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 JetEye |
Category: General Posted: 2008-02-06
Status: Open / JetEye
$ 10 has been prepaid
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Location: Littleton, Colorado
0 accepts/ 1 questions
Accept Rate: 0%
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Dear Sirs,
I am working on a hydro electric home project. I have a couple of questions. 1. How fast does air rise in water? 2. I understand that in a gear reduction, "The torque produced by the output is inversely proportional to the amount of reduction of the gear box". Is this true for an increase in rpm's, as opposed to decrease? Can you give me any formulas that express this increase, or decrease in torque? 3. I'm looking for liquids that are easily obtainable, and cheap that have a higher density than water... Any suggestions? (And/or charts)?If I use antifreeze in water, how does that affect it's density? Any information you can give, will be a great help!
Jesse |
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chepund |
Posted: 2008-02-09 08:03:01 |
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Location: Kiev, n/a
Answers Given: 26
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Hi, Jesse!
1. Air rises in water with acceleration. This acceleration equals the acceleration of gravity(9.8 m/sec^2). Thus after 1 second the speed of the air will be 9.8 m/sec, after 2 seconds 19.6 m/sec and so on.
2. If I understood your question correctly…
"Steam engines and electric motors tend to produce maximum torque close to zero rpm, with the torque diminishing as rotational speed rises (due to increasing friction and other constraints). Therefore, these types of engines usually have quite different types of drivetrains from internal combustion engines."
http://en.wikipedia.org/wiki/Torque
3. Density of antifreeze is 1065—1085 gram/litre i.e. it has density slightly higher than water. If you need liquid with higher density than antifreeze you can use salt solution in water. Saturated salution of salt in water has density of 1200 gram/litre. But such a solution is corrosive for iron parts of mechanisms. Adding some concentrated antifreeze to the salt solution may make it less corrosive. If you need liquid with even higher density you may take solution of natrium bromide in water. 45% solution of natrium bromide in water has density of 1490 gram/litre. It is less corrosive than salt solution but it is not very easily obtainable and is not very cheap. Natrium bromide is used in photography(not digital one). Calcium bromide gives even more dense solutions in water(1850 gram/litre) but unfortunately it is not easily obtainable. There are organic liquids with density higher than water but they are mostly toxic and not cheap and easily obtainable.
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