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Questions tagged [vacuum]

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Fixture to hold and deliver current to crystal cathode in vacuum chamber

At my internship, I have a small crystal (about 5-8mm long by 2-5mm thick) that needs to be mounted in a vacuum chamber (which is 35mm on the inner diameter) to serve as a cathode with 1.0 to 1.5A of ...
monadoenchant's user avatar
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2 answers
39 views

are ducted fans better than turbines generating vaccum?

Basically I want to make a trap that sucks mosquitoes into a screen container for future studies, to do this I need to generate a vacuum and I need to choose whether to use a ducted fan (simpler) or ...
RHR's user avatar
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2 answers
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Is It Possible To Calculate The Internal Pressure Which A Sealed Glass Vessel Can Support, By Creating A Relative Vacuum Outside The Vessel?

Questions are bold with context surrounding them. I am not an engineer. Well, I'm a computer scientist but I don't do this. I do, however, brew kombucha and am looking to scale up. I have a new ...
Matthew Jendrasiak's user avatar
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What is the difference between side-channel/regenerative/ring/vortex blowers?

I am looking to write a Wikipedia article for side-channel blowers, but I have some big confusions that are not being alleviated by my attempts at research. There are certainly two distinct ways that ...
TWiz's user avatar
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Workholding vacuum only on a portion of the workpiece

Consider an almost-rigid part on a vacuum table. There is a flat gasket underneath the part that exposes some portion of the bottom side of the part to vacuum. Let's say 50% of the bottom surface is ...
Brian Bell's user avatar
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1 answer
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Designing a microwave based vacuum dehydration system

I am designing a Microwave based vacuum dehydration system for waste management sector and food dehydration. Currently I'm using a 3kw output 2.45GHz magnetron as heating element. My vacuum pump is an ...
Rohan Abraham Mathews's user avatar
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1 answer
35 views

Insulating value

The level of vacuum (rough, high, etc) in a vacuum insulating panel determines its insulating value (typically measured in U or R value). Does the VOLUME matter? That is, for the same level of vacuum ...
John Hume's user avatar
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Degradation of adhesives under temperature and vacuum due to outgassing

My question is specifically about outgassing of adhesives under vacuum. Does the adhesive eventually degrade (or vanish completely) due to outgassing? Even those adhesives classed as "low ...
user2660278's user avatar
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2011 Qianjiang Motorcycles 50cc engine assembly step by step?

Qianjiang is the MFG 201150cc moped What is the quickest way to start this engine? What needs to be installed? I have all parts plus extras, except for air box. I'm sure the vacuum hoses is going to ...
Spcblackwell's user avatar
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43 views

Contactless heating of levitated tungsten

I want to make a setup to melt tungsten. The best method I've come up with is using an induction heater to levitate and heat the tungsten, in a vacuum to prevent oxidation and limit heat transfer. I'...
LostXOR's user avatar
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Easy-to-clean Flux for soldering vacuum seals

If using solder to seal high and medium vacuum fittings made of brass, bronze, or stainless, are there any types of flux that are easier to clean than others to prevent vacuum contamination? I am only ...
DKNguyen's user avatar
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What is the maximum vacuum level achievable from heating up a metal in a vacuum chamber full of oxygen?

if a chamber were to be completely filled with oxygen gas only (let's say atmospheric presssure in a 1L vacuum chamber) and a piece of metal, maybe iron or maybe steel wool, is heated so it oxidizes, ...
asker's user avatar
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How this centrifugal pump works in creating a vacuum?

Stumbled upon this video (vacuum fryer commercial) It obviously using 2 centrifugal pump (large ones, most likely above 700 litres/min) to circulate the water inside condenser But then, these pumps ...
mande's user avatar
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1 answer
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Are vacuum actuated artificial muscles as hard to control as the pneumatic ones?

I was searching for questions on this stack and I found this one asking why pneumatic/hydraulic artificial muscle robots aren't common, TLDR: the reason is that it is incredible hard to control them. ...
Fulano's user avatar
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2 answers
180 views

Vacuum pump clanking, pulling oil into line

About 3.5 weeks ago I bought a new vacuum pump (VEVOR 8 CFM Vacuum Pump 2 Stage). It's started sometimes making a rattling noise for a moment on start, like this morning. I also had a problem when I ...
Erhannis's user avatar
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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, ...
nwsteg's user avatar
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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 ...
Camion's user avatar
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1 answer
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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 ...
Frido's user avatar
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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 ...
Simon's user avatar
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1 answer
351 views

Vacuum effect in ansys

May i define vacuum as a negative pressure in ansys? This boiler tested for vacuum of 1520mbar.
neuwton's user avatar
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3 answers
1k views

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 ...
Mac_79's user avatar
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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 ...
Jonathon Neville's user avatar
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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 ...
user2934303's user avatar
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2 answers
176 views

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....
Thagusta's user avatar
1 vote
0 answers
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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 ...
dirkvwijk's user avatar
3 votes
2 answers
141 views

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, ...
Marius Wanscher's user avatar
2 votes
1 answer
181 views

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 ...
Joy Karmoker's user avatar
2 votes
1 answer
2k views

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'...
benjarojas's user avatar
1 vote
1 answer
44 views

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) ...
Veldaeven's user avatar
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4 answers
134 views

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 ...
TiffanyButterfly's user avatar
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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 ...
adnan's user avatar
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0 answers
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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 ...
ort's user avatar
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-1 votes
2 answers
47 views

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 ...
Giffyguy's user avatar
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1 vote
2 answers
132 views

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 ...
Thomas Sheeleigh's user avatar
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1 answer
147 views

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 ...
user148298's user avatar
4 votes
1 answer
104 views

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 ...
mes's user avatar
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1 vote
2 answers
2k views

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 ...
jreillygreekngineer's user avatar
0 votes
0 answers
119 views

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 ...
John M.'s user avatar
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3 votes
2 answers
1k views

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 ...
user148298's user avatar
0 votes
1 answer
58 views

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 ...
Jonah Cooper's user avatar
-2 votes
2 answers
2k views

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 ...
Roosevelt's user avatar
0 votes
1 answer
695 views

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 ...
Tom's user avatar
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1 vote
2 answers
76 views

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 ...
KeizerHarm's user avatar
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1 answer
46 views

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? ...
securitydude5's user avatar
1 vote
0 answers
89 views

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).
user avatar
2 votes
0 answers
19 views

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 ...
Gino's user avatar
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0 answers
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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 ...
dlam0002's user avatar
1 vote
0 answers
121 views

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 ...
SimpleJack's user avatar
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0 answers
26 views

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 ...
vasten's user avatar
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2 votes
0 answers
169 views

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 ...
Jagerber48's user avatar