ribbon cable current (2023 Update)

You can also get flat plate ones that will do it in 2D. Maybe these will work:

It says that the return mechanism is grooves rather than anything very

Cheers

Phil Hobbs

Nice. We could mill a wide slot in our block and put that in.

The active part of the e/o modulator is so long and skinny that we really only worry about temp gradients in the long axis.

Those MHP parts seem to be obsolete.

verwarde terrorist dreigend met toetsenbord snipped-for-privacy@torenspits.com wrote in news:sfirta$nr4$ snipped-for-privacy@dont-email.me:

I have an LED flashlight that is so bright that it heats surfaces. I have captured bugs under the nose of it between the glass window and roasted them dry. Those damned stink bugs that get inside your windows even though there are no holes anywhere.

So just use a high powered LED meant for illumination as your heat source. No need for a laser diode.

Well, the temperature gradient is linear, so I'd guess that heat flow is as well, not that it really matters:

Agree.

There are some pretty good technical papers on just how heat pipes work. Not that I recall the cites, so there is always Wiki.

Right in the range for water in copper, which is by far the most widely used combination.

Be careful of mismatched temperature coefficients of copper and the aluminum body of the oven wall or modulator wall. The thermal epoxy used cannot be rigid.

Can you glue some heat pipes to the modulator body?

And some others to the oven enclosure wall, with an air gap between?

Joe Gwinn

Joe Gwinn snipped-for-privacy@comcast.net wrote in news: snipped-for-privacy@4ax.com:

Use thermally and electrically conductive silver filled epoxy. The same stuff they use to attach IC chips. I think they have more elastic formulations.

Hmm, interesting, I guess if they pump all of the air out before filling with de-gassed water then they ought to work at low temperatures. I imagine that if one filled a heat pipe with air and water at atmospheric pressure (without evacuating it), it would still very work well with the source side above 100C, but miserably when much below that temperature. Would you agree?

The kinetics slow way down at low temperatures, though, so eventually conduction through the metal exceeds the vapour transport.

For any given amount of fluid, there will be a temperature above which it won't condense, which will limit the maximum heat sink temperature. And if the liquid all evaporates before it gets to the hot end, it won't work as well. I don't know what happens above the critical point, where vapour and liquid become indistinguishable.

The low temperature ones mostly use acetone for a working fluid, AFAICT.

Cheers

Phil Hobbs

Heat pipes are often pressed into slots on a plate. That makes a much better thermal connection than grease or epoxy. The silver or even diamond filled epoxies are still mediocre heat conductors.

The best gap filler is to have no gap.

Chris Jones snipped-for-privacy@spam.yahoo.com> wrote in news:k0sTI.2783042$ snipped-for-privacy@fx03.ams:

Nope. They rely on vapor, so low boiling point, high latent heat liquids are used. I doubt that there any water filled jobs out there.

snipped-for-privacy@highlandsniptechnology.com wrote in news: snipped-for-privacy@4ax.com:

happened

thermal

Idiot. One STILL makes it a press fit or interference fit, however, one ALSO makes sure that the epoxy IS there to fill any voids, which you have barked about for years. Make up your mind.

Even the IC chip makers use it, so their intimate contact must not be intimaste enough for them either.

The epoxies I mention are not some cheap chinese PC processor crap. They are mil spec pro level, Johnny. You know... what the entire industry I guess except for you uses.

Water.

I just do the math.

torsdag den 19. august 2021 kl. 17.17.41 UTC+2 skrev snipped-for-privacy@decadence.org:

most of them are water.

nothing has higher latent heat of vaporization than water and the boiling point is just a matter of lowering the pressure at 5kPa it is ~30'C

Do you think the latent heat of vaporization is the same at 30°C as it is at 100°C?

close enough,

snipped-for-privacy@highlandsniptechnology.com wrote in news: snipped-for-privacy@4ax.com:

Shitty medium for the task. Depends on the operational temp window at both ends though one supposes.

If one has a pumped moving media loop system, not heat pipes, then water is the perfect medium.

Then you can simply buy an off the shelf cpu "water" system. If you need to go cold, then a dielectric fluid like "FC-40 Fluorinert" is good because it is non-conductive and carries heat well. You could make a sealed enclosure for the circuit to sit in and flood the entire thing with it and then all you need do is manage the fluid temperature which you can now take down to about -140C. You'd need one hell of a cascaded cooler mechanism to chill it that low though.

Water is great stuff. Great thermals, non-toxic, cheap, tastes good.

I wonder if you could ski on frozen methane.

IIRC most substances shrink as they freeze. Skating relies on the ice melting under the blade due to compression, so a hypothetical J Jovial Larkin probably couldn't skate very well on methane.

I sort of doubt that skis exert enough pressure to do that, so he might be able to ski.

Cheers

Phil Hobbs

afaiu that is no longer how it is believe to work