| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
06 Jun 2005 12:11:18 AM |
| Object: |
A Question About Friction... |
Greetings,
This is my first post... ever,
I have a wee question regarding friction after a thought that occurred
to me the other day...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful? That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
Wil.
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| User: "CWatters" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 01:07:14 AM |
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<campbell.wil@gmail.com> wrote in message
news:1118034678.799930.223500@g14g2000cwa.googlegroups.com...
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful?
Christmas cracker.
Friction welding.
http://www.matter.org.uk/steelmatter/manufacturing/welding/friction.html
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| User: "Uncle Al" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 11:55:11 AM |
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wrote:
Greetings,
This is my first post... ever,
Like, love, lust, laundry.
I have a wee question regarding friction after a thought that occurred
to me the other day...
Uh oh...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
Regenerative braking, clutches, viscosity vs. pressure continuous
transmissions, electrorheology. As for not wishing to dissipate
frictional heating... Dragsters spinning their rear wheels to get the
rubber compound hot and sticky just before a run. Be careful when you
generalize.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful?
Rub two Boy Scouts together to start a camp fire without matches.
That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
When is heat from mechanical work obtained more efficiently than heat
directly generated from the original lower entropy input energy?
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "Sam Wormley" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 08:20:15 AM |
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wrote:
Greetings,
This is my first post... ever,
I have a wee question regarding friction after a thought that occurred
to me the other day...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful? That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
Wil.
Rub you hands together in the cold.
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| User: "" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 11:23:04 AM |
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wrote:
Greetings,
This is my first post... ever,
I have a wee question regarding friction after a thought that occurred
to me the other day...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful? That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
Wil.
Race drivers on a pace lap wiggling their cars back and forth to
generate friction to warm up the tires?
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| User: "yt56erd" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 10:58:23 AM |
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wrote:
Greetings,
This is my first post... ever,
I have a wee question regarding friction after a thought that occurred
to me the other day...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful? That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
Wil.
almost a decent post, shame most replies will be tongue in cheek.
however this is usenet, you get what you pay for :)
it is a good idea. can you think of any ways you can recycle the heat
into useable energy?
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| User: "Morituri-|-Max" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 11:34:22 AM |
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"yt56erd" <yt56erd@gmail.com> wrote in message
news:1118073503.800396.85620@g47g2000cwa.googlegroups.com...
almost a decent post, shame most replies will be tongue in cheek.
however this is usenet, you get what you pay for :)
it is a good idea. can you think of any ways you can recycle the heat
into useable energy?
Hmmm, tongue in cheek, ah.. since waste heat can't be recycled into useable
energy, it must stay around permanently.. so we can use it as an infinite
duration space heater.
8 )
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| User: "Puppet_Sock" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 01:02:03 PM |
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wrote:
[snip]
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful?
Yes. In meat packing factories, one of the processes involved
is smoking the meat. Bacon, sausages, etc., all require smoke.
The smoke is produced by shoving a board against a gear. This
allows a controllable heat to be produced, turning the board
into smoke at a controllable rate.
Socks
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| User: "Timo Nieminen" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 12:15:37 AM |
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On Mon, 5 Jun 2005 wrote:
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful?
Bow-drill firelighter. Or any of a variety of friction-generated heat
based firelighters.
How do you light a match?
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "Edward Green" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 04:45:04 PM |
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Timo Nieminen wrote:
On Mon, 5 Jun 2005 wrote:
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful?
Bow-drill firelighter. Or any of a variety of friction-generated heat
based firelighters.
How do you light a match?
Huh. Of course, there is friction, but it never occured to me that was
the dominant effect. Most matches need a special striker, so I assumed
mechanical disturbance initiated a reaction with the help of a
catalyst. Alright... I guess that still involves "friction". And then
the old non-"safety" matches were much less particular about their
source of friction.
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| User: "Geoff Taylor" |
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| Title: Re: A Question About Friction... |
06 Jun 2005 11:28:25 AM |
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There are many systems that involve apparent inconsistencies based on
engineering expediency.
Using friction to change kinetic energy into heat is a useful technique to
light a match.
Using friction to convert the knetic energy of a water turbine to heat to
boil water to run a steam turbine seems stupid.
<campbell.wil@gmail.com> wrote in message
news:1118034678.799930.223500@g14g2000cwa.googlegroups.com...
Greetings,
This is my first post... ever,
I have a wee question regarding friction after a thought that occurred
to me the other day...
Most mechanical systems are designed with a view to minimising
friction, and those that aren't (such as brakes etc...) are often built
to minimise and dissapate the heat generated by the friction involved.
My question is whether anyone knows of a mechanism or system that
deliberately generates heat through friction so that that heat can be
made useful? That or a system that recovers heat from friction in a
system and uses it to do useful work. If anyone knows of even a
distantly related process or mechanism i would love to hear about, and
any comments on the theoretical feasibility of such a system would also
be appreciated,
Thanking you in advance,
Wil.
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