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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Hi, if you have two different metals copper and steel, and you have the same airflow of air at the same temperature, will the one with the lowest specific heat be at a higher temperature? Cheers
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
You haven't given us enough information. Are the metal parts connected to heat sources or sinks, other than the air flowing around them? If not, then they will both eventually be at the same temperature as the air. That's the meaning of temperature.
Are you interested in non-equilibrium temperatures? Then it would help to know if the metal parts are initially hotter or colder than the air.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
I'm trying to work out if maybe the hot side is one metal the cold side, say they are both connected to a heat sink, can range from different values, and the top side is got air flowing over them.,they both start at the same temperature. Cheers
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Draw a diagram of what's connected to what, what's heating what, where things are being cooled. If it was an electrical problem we'd draw a schematic. Draw a thermal schematic.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
I'm still working on it, but this is what I've got. Heat source =4.2kj Cold source =0-8.4kj Voltage =20 degrees tesistance unsure sample one =0.4kj specific heat Sample two =0.8kj specific heat
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Specific heat will have no bearing on the steady-state result. Thermal conductivity will. If you are interested in transient results then both specific heat and thermal conductivity will come into play.
Seriously you need to formulate your questions better if you want them answered - its actually harder to work out what your question is than to work out the answer. Do you not have Windows Paint? Really?
Something you might enjoy, and I highly recommend you download and learn to use, is FEMM 4.3 (http://www.femm.info/wiki/HomePage). Its a 2.5D finite element simulator for magnetic, electrostatic and heat problems.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
I downloaded femm, just trying to learn how to use it. Is it best to have copper heatsinks or would steel be to much worse, I would think that water has low thermal conductive properties that would be the bottle neck?
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Two materials with different specific heat and air flow
