Questions tagged [air]
47 questions
8
votes
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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3
votes
1 answer
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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- 5
2
votes
0 answers
Theory of rotationally symmetric air cushion vehicle
I am trying to develop a theory for this situation:
A small blown-up balloon is attached to the center of a compact disc; you let it float as the balloon discharges. Simplifying assumptions: rotational symmetry, cushion has constant thickness t,…
r4r4
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2
votes
1 answer
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
- 169
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2
votes
3 answers
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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1
vote
2 answers
Why carbon water filter can build air pressure inside (before installation)?
Today I got a new refrigerator carbon water filter (this). Before installing, out of curiosity, I dripped a bit tap water into the filter’s outlet to see if water could flow in and out. Obviously it did… Then, distracted by something else, I put the…
max sim
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1
vote
1 answer
I'd like to create a column of smoke that goes as high as possible. Is there a fan or configuration of fans that is best?
Budget ~$5k
Current setup:
2x 20k cfm water-based smoke machines facing each other 6' apart blowing across the top or bottom of a fan or set of fans. I was hoping there could be a way to get a vortex that rose in the sky using a series of fans. I've…
Flyin-high336
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1
vote
1 answer
Suitable pipe suggestion required
I've got a machine that sucks water. The inlet is half inch. I had been using braided pvc till now but it has started to breathe air which is causing problems with the machine. It also bends under stress or in hot weather. I'd like a half inch pipe…
DribbleNibble
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1
vote
2 answers
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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1
vote
1 answer
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
- 113
- 3
1
vote
1 answer
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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1
vote
0 answers
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…
Robert Frost
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1
vote
0 answers
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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1
vote
1 answer
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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1
vote
2 answers
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…
S s
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