Graphene heat pipe

They are not all that far off the ideal behaviour though. An order of magnitude better conductivity than a metal like copper or aluminium.

A vapour phase transition can move a lot of energy from the hot end to the cool end and then wick back along the walls to repeat the cycle.

Graphene heat pipe only real advantage is lighter weight and "coolness". (as in novelty value - horrendously expensive for what it is)

There is a tendency for graphene with everything at the moment.

Its other advantage is fragility (from the makers' perspective). It don't dent or bend so good.

Cheers

Phil Hobbs

Well, you at least need some arithmetic to estimate how hot the chip will get. You need to buy the right heat sink, and maybe fans.

There is an interesting quantitative analogy between thermals and electricals:

ELECTRICAL THERMAL

which is accurate to about 10%. So you can use Spice to analyze either static or transient thermal systems.

Not according to my use of the word.

I like to bench test things as a sanity check.

There are material fads in academia.

They used to corrode internally and fail. Are they better now?

They're used in the heatsinks of most of the servers in the world AFAIK. I've had six of them running in Supermicro boxes for a decade or so; one running 24/7.

Copper and distilled water is a generally benign combination, and of course you can use Prestone if you want oxidation inhibitor. Aluminum may not be so good.

Cheers

Phil Hobbs

Sanity-checking the lunatic fringe. ;) Tinfoil hats recommended.

Cheers

Phil Hobbs

Fun, and potentially useful. Mind if I put it in my revised thermal chapter?

So you can use Spice to analyze either

At least in situations where diffusion isn't important. When diffusion matters, you get an extra 45 degrees' phase shift every time your amplitude goes down by 1/e, without limit. Using PID control in a diffusion-dominated problem is not a growth strategy.

Cheers

Phil Hobbs

No, please do. I think it's about right. Of course, thermal systems are seldom so polite as to be made of lumped elements.

I haven't had time to review your draft. I've been crushed, and fatigued from what was probably The Virus. I'll try.

A string of R-Cs sorta works some times. Or an LTL.

In lieu of buying and learning serious software, I bench test. Do some machining and get away from mice and screens for a while.

Thanks. I'll check before I do, obviously.

Sure, no worries. Hope you feel better soon. The book will be in production for some months, and I can fix mistakes up till the fourth printing, so Christmas isn't really a drop-dead date.

Yup. Uber-fancy simulation software is a full-time job to keep up with. That's mostly what keeps me away from Comsol or LightTrans or those sorts of things.

Cheers

Phil Hobbs