Idle block ideas

UNDERBYTE · 05-19-2003, 10:23 PM

I am more of an air guy than water but I had some Idle thoughts on fluid flow/block design some & basic air stuff may be applicable maybe not.

It would seem to me that you would want to accelerate flow at the hottest point over the die- You could do this by contracting the block channels, say some thing like 2 to 1 or 3to 1. This in effect would give you 5-10 higher speed nozz3ls right at the die. probable geometry might be uniform channel walls with decreasing height and cover would have to dovetail into the channel to make up the difference. Or have "V" type Channel walls although they might be harder to construct and take more space.

Also I do not see much about augmentors or ejectors. An Augmentor can add 25-40% to your flow. Most Home well pumps are usually fitted with an ejector, industrial smoke stacks often have ejectors which add sometimes 45% to the flow. Common in jet engines and as simple as a purfume bottle with aspirating bulb. You have a primary flow you just need a way to induce the secondary flow. There are litterally thousands of examples out there.

I was also curious as to whether anybody out there has tried running compressed air through a microchannel block

I have read some papers on it and has some potential. Could be quiet run the line from the compressor from the garage or basement. Maybe get a little of that abdiatic action.

I may be way off base here but thought it might be interesting to some.

CheeseBall · 05-19-2003, 10:44 PM

I thought about compressed air also. But just running through a heatsink. The air will be abit warmer (dunno how much, I could take a reading I guess), but The CFM will be great. I guess I kinda forgot about it because I was never going to try it. I s'pose it would have to be in an inclosed block because if noice, dust, moisture, and the power of the air.

Some one smart post, cause I dunno much about it.

GTA · 05-20-2003, 07:46 AM

Quick reply before I shoot back off to work:

I'll search the web later, but could you describe the augmenters and ejectors you mention in a bit more detail?

UNDERBYTE · 05-20-2003, 10:15 AM

The simplest form of an ejector is a perfume bottle. when you squeeze the bulb a high velocity jet passes over a tube. The higher velocity is of lower pressure. This is what induces or sucks the liquid perfume out of the bottle because of it higher pressure. One hallmark of an ejector is it's Mixing characteristic. It also increases total mass flow

The Air force Nozzle uses a rotating head that has a high speed flow that impinges on the walls of a contracting orifice.

On a project for a hairdryer company I used something like the Air force Nozzle. On my initial tests I took a Hairdryer and a Styrofoam cup with the bottom cut out. The exhausted air from the hairdryer striking the wall of the cup (which was a decreasing orifice) boosted flow velocity from about 650 ft. per min to 875 ft per min. not a good pressure application but a terrific free flow enhancement.

An ejector utilizes normaly wasted energy and converts it to useful mass flow.

One of the earliest was industrial uses was a steam engine

It is used commonly in hydraulics and I see no reason it could not be applied to a water block or even a pump

bigben2k · 05-20-2003, 11:23 AM

Someone posted a link recently, about microbubbles in coolants, to improve the cooling, but the paper was clear: any air normally injected decreases performance.

Which makes sense: the resulting coolant would have a higher heat resistance.

Now if you were suggesting to use compressed air to locally improve the flow, in the form of an air activated, pressure booster water pump, I think it would be worth looking at, but I'm afraid that it would otherwise be a waste of time.

I dunno, maybe I'm wrong. If you can make something of it, let us know!

As for the enlarger/reducer, keep in mind that water is a mostly incompressible fluid, so the flow characteristics will be different. Otherwise, you're talking about a nozzle, and we've covered that a few times (run a search here).

logosmani · 05-20-2003, 11:50 AM

think he was more thinking about just passing air (alone) at high volume thru a waterblock, not having involvement with water

is what your talking about with the ejector similar to how an aircrafts wing operates to create lift or am i way off mark here?

UNDERBYTE · 05-20-2003, 01:16 PM

No, Water as I said it is commonly used in household well pumps does not need air to work. that is just one of the forms it is used in. In fact it is based on Bernoulli's Theorem. In the classical example a contricting water pipe is used with other pipes leading off vertically and filled with water. As the pipe consticts with water flowing through it, the pipes on the down stream side have lower fluid levels indicating lower pressure.

Probably most ejectors in use are most likely used with liquids of some kind I just happen to be more into airflow and am not aware of all the forms it take.

Ejectors are seperate from nozzles but can be used with them.

