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Questions tagged [air]

37 questions
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2 answers

How do suction cups work?

These are suction-mounting hooks. I want to visualize and understand how do they stick on walls. After these hooks stick on wall. Like we compressed them. How? Since gases are compressible up to a good finite limit. What makes it difficult for them…
Rider
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What's the longest lasting tubing in air?

What's the longest lasting tubing for use in low pressure air systems? I'm looking at building a greenhouse with double or triple layer ETFE panels and the tubing would be run through the metal pipe structure, so it would experience exposure to air…
CoryG
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Analyzing the term $\frac{1}{c_s^2}\frac{dP}{dz}$ for atmospheric phenomena?

Some background I am reading through a textbook on atmospheric fluid dynamics. The author is discussing something called the Boussinesq relations, and eventually the following expression arises: $$ \frac{1}{\theta}\frac{d\theta}{d…
nwsteg
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How to manufacture parts with complex air channels inside?

I am designing a part that requires multiple air channels with an intricate structure inside. I would like to know if there is any state of the art injection molding technique or other technology that will enable that solution. Amount of air…
Kevin Mamaqi
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What causes water to always drip from an electric furnace when its turned on?

I made an electric furnace as a university project. It can heat up air inside up to 1000 degrees Celsius. It's not fully sealed so some air can escape from small gaps. Not sure if this would cause a problem or not later on, but water always drips a…
Bramble
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Properties of air and gas mixture

While studying a heat exchanger, I have encountered a hydrogen rich fluid stream (enters at 90° Celsius and exits at 120° Celsius) which has composition given in the following form: Air Humidity/Fluid composition: 1% (2.5 bar abs)/Mass fraction of…
Avrana
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Optimized water droplet formation

What is the best way to "shatter" a water drop falling purely under gravity if the objective is to break it into as many droplets and as fine (smallest diameter) as possible? Should the surface be perpendicular to the direction of the falling drop?…
Francois Grobler
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What's the most efficient air compressor to reliably deliver up to 15 litres per second at 10 bar?

Suppose I wanted to continuously supply up to 15 litres of air per second, compressed to 10 bar - what would be the most efficient type of compressor, i.e. the type requiring the least energy input in order to get the job done, if we assume the…
samerivertwice
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Air Conditioner for an Acrobat Plane

What kind of Freon air conditioner would work upside down? Or somehow make it cut off and start working again when upright? I have a small cabin so it can be electrically driven. I know they have an air conditioner for fighter jets but, I need a…
Justintimeforfun
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Is this an isenthalpic process?

My professor told us that If we spray water in dry air the process is on an Isenthalpic line of the Mollier diagram. Is it always true? if yes, can you explain me why?
SimoBartz
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Will an empty spray can maintain a vacuum?

If I were to remove all the air from a canister of WD40 so that it was a vacuum inside, and reinforced the walls so that it won't collapse in from atmospheric pressure, what would happen when I pull the trigger? Will it now suck like a vacuum…
Satbir Kira
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Accurate method or instrument to measure density of shaving cream foam or whipped cream foam?

I am currently filling a "standard" stainless steel cup of known volume with foam and then I weigh it. Then I calculate density. This method is pretty messy and I have to be careful about how I fill the stainless steel cup so that larger air pockets…
agentboo
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Is it possible to create a compressed/freezed air energy storage solution that also purifies the air of pollutants?

Basically can engineers design a machine where , while we are freezing and compressing the air for energy storage, we can also purify it of pollutants?
vpattinc
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The physics behind the condensation in tents?

When you compare single wall tent to double wall tent usually you will hear short summary "double wall tent prevents condensation from building up". So in most fair comparison it should work like this -- I have imaginary single wall tent (i.e. tent…
greenoldman
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Is there an optical technology able to measure the temperature of dry air?

Optical IR sensors are able to measure the surface temperature of solids. But is there a range of the EM spectrum that can accomplish the same for measuring the temperature of nitrox (dry nitrogen, oxygen mixtures)? If so what are the constraints?
docscience
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