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Bayes
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Space Shuttle Tile Material

05/24/2016 9:39 AM

This is pretty amazing....really shows how incredibly dissipative the Space Shuttle Thermal Tile material was.

https://www.youtube.com/watch?v=FCbm6vjPPUw
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wrenchtwirler
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#1

Re: Space Shuttle Tile Material

05/24/2016 9:49 AM

That's awesome.
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#2

Re: Space Shuttle Tile Material

05/24/2016 1:08 PM

shhhhhhhhhhh. it don't fly no more
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jack of all trades
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#3
In reply to #2

Re: Space Shuttle Tile Material

05/24/2016 3:56 PM

Neither does the link unfortunately.

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Brave Sir Robin
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#4
In reply to #3

Re: Space Shuttle Tile Material

05/24/2016 6:24 PM

The killjoys . . .

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NeilA
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#5

Re: Space Shuttle Tile Material

05/25/2016 12:11 AM

Seems that the term "dissipative" is inappropriate? Is radiating the surface energy dissipation?

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dkwarner
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#7
In reply to #5

Re: Space Shuttle Tile Material

05/25/2016 10:47 AM

GA. Why the first question mark?

The key is neither dissipation nor radiation. It is extremely low thermal conductivity combined with the ability to remain structurally sound at very high temperatures.

It took hours for the heat to penetrate inside those blocks, and it will take only a little less time for it to come back out.

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#8
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Re: Space Shuttle Tile Material

05/25/2016 11:45 AM

Conductivity has to be low but diffusibility is the determinating parameter.
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dkwarner
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#9
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Re: Space Shuttle Tile Material

05/25/2016 12:17 PM

Please provide a quantitative definition of "diffusibility". Is that something different from 3-dimensional heat conduction?

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#10
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Re: Space Shuttle Tile Material

05/25/2016 2:48 PM

Conductivity (be it mono or 2 or 3 dimensional depending on the nature of considered body if it is isotropic it will be the same in all directions) is only the parameter which determine the temperature difference in case of a flux or the flux in case of a temperature difference. It does not consider the capacity to store heat of the considered material.

Difusibility is the ratio = conductivity /( specific mass*specific heat) it is a measure for the "velocity" of the heat mouvement in a body. For steady state heating difusibility is not interesting it but in transients it is the parameter which determines how the temperature field changes versus time. When the hand touches a heated body without harm it means that the heat content in the body cannot mouve to the skin: it cannot difuze to the skin.The skin having a much more lower temperature will take from the surface a heat amount which will be transported by the fluids but due to low mouvement of heat the body content will not be able to compensate fast enough the loss so that temperature stays low.

A similar process takes place when people walk on coal.

If you look at the partial differential equations for a non steady state heat transfer you will find an even more precise and complete explanation than mine.
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dkwarner
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#11
In reply to #10

Re: Space Shuttle Tile Material

05/25/2016 2:59 PM

Thanks! I missed that one somehow back when...

I was great in math, up through integral Calculus, but at differential, I hit a major stumbling block, and never recovered.

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#13
In reply to #11

Re: Space Shuttle Tile Material

05/26/2016 5:44 AM

You did not have the right teacher or professor. If you were good on one side there is no objective reason to fall in the other since they are intimely connected.
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#12
In reply to #10

Re: Space Shuttle Tile Material

05/25/2016 8:42 PM

Thanks, that makes sense. To an electrical engineer, it would be a circuit with a very large resistor (low temperature conductivity) and a large capacitor (large heat capacity) to give the familiar long RC time constant.

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Bayes
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#6

Re: Space Shuttle Tile Material

05/25/2016 6:57 AM

Here's a new working link. Sorry, I don't know why the other was taken down.

https://www.youtube.com/watch?v=Pp9Yax8UNoM
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