engineerguy - 2019-05-22
Bill describes how the minimization of surface area and inertia compete to form droplets. He then shows how engineers use this knowledge to create precisely-sized droplets in a commercial inkjet printer -- the type used to print expiration dates on food packages.
The don is back.
@engineerguy I saw a video of you a year ago where you explained cans. after that time passed and I had that video in mind every time i drank from a can. yesterday that same exact video showed up on my feed so I watched it again and it was as good as before. So I continued watching video after video and Ive got to say that you did a great job making all these great videos. Thank you
engineerguy congrats on 1 mil on the yt channel btw!
@engineerguy I'm happy to hear you're not done doing videos! I never knew I liked engineering until I saw your presentations. Absolutely fascinating history, facts and explanations
@engineerguy life sometimes gets in the way mate... TBH.. just gold to hear you're ok.
@engineerguy Why aren't your videos monetised? I don't see any ads??
I almost jumped out of my chair when I saw a new video was posted.
Hi Mike, the CEO of the Useless Duck Company.
Great video as usual - thanks Bill
Ur animations is what I wish to make like them.
For those wondering: he’s writing a book and that’s why no content
@engineerguy oof now that's a killer combo
@engineerguy Hey there is a "community" page on youtube. You could post an update there. Thanks for your excellent content.
Good idea.
@engineerguy we miss your videos.
@engineerguy you still here are dead
This channel is the one I will always stay subscribed to no matter how long between uploads. I love it this much.
Always worth the wait
This channel is really underrated and I've Heard your making a new series, I'm really looking forward to it.
Do you have any secondary media like twitter (or even the yt community post thing) where you can keep us updated. Best of luck on your new project
Dr Hammack - I find your video series to be the finest engineering “mini” lectures on the internet. I hope they will continue in future. These lectures identify highly interesting phenomenon, then take on the challenge of identifying history, relevance, and underlying fundamental physics in detail, all without over simplification that would render the discussion trivial. Yet the tale is told briefly with grace and ability, inviting further investigation by the listener. Well done.
Mark Heslep, PE
Always a clear cut explanation. You are the real engineering guy
Fantastic Video engineerguy. Thank you. Quick question - "the surface area to volume ratio of a sphere is double that of an optimised cylinder with the same radius - should it not be volume to surface area ratio? i.e. more volume per surface area, not more surface area per volume?
Benjamin Lunsky I noticed that error too, searched comments and found yours.
This video has laminar flow, somebody call Destin from Smarter Everyday!
Squee Destin
It's actually the opposite of laminar flow. The flow of molecules isn't uniform, like he said it wobbles with parts of the flow moving upwards and downwards
I'm struggling with your statement @1:48, "The surface area to volume ratio of a sphere is double that of an optimized cylinder with the same radius". If you include the ends of the cylinder the surface area to volume ratio is the same as that of a sphere with the same radius, 3/r. If you don't include the ends the sa/vol is 2/3 that of the sphere of the same radius, 2/r.
For the same volume the sphere has 0.87 times the sa/vol ratio of the cylinder with ends and 1.31 times the sa/vol ratio of the cylinder ignoring the ends. This cold explain why the flow is continuous until it starts to neck through vibration or imperfect flow.
BILL WHERE ARE YOU?? 😭😭😭
This comment section makes me so happy! Everyone loves the engineer guy :)
I'm not an engineer and never really thought about droplets before, but wow, I genuinely found this video fascinating. Thank you!
I absolutely love how clear and concise you are, with keeping things simple for the sake of brevity. Awesome stuff!!
I've always wondered about this. Another thorough - and thoroughly entertaining - explanation. Thanks Bill, and welcome back!
I wish the video was longer! ALWAYS fascinating and informative videos! 2-thumbs up!
I love this channel. He has a PERFECT way of explaining things. Great stuff!
I always love seeing your videos in my subscription tab. 👍
Man I was just going to say, Ink Jet Printers. The Videojet printers I work with use a crystal that vibrates at 60,000hz, thus making 60,000 drops per second. There's an LED light flashing at the same rate allowing one to actually see the drop formation using a loupe. After that, the charge tunnel and deflection plate work similarly to a CRT.
