauge pressure if same built question
@Dogface1984
@Dogface1984 5 жыл бұрын
Would this be set up differently if the tank was a cylinder with a specific diameter?
@Engineer4Free
@Engineer4Free 5 жыл бұрын
Yes, it’s weird but true
@Dogface1984
@Dogface1984 5 жыл бұрын
Thanks
@edgarasm8907
@edgarasm8907 4 жыл бұрын
Only force of that pressure will depend on diameter (area)
@bijuisaac3637
@bijuisaac3637 2 жыл бұрын
If the tank is full and covered with a lid , will Patm be zero?
@bennett7326
@bennett7326 3 жыл бұрын
how would you find the force on the bottom of the tank in N?
@Engineer4Free
@Engineer4Free 3 жыл бұрын
Pressure = force * area. You know the pressure and area, so can just rearrange for force. This would basically be the weight of the water.
@godwingeorgemartin1565
@godwingeorgemartin1565 4 жыл бұрын
What is the pressure at the interference of these two fluids
@Engineer4Free
@Engineer4Free 4 жыл бұрын
Take it as equal to P1 = 112.7 kPa absolute.
@ricadizon9425
@ricadizon9425 3 жыл бұрын
Make more videos like this please
@dakilanghambog1865
@dakilanghambog1865 4 жыл бұрын
What if the tank is elevated?
@Engineer4Free
@Engineer4Free 4 жыл бұрын
If it's a small elevation, like a few metres, then the change in Patm will be so small that it is insignificant and the pressure at the bottom of the tank will effectively be unchanged. If you take it to the top of Mt. Everest vs sea level you will have a significt difference. Check what the value of Patm is that you've been given and go with that. It's just common to assume Patm = 101kPa for simple problems like this
@ronode
@ronode 2 жыл бұрын
Thank you ❤️
@junghoainam21
@junghoainam21 5 жыл бұрын
so the pressure at the bottom is P2 or P1+P2 could u tell me ?
@Engineer4Free
@Engineer4Free 5 жыл бұрын
The pressure at the bottom = P2. P2 = Patm + ρgh {oil} + ρgh {water}.
@junghoainam21
@junghoainam21 5 жыл бұрын
@@Engineer4Free So what if they ask for the gauge pressure at the bottom ?
@Engineer4Free
@Engineer4Free 5 жыл бұрын
@@junghoainam21 the absolute pressure at the bottom is P2 = 137kPa. Gauge pressure = absolute pressure - atmospheric pressure, so the gauge pressure at the bottom is 137 kPa - 101 kPa = 36 kPa
@reedee9006
@reedee9006 4 жыл бұрын
@@Engineer4Free gauge pressure = absolute pressure - atmospheric pressure? Isn't the pressure on the top of water is that pressure of oil? P.s. Just clarifying. Hehe
@edgarasm8907
@edgarasm8907 4 жыл бұрын
Does a water density in the middle of water (height 1.25 m) is less then density at the bottom? I mean water density is not const., but the difference is so small so we ingore it? Because density also depends on pressure, not only by temperature.
@Engineer4Free
@Engineer4Free 4 жыл бұрын
This video is at a 1st/2nd year (freshmen/sophomore) level. Take density of the fluid to be constant at all depths.
@BruhBruh-ws5zu
@BruhBruh-ws5zu 2 жыл бұрын
yeah bruh I think this is for ap physics students like myself, not fully fledged engineers with a professional degree
@IsmailAli-zc4fm
@IsmailAli-zc4fm 3 жыл бұрын
if the shape of the tank was not constant how would that affect the pressure ? like lets say it was a square then a cylinder?
@fatinnabihah2120
@fatinnabihah2120 3 жыл бұрын
What is the actual value of atmosphere pressure? 101kPa or 101325Pa? I'm confuse
@Engineer4Free
@Engineer4Free 3 жыл бұрын
101kPa is just rounded, 101,325 Pa = 101.325 kPa, but it's common in first year classes to round down simply to 101kPa (101,000 Pa) for atmospheric pressure. Check the expectations of your textbook or professor for which value they want you to use.
@andrewchoi2780
@andrewchoi2780 6 жыл бұрын
Damn, it's really the little things that suddenly cause things to click. You saying that SG of 0.8 means it will be 80% as dense as water suddenly made specific gravity fall into place for me.
@Engineer4Free
@Engineer4Free 6 жыл бұрын
Awesome, glad I could help you get that! Stuff can seem more complicated than it actually is.
@bijuisaac3637
@bijuisaac3637 2 жыл бұрын
Is there any pressure difference between closed and open water tank which is full of water?
@MaxLegroom1134
@MaxLegroom1134 Жыл бұрын
I beleive so, when tank is closed you don’t need to factor in atmospheric pressure.
