Questions tagged [vacuum]
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What is the general equation or the steps to solve this problem? What are The amounts of each phase? Does it always reach the solid phase? [closed]
A vacuum pump that removes an amount of water vapor from a well-insulated tank. The tank initially contains 10 kg of liquid water at 40°C. Water evaporates because the pump decreases the water partial ...
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Work done during transient filling of a tank
This question stems from the online thermodynamics notes provided by web.mit.edu. I'm having some trouble understanding the example given of air expanding into a vacuum.
Consider the transient, ...
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what is the purpose of the fiberglass mat we get with some vacuum chambers?
I just bought a vacuum chamber which comes with a little square weaved fiberglass mat with some silicone rubber on it's border, and I can't find any information about it's use. Even in the comment ...
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How does the total pressure detector in a quadropole mass spectrometer work?
All quadropole mass spectrometers that I have seen provide a total pressure reading in addition to partial pressure readings for the selected masses.
The mechanism of the total pressure measurement is ...
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What type of sealants are used to seal vacuum chambers?
I'm building a vacuum chamber and I want to seal it
It's a 200mm^3 acrylic box
What type of sealant should I use?
For the door I guess it has to be something else then the walls because it need to be ...
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Vacuum effect in ansys
May i define vacuum as a negative pressure in ansys? This boiler tested for vacuum of 1520mbar.
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How do vacuum sealers work on a glass jar?
I came across this video and I don't understand how a vacuum sealer works on a sealed glass jar. In the video, you can see the glass jars are closed tightly with a lid. In this case, how does the air ...
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How does fumed silica attain a panel shape when used in vacuum insulated panels?
VIPs are shaped like fairly-flat boxes - cuboids - thick rectangles, for example 20 mm x 400 x 600 mm. If manufacturing started with a sheet of styrofoam - a thick rectangle - I would not be surprised ...
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Which of these systems should reach a better vacuum?
I'm trying to find a cheap manual vacuum pump for a sample transportation container that carries oxidizable samples of thin-film magnetic materials.
They already have a 15 nm Tantalum layer on top, so ...
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What contaminant materials should be avoided for reaching ultra-high vacuum?
This question relates to ultra-high vacuum chambers (order of ~10−10 mbar) in experimental setups.
[This question was asked at physics.stackexchange.com but removed due to being more about engineering....
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Extrapolating compressor curves for varying pump speeds
I'm currently working on modeling a vacuum system in which a pump is present. the pump is driven at a varying speed $\omega$. The manufacturer has only given the characteristic curve at a single speed ...
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Reverse Suspension Spring
So, in a car either a liquid or a gas gets compressed when force is applied to the suspension, and when the force is removed the gas/liquid tries to expand again which makes an effect like a spring,
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How can I make a vacuum pump to move rocks from one place to another?
I am trying to build a vacuum pump by myself and move rocks from one place to another. After some online search, I came across this video on Youtube. I am trying to build something like this. Can ...
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What kind of solenoid valve should I use for vacuum?
I'm currently working on a project in which I have to control 2 solenoid valves with arduino to switch the suction of a vacuum pump from one tube to another one (tried to explain it on the photo), I'...
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Vacuum Pump Specs
I have an airtight rigid chamber of volume V (~500 cu.ft.)
I want to remove the air from the chamber such that the internal pressure is equivalent to some P absolute atmospheric pressure (eg 3.46psia)
...
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Can a vacuum in a room increase the pressure in a tube?
Ok, So I work as a Marine Engineer but I do not have an engineering degree so I am having a hard time wrapping my head around this problem.
So currently on my ship we had a minor spill overboard from ...
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Using a thermos flask as a vacuum chamber
I want to create a vacuum chamber (-900 mbar) that can withstand heat (120°C).
I thought about using a pressure cooker similar to most DIY vacuum chambers, but then thought about using a large food ...
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How to sanitarily measure vacuum in milk?
I would like to measure the vacuum inside of a tube which will contain air and milk. A vacuum pump attached to the tube will maintain a vacuum of around 15 inHg.
Are there inexpensive sensors I can ...
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Is it possible/practical to mold a single hollow piece of carbon fiber with a sealed vacuum in the middle?
Let's say I design a simple piece of carbon fiber to be manufactured, in the shape of a simple cylinder with a diameter of 2cm and a height of 3cm (pretty small).
Is it possible and/or practical to ...
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Diffusion Pump Copper Cooling Coil Repair
I bought a Varian VHS-4 oil diffusion pump off of ebay about a year ago. The pump was stored outside by the people I bought it from so it suffered mostly cosmetic issues. Recently I have acquired all ...
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How do I increase negative air pressure without inhibiting airflow?
I would like to increase the vacuum power of my desoldering station. It’s a multifunction unit that includes a single vacuum pickup tool, hot air wand and desoldering gun. When using the desoldering ...
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Need help identifying this vacuum chamber flange
I know this might not be the most ideal place to ask this question, but I couldn't think of any place better.
I recently purchased a high vacuum chamber setup and have been disassembling it for ...
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Can I use a NPT fastened device to vacuum or 10^-2 Torr?
I am designing a flange to be use to maintain a pressure of 10-2 Torr for at least 3 months. I am using an o-ring seal from my (device) to the product weldment. I am looking for feedback on using NPT ...
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Increasing suction air flow with multiple pumps
I'm trying to build a small pick and place system using a suction cup and a 12V vacuum pump. The problem I'm having is that I'm not getting a good enough seal between the cup and the object, and I ...