Thank god you are back. Always amazed at how you are able to breakdown and explain complex ideas to the point its easy to understand
People didn't know how to read and we got the Catholic church. KNOWLEDGE IS POWER. Explain to us Engineer Guy! Glad you're back!
The Feynman technique in real time.
Another quality video.
OK, I’ll say it…
This is one of the reasons the rim of the toilet bowl gets dirty.
where are you? we need you
Bill Bill bill Bill! Bill Hammock The Engineer Guy!
Always excited to see a new video from you! <3
Great explanation Bill. Admire your work. Keep it up.
As everyone is saying, we're really glad to see more uploads from you. However, I have a couple of questions. You mention that the liquid is more thermodynamically stable with a lower surface area, but also that the sphere has a higher surface area to volume ratio. Wouldn't the cylinder then be more thermodynamically stable? Furthermore, the liquid is "fighting" inertia to become more stable, so why do we get droplets at the bottom given the liquid moves faster than on top, due to gravity? I would also love to know why the wobbling increases at the bottom of the stream, which might answer both of my questions. Thank you for these amazing videos!
This Video was brought to you by Big Almond.
The don is gone again...
Great presentation. Thanks
I bet you would have liked to work at Xerox. We were doing this in the lab in the mid 70's (although it went unnoticed.) We used a video camera, strobe and microscope to fine tune the signal modulating the droplets.
In 1970 we experimented with using a HeNe laser to expose a flat Xerographic plate as a feasibility before incorporating a Xerographic drum and galvo scanning . . . I am just saying I bet you would have liked working with these guys. Ahh the good ole days. I would love to touch base on the "Xerox Redeye project" and see where everyone landed.
Answers to questions I didn't know I wanted answered. Amazing as always!
I thought inkjet printers worked by witchcraft. It sounds more feasible than precisely vibrating crystals and electromagnetism.
Laser printers work on witchcraft. Inkjet on crystals and such
We await for his return
One day
I hope you are doing well during these times!
This youtube channel is definitely one of the best accounts made on any platform on the internet
Speechless this video was just fantastic, great explanations great everything.
Bill, it's been a year now, are you okay? Missing the engineer guy content.
Miss you, man. Hope you and your family are doing well <3
Love your videos Bill! Clear, concise, and entertaining. Looking forward to the next one!
I'm always amazed how something that looks so simple is not only much more complex, but can require many decades if not centuries of research to achieve.
In fact if you look around yourself in a house youll notice that absolutely EVERYTHING that surrounds you is unbelievably complex and each little or big thing requires its own science and almost all life worth to create it... This is mind bogging...
I love this channel. The presenter is delightful. His delivery reminds me of a favourite uncle, or maybe your most fondly remembered teacher in high-school. The channel dose not upload very often but every video is well worth my time.
I am a chemical engineering student and you’re inspiring.
Wooo Hooo!!! Great to see you back Bill! Your videos are always interesting and informative, and fun to watch.
The only thing i understood is "im bill hammack, the engineer guy"
Didn't believe my eyes at first. He's back!
for sure, I had to read it twice before I clicked.
Will he ever come back?😭
The Engineering Guy never ceases to astound. He pronounces "almond" as ALE-mund (3:53). Simply fascinating.
We've missed you! Glad to see another video. While there are many other engineers on YouTube, there is only 1 "engineerguy".
Welcome back. I have been missing your videos for sometime
I missed this in my life. How wonderful it is to have such low comfy voices talk about science
Jacob Dino - 2020-07-10
When the world needed him most, he vanished
Cedric Hua - 2020-09-27
@No Username yuppers... hope he comes back soon
Phil Cassidy - 2020-10-06
@No Username He can write children? Now that's some advanced engineering.
Carter Johnson - 2020-10-08
@Phil Cassidy
Maybe the most advanced 3D printer could do it. I legitimately laughed when I read your comment.
LordDragox412 - 2020-10-09
@Phil Cassidy That's no engineering, he's just been learning how to write code in his off-time, so when his grandchildren stopped visited him, he wrote his own... Now that's what I call modern-day problem solving! >:P
Arwah Sapi - 2020-10-10
He must be preparing something awesome for the next upload