Do Pumps Create Pressure or Flow?
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Published 2021-05-04
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There’s a popular and persistent saying that pumps only create flow in a fluid, and resistance to that flow is what creates the pressure in a pipe. This video goes into some details about how two kinds of pumps work: centrifugal pumps and positive displacement pumps.
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This is not engineering advice. Everything here is for informational and entertainment purposes only. Contact an engineer licensed to practice in your area if you need professional advice or services. All non-licensed clips used for fair use commentary, criticism, and educational purposes.
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All Comments (21)
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💧 Give me your best pump mantras. I'll meditate on the best one. 📺 Don't forget to jump on this great Nebula/CuriosityStream deal. curiositystream.com/practicalengineering
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A good rule of thumb is: "If you want an accurate one-liner saying, don`t get involved in hydrodynamics".
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This video operates where my interest curve and the supply curve intersect.
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As a professional engineer who worked at a water and waste-water utility for over 30 years, let me congratulate you for an excellent presentation. I would really like to see a future presentation on cavitation.
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"This isn't rocket science". I'm not a rocket surgeon, but I'm pretty sure pumps and fluid dynamics are a big part of at least designing rocket engines and fuel tanks.
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It actually is rocket science too. The big boy rockets all use pumps for propellant flow and thrust control :)) 0:32
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i need that on a tshirt asap!
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As a retired mechanical engineer, indeed pump selection for industrial applications is far from a simple task. Great video
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Even though this is aimed a lot more at civil engineering concepts, for me who is studying chemical engineering, this channel is so informative to conceptualize and understand physical setups of a bunch of engineering concepts. Thank you for the content!
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"Not a great catchphrase, but it is accurate." Spoken like a true engineer.
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I'm an electrician. Everytime I hear it's not the voltage that kills you, it's the current, I slap them in the face and tell them it wasn't the velocity of my hand that hurt them, but the weight of it. Of course the real answer is it's the MOMENTUM of the hand i.e POWER that hurts you.
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I’m a certified fluid power hydraulic specialist (CFPHS), and I really liked how you tackled this topic. Definitely showing it to my friends
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Rewatching this video after measuring I-V curves for lots of small solar panels is really making the similarities between water and electricity stand out. Photovoltaic output is incredibly load-dependant (that's why we use MPPT controllers for all but the most basic solar setups) and the curve describing the output naturally looks a lot like the pressure vs flow rate graphs you showed of the pumps.
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This is basically the hydraulic version of the discussion whether an electric source provides current or voltage. And as my university teacher likes to say: "what they have taught you in school might not be wrong, but the full story is a lot more complicated".
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When I was in college I understood it as, pumps create pressure which gives fluid energy, difference in pressure causes velocity/flow.
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This was a really great video, thanks! Loved the graphs!
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Your new vs old pump mantra is like the "money doesn't buy happiness" one. I revised that phrase to say "money can't directly purchase happiness or friends because they aren't purchasable items, but it can however make your life easier and facilitate many things that do make you happy and will overall improve your happiness versus your position if you didn't have it."
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I work for a pump company, and I want to show this to all our customers who I swear don't understand pumps. Well done. I look forward to your future pump videos!
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Its like the argument, "its not the fall that kills you, its the sudden stop at the end"
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“Internet pump enthusiast” - cracked me up!!
