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Questions tagged [thermal-conduction]

93 questions
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Are there any materials known to be sound-insulating but thermally-conductive?

Are there any materials known to be sound-insulating as well as thermally-conductive? Cost is not an overriding concern, but preferably costing "reasonable amounts" and much less than national defense spending levels. This is a thought experiment…
Jimmy Hoffa
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Does good electrical conductivity imply good thermal conductivity?

Typically materials which are good conductor of electricity are also good conductor of heat, and vice versa. Are there notable exceptions?
zxc
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Why does the author assume the temperature to remain constant, in this case, along the axial direction?

This is in regards to steady heat conduction taking place in a pipe. Within the pipe a hot fluid flows and heat transfer first takes place via convection to the pipe and then via conduction within the pipe and then finally via convection from the…
Harshit Rajput
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Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)

I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production apparatus very simple and cheap. The kind of pump used…
Michael Turner
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Filling gaps in heatsink design to improve thermal conductance?

I am currently pondering modifying my laptop's heatsink and am curious whether I stand to gain any benefit at all. The CPU and GPU (similar heatsink design) reach high temperatures (90°C +) under load and the exhaust air is warm, but far from…
Betaminos
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Use two passive CPU coolers on one single CPU?

I aim on building a silent, completely passively cooled PC, with no moving parts at all (I am aware that it is cheaper to go for an inaudible computer instead, using low speed fans. This is not the point.). I came up with the idea to install not…
Benjoyo
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Winding a wire heating element after a few uses

I bought recently 10 meters of Kanthal A1 AWG18 wire, which is a type of heating element (FeCrAl alloy). I intend to make a coil out of it, but it's no use doing that right now, I need more of it for my project (electric furnace), have ordered more…
camurgo
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Relationship between thermal conductivity and reaching the steady temperature?

The diagram is for three materials with different thermal conductivities. I think number 1 is the material with higher thermal conductivity because it transfers the heat faster so it gets to the steady temperature sooner than the other two. Am I…
Mo Samani
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Trapping sun heat the most - greenhouse

Greenhouse have recently caught my attention lately, which yesterday I posted in Why greenhouse's inside temperature never been infinitely hot? From what I understand recently, greenhouse gases traps the sun heat (infrared radiation) on earth, by…
gijoe
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Powder form of material with high thermal transfer

The Engineering Toolbox presents a chart of "common" materials and their thermal conductivity coefficients. I'd read or learned some time ago that diamond was superior in this respect. The chart shows diamond at 1000 W/m K compared to the next…
fred_dot_u
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Rapidly cool a flue gas without water circulation

I am a newbie at this!! For an experiment, I have a diesel generator that releases hot flue gases at 150-160 Degree Celcius. I want the output gas to be at less than 75 degrees for a duration of ~ 1 hour without 'circulating' water. I'd like to do…
touchaddict
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Heat Loss in Typical House

I recently looked up the recommended insulation value for my area (7) and was surprised how much lower the wall insulation value was shown to be. As you can see it is almost a third of the recommended attic value. I am fairly certain that these…
Jonathon
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Convective heat transfer coefficient in finite difference method boundary conditions

Suppose there is a cubic material with an internal heat source ($\Delta q / \Delta t =$ Constant), and is immersed in a sufficiently large amount of water. Now I would like to use finite difference method to simulate the steady state temperature…
Xiangxi Meng
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How can I determine the thermal conductivity of an open container?

I want to know the heat conduction coefficient of a cup in order to investigate why tea cools at different rates in different containers. I know the cup is mostly plastic and paper. How do I determine the heat conduction? Do I use a known value?
Inam Ullah
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How can one make graphene cables?

You might see in this short, 2-minute video that billionaire Manoj Bhargava talks about creating cables from graphene to conduct heat from the underground sections of the earth to the surface. But as per the properties of graphene, it is only a good…
rahulgarg12342
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