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Custom 62mm TEC Water block - Page 23  

post #221 of 680
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post #222 of 680
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YOU CAN NOT compare this pic with any others
im doing a control now for it....
AL things considering i think these number are really good .. we'll have to wait for the next one to confirm that though










Edited by Ultrasonic2 (muffy) - 7/30/09 at 2:43am
post #223 of 680
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post #224 of 680
soooo for the others(its probably basically me) here who dont understand whats going on can we get a quick explanation you know like good bad whats each pic for each one is a flow simulation the colors mean heat and etc just kinda wanna figure this out
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post #225 of 680
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Explained here

what good and what bad is a complicated answer but im probably going to go wth this design ish. but i'll put the cut outs across the whole block


post #226 of 680
just read the entire thread *head hurts* WOW! amazing work! if you ever go into production of a good one, i might be interested!

keep up the good work!
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post #227 of 680
thanks ultra cant believe i missed that... looking grat though cant wait to see you make one of these hopefully by the time i get back to the states youll have a good setup up and going and ill be able to get a new block from you then i can have a stinger adn an ultra block =D
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post #228 of 680
results are looking very interesting, awesome

EDIT:
i just remembered the Stinger internals... may be of interest to you.

Edited by ChielScape - 7/30/09 at 8:14am
post #229 of 680
Quote:
Originally Posted by ChielScape View Post
results are looking very interesting, awesome

EDIT:
i just remembered the Stinger internals... may be of interest to you.
This inspired me to find more pictures of waterblock internals. Ran across this thread which is just amazing.

EDIT: Link replaced with more local version:

Quote:
Originally Posted by ira-k View Post

Edited by Scarlet Infidel - 7/30/09 at 11:19am
post #230 of 680
Very interesting. You see how the more turbulent areas correspond to a large increase in the heat flux in the design with the rippled channels? Why not make all the channels have these cut outs to increase the heat flux further, afterall, the ultimate purpose of the waterblock is to remove as much heat as possible from whatever you are cooling!

Just to let some readers know the theory behind this, it is all to do with what is known as the heat transfer coefficient.

Now, the heat transfer coefficient basically tells you how much heat is transferred per degree difference in temperature and available surface area, and has the units Watts/m^2 Kelvin.

Turbulence corresponds to an increase in the Reynolds number, and convection data for a forced convection situation can always be expressed as Nu=k*(Re^n)*(Pr^m) where Nu is the Nusselt number, Re the reynolds number, Pr the Prandtl number, and k n and m are constants.

With Laminar flow over the fins, a near static surface boundary layer is formed which results from lower Reynolds numbers. This lowers the Nusselt number, which is directly proportional to the heat transfer coefficient.

So all in all, turbulence, whilst it can reduce flow rate by increasing restrictiveness, if you can find a good balance between the turbulence and flow rate you will be able to get the best optimised block.

These cut outs appear to do 2 useful things for the performance of the block:

1) Increase channel surface area.

2) Increase fluid turbulence, and thus increasing heat flux.

But the compromise here is with reduced fluid flow rate.

Ultra, I suggest you begin experimenting with these cutouts, and systematically recording the number of cutouts, and the heat flux through the block. So you do something like set up an Excel spreadsheet, and enter in the number of cutouts in the design, and the overall heat flux (Or maybe just the max heat flux and you can assign a correction factor to it based on what percentage of the channels the high heat flux covers). Now you should plot the number of cutouts against the heat flux.

Now as the turbulence inscreases in the block and the mass flow begins to fall, you should notice a parabolic relationship which rises as turbulence increases but will fall once the the mass flow becomes too low. This will give you a maximum value which will indicate the ideal number of cutouts!

You dont even have to do that many simulations! Just add in say 6 cut outs every time then records your results, then add in a parabolic trendline in excel which will give you a good idea of how many of these cut outs you need!

I've used a similar technique when using FEA which helped save a huge ammount of time with design. I hope that this technique could help you!

alk
Edited by alk - 7/30/09 at 9:49am
    
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