If you want to know about nozzle's check out DeLaval
nozzle, Might be good to machine into your blocks***JUST NEED A LITTLE SUPERSONIC ACTION

http://lifesci3.arc.nasa.gov/SpaceSe...et/rocket.html

Air, No I was just thinking air alone in blocks as a seperate matter

05-19-2003, 10:23 PM	#1
UNDERBYTE Cooling Neophyte Join Date: Oct 2002 Location: CENTRX Posts: 75	Idle block ideas I am more of an air guy than water but I had some Idle thoughts on fluid flow/block design some & basic air stuff may be applicable maybe not. It would seem to me that you would want to accelerate flow at the hottest point over the die- You could do this by contracting the block channels, say some thing like 2 to 1 or 3to 1. This in effect would give you 5-10 higher speed nozz3ls right at the die. probable geometry might be uniform channel walls with decreasing height and cover would have to dovetail into the channel to make up the difference. Or have "V" type Channel walls although they might be harder to construct and take more space. Also I do not see much about augmentors or ejectors. An Augmentor can add 25-40% to your flow. Most Home well pumps are usually fitted with an ejector, industrial smoke stacks often have ejectors which add sometimes 45% to the flow. Common in jet engines and as simple as a purfume bottle with aspirating bulb. You have a primary flow you just need a way to induce the secondary flow. There are litterally thousands of examples out there. I was also curious as to whether anybody out there has tried running compressed air through a microchannel block I have read some papers on it and has some potential. Could be quiet run the line from the compressor from the garage or basement. Maybe get a little of that abdiatic action. I may be way off base here but thought it might be interesting to some.

05-20-2003, 11:23 AM	#5
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Someone posted a link recently, about microbubbles in coolants, to improve the cooling, but the paper was clear: any air normally injected decreases performance. Which makes sense: the resulting coolant would have a higher heat resistance. Now if you were suggesting to use compressed air to locally improve the flow, in the form of an air activated, pressure booster water pump, I think it would be worth looking at, but I'm afraid that it would otherwise be a waste of time. I dunno, maybe I'm wrong. If you can make something of it, let us know! As for the enlarger/reducer, keep in mind that water is a mostly incompressible fluid, so the flow characteristics will be different. Otherwise, you're talking about a nozzle, and we've covered that a few times (run a search here). __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-20-2003, 01:16 PM	#7
UNDERBYTE Cooling Neophyte Join Date: Oct 2002 Location: CENTRX Posts: 75	No, Water as I said it is commonly used in household well pumps does not need air to work. that is just one of the forms it is used in. In fact it is based on Bernoulli's Theorem. In the classical example a contricting water pipe is used with other pipes leading off vertically and filled with water. As the pipe consticts with water flowing through it, the pipes on the down stream side have lower fluid levels indicating lower pressure. Probably most ejectors in use are most likely used with liquids of some kind I just happen to be more into airflow and am not aware of all the forms it take. Ejectors are seperate from nozzles but can be used with them. If you want to know about nozzle's check out DeLaval nozzle, Might be good to machine into your blocks**JUST NEED A LITTLE SUPERSONIC ACTION http://lifesci3.arc.nasa.gov/SpaceSe...et/rocket.html Air, No I was just thinking air alone in blocks as a seperate matter Last edited by UNDERBYTE; 05-20-2003 at 02:33 PM.*

05-19-2003, 10:44 PM	#2
CheeseBall Cooling Savant Join Date: Jan 2003 Location: Colorado Posts: 176	I thought about compressed air also. But just running through a heatsink. The air will be abit warmer (dunno how much, I could take a reading I guess), but The CFM will be great. I guess I kinda forgot about it because I was never going to try it. I s'pose it would have to be in an inclosed block because if noice, dust, moisture, and the power of the air. Some one smart post, cause I dunno much about it.

05-20-2003, 07:46 AM	#3
GTA Cooling Savant Join Date: Mar 2003 Location: UK - Bristol Posts: 134	Quick reply before I shoot back off to work: I'll search the web later, but could you describe the augmenters and ejectors you mention in a bit more detail?

05-20-2003, 10:15 AM	#4
UNDERBYTE Cooling Neophyte Join Date: Oct 2002 Location: CENTRX Posts: 75	The simplest form of an ejector is a perfume bottle. when you squeeze the bulb a high velocity jet passes over a tube. The higher velocity is of lower pressure. This is what induces or sucks the liquid perfume out of the bottle because of it higher pressure. One hallmark of an ejector is it's Mixing characteristic. It also increases total mass flow The Air force Nozzle uses a rotating head that has a high speed flow that impinges on the walls of a contracting orifice. On a project for a hairdryer company I used something like the Air force Nozzle. On my initial tests I took a Hairdryer and a Styrofoam cup with the bottom cut out. The exhausted air from the hairdryer striking the wall of the cup (which was a decreasing orifice) boosted flow velocity from about 650 ft. per min to 875 ft per min. not a good pressure application but a terrific free flow enhancement. An ejector utilizes normaly wasted energy and converts it to useful mass flow. One of the earliest was industrial uses was a steam engine It is used commonly in hydraulics and I see no reason it could not be applied to a water block or even a pump

05-20-2003, 11:50 AM	#6
logosmani Cooling Neophyte Join Date: Apr 2003 Location: Scotland Posts: 47	think he was more thinking about just passing air (alone) at high volume thru a waterblock, not having involvement with water is what your talking about with the ejector similar to how an aircrafts wing operates to create lift or am i way off mark here?

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