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What is the equivalent of a capacitor in pneumatics?
I am building a desoldering gun. While the pump I am using provides decent suction, I would like a quick powerful vacuum burst to prevent the solder from solidifying in the nozzle rather than in the ...
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Does a pump like this exist?
I have a need for a pump that can suck a vapor from a 0.1 atm environment, and flow into a 1 atm environment. I know that there are electrical pumps that can do this. But are there any pumps like this ...
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Why do Nescafe's (and others'?) instant coffee jars have an inner seal with no "grip" for easy removal? [closed]
For a number of years now, I have been buying instant coffee products. Since the main brand has been Nescafe, this question is specifically about their products, even though I vaguely recall that the ...
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Calculating the Thickness of a Glass Tube which contains a Vacuum
I am looking for borosilicate glass tubes which can be used to contain a vacuum, so the top is sealed and then there is a vacuum pump at the bottom where the edges are also sealed, effectively making ...
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How fast could a Mini Cooper go in a vacuum?
Lord Evulz just stole the Earth's atmosphere. Our hero must race his trusty old Mini - which he had already prepared to be airtight, to ensure the tires do not explode, with pre-packaged oxygen to ...
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what is the most optimal cost effective diameter of a hyperloop tube ferrying ALL cargo between the US and EU [closed]
what is the most optimal cost effective diameter of a hyperloop housing vacuum tube housing hyperloops that can ferry ALL cargo currently travelling by air and sea to and from the US and Europe? ...
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Are most vaccum pumps isothermal?
Because adiabatic processes would lead to a high temperature rise due to the high reduction in pressure (from 1 atm to roughly 0 atm).
user20096
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Parts needed for controlling vacuum line pressure with pressurized nitrogen
I'm trying to assemble a simple setup where a line which is typically under vacuum can be pressurized by an external nitrogen supply, with this pressure regulated to less than 1 bar absolute (let's ...
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Is it possible design a portable high powered vacuum cleaner from a 12V DC motor?
I am currently designing a device that can pick up 20 kid's plastic balls from one box and transfer them all into another box. I have decided to use a vacuuming method to vacuum up the balls as my way ...
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Solid-liquid separation of a crystal slurry
Let me preface my question by saying I am a recent chemical engineering graduate and apologize if my inexperience shows.
I have designed a batch process which results in a water slurry stream ...
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giga/tera hertz timer? super fast spinning disc?
How would I go about detecting a very small amount time dilation
I want to accelerate something and measure the time dilation even if I reach 1km/s time dilation is very small but it looks just ...
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Dense, non-conductive UHV compatible material?
I'm not sure if this sort of question is appropriate here or not so please let me know if not!
I am designing a UHV vacuum system with a few interesting requirements. Inside of the vacuum chamber ...
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Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production ...
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deep vacuum in the 19th century
Nowadays deep vacuum pumps are fairly expensive, so I'm wondering: how could people reach the deep vacuum required for crookes tube or Geissler tubes in the 19th century ? (I'd be interested in ...
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Low cost feedthrough for an acrylic vacuum chamber
I am currently building myself a "hobby" vacuum chamber from 1 inch tickness acrylic sheets (I am very aware that acrylic is not the proper material). Inner dimensions of the the chamber is 40x40x40mm....
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What's the difference between a vacuum regulator and pressure regulator?
When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this.
I'm curious why vendors would ...
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Matching Output of Two Old Ring Compressors using Larger Single Unit
Disclaimer: I am new in the design of any fluid systems, however the selection of these units is critical for the electrical design I am responsible for this system, so please excuse me if my approach ...
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Inlet/outlet of a fridge compressor
I'm attempting to convert a fridge compressor into a vacuum pump, but it got me confused. There should be one inlet and one outlet I believe, but instead I have three, with the third being connected ...
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Vacuum Pump Issues
I seem to be having an issue with my little vacuum chamber I am building where I can only reach a base pressure of 6,000mTorr which is pretty high and am trying to figure out what is wrong. I have a ...
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Unsticking two glass elements fused by vacuum
I have an interlocking set of parts (1 and 2) which are used under vacuum. The last time I used it, the interface was wet with a mixture of water and ethanol. When the vacuum was removed, the two ...
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What is the formula to work out time to remove water from an open vessel with vacuum?
We have an open container sitting at 1000mm off the ground and a receiver tank sitting one metre above it. Container holds 400l of water and is connected to the receiver by 80mm id pipe. I was ...
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Generating a plasma via induction coil
I am trying to see if I can generate a plasma from an induction coil that is wrapped around a glass jar under vacuum. Tons of induction coil heatering circuits are on ebay for forging that can supply ...
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Could a vacuum tank ever be light enough to be boyant in air?
Given futuristic materials, could a structure ever be strong enough to contain a vacuum, yet light enough to provide buoyancy under standard atmospheric pressure?
Obviously "futuristic materials" is ...
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How to backfill vacuum chamber with low pressure gas
I have a vacuum chamber that I would like to backfill with 15 mTorr of argon. The problem with accomplishing this is that most pressure regulators can't do pressures that low. Are there regulators ...
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Proper way to power/use a vacuum cylinder?
I'm considering using a vacuum cylinder in my project (like these ones) to lift sheets of cardboard, but being new to mechanical engineering I'm not at all sure what I need to attach to operate one, ...
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How to quickly equalize pressure in a low pressure container?
Background: This is for a science project I'm creating where I use an airpump connected to a sealed 5gal pail bucket to create a vacuum. That vacuum is then connected to water source to "suck" liquid ...
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