@jruby805
@jruby805 9 жыл бұрын
If pressure at atm was zero this would totally change your answer right? Don't you usually assume Pressure of atm to be zero? Thanks. Great video!!
@Engineer4Free
@Engineer4Free 9 жыл бұрын
jruby805 Hey I think you are getting gauge pressure and absolute pressure mixed up. Its all a matter of where you define your "zero point" when talking about gauge pressure. Absolute pressure is literally how much pressure you have compared to a perfect vacuum. If you are experiencing "0 kPa absolute" then you are probably in space. If you are experiencing "101 kPa absolute" then you are probably standing outdoors around sea level. A pressure of "0 kPa gauge" would mean that you have the same pressure as the reference pressure that you defined as your zero for this particular measurement. If you define atmospheric pressure as your reference, then a gauge pressure of 0 kPa would = Patm = "101 kPa absolute". The pressure at the bottom of the tank in this video is "137 kPA absolute", or could be "36 kPa gauge" if you defined atmospheric pressure as your reference aka "0 kPa gauge" (because 137-101=36). I made another video explaining the difference between gauge and absolute pressure, you can see it here: kzbin.info/www/bejne/pYCwq4WwpbN1e6c Hope that helps clear it up!
@jruby805
@jruby805 9 жыл бұрын
Engineer4Free ahhhhhhhhh. Man, you're good. Thanks for clearing that up. You have no idea how such a big help this was!! Thank you so much!! And thanks for the other video, will check it out right now!!
@redgefleming1535
@redgefleming1535 5 жыл бұрын
In other words gauge pressure means that you should ignore the atmospheric pressure and focus on the system
@thierryosborne1607
@thierryosborne1607 6 жыл бұрын
Why applying Patm ? I mean it surrounds the whole tank so its effet cancels itself no ?
@Engineer4Free
@Engineer4Free 6 жыл бұрын
The tank is only open to the atmosphere are the top
@azizizizi1404
@azizizizi1404 5 жыл бұрын
Why oil has higher density than water? Pls reply me. We know that an object with high density sink. (sorry bad englishg
@Engineer4Free
@Engineer4Free 5 жыл бұрын
The oil in this video has Specific Gravity (SG) = 0.8 which means it is equal to only 80% of the density of water. That's why the oil is on top and the water is below in this case, because the water has a higher density than oil, not the other way around.
@purpohpenguin
@purpohpenguin 7 жыл бұрын
What if the container is closed at the top?
@shreeshtripathi_sona
@shreeshtripathi_sona 6 жыл бұрын
only "Po" ie (the pressure due to atm) wont affect anymore, rest stays the same
@sanigga
@sanigga 4 жыл бұрын
the only thing that will happen is that p knot will become zero
@thierryosborne1607
@thierryosborne1607 6 жыл бұрын
What if there is a mixer in the tank, is it still the same calculations ?
@pradipbehera4191
@pradipbehera4191 5 жыл бұрын
you should know density of mixer
@ashthepokemonmaster2375
@ashthepokemonmaster2375 5 жыл бұрын
@@pradipbehera4191 no u should know the density of the mixture formed, not the steel mixer
@pradipbehera4191
@pradipbehera4191 5 жыл бұрын
@@ashthepokemonmaster2375 u want to say still mixer . It doesn't mean anything. Fluids having different density don't mix each other just like explained in given video ,u may take example of oceans junction (central indian triple junction). It don't mix in horizontally also...
@adriansepulveda6295
@adriansepulveda6295 8 жыл бұрын
what is the pressure head base of a 70foot tank fill to the top
@pradipbehera4191
@pradipbehera4191 5 жыл бұрын
310.1538 kPa
@markdoto1432
@markdoto1432 6 жыл бұрын
Sir What is the instance when patm is not considered??
@Engineer4Free
@Engineer4Free 6 жыл бұрын
If no part of the fluid column is exposed to the atmosphere. It could be possible in a manometer type setup where a piston is acting on one end of the the fluid and a known pressure is in the bulb on the other side. I've got a few videos on manometers here: kzbin.info/aero/PLOAuB8dR35oeOIPMOBH6hjwobuIJHPKSN but all of them involve Patm.
@Vivek-iy6rj
@Vivek-iy6rj 7 жыл бұрын
could you tell me what is formula when we measure interface level by displacer type level transmitter?
@harshadmahulkar7941
@harshadmahulkar7941 5 жыл бұрын
Good
@Engineer4Free
@Engineer4Free 5 жыл бұрын
Thanks
@engineertres8783
@engineertres8783 5 жыл бұрын
what if the height of the oil was not given? what shall i do? should i use Pgh?
@Engineer4Free
@Engineer4Free 5 жыл бұрын
I these problems, you will only be given a maximum of one unknown, so just rearrange for the missing value
@engineertres8783
@engineertres8783 5 жыл бұрын
@@Engineer4Free thanks a lot
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