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myv65 · 07-01-2002, 12:35 PM

Sirpent,

You're really asking a question on radiator performance since a block will alway yield a higher convection coefficient with higher flow. Rather than get into gory details here, I'll try to make certain I give this topic its proper due in my next article at AMDMB. Actually, I've got a short one on fluids due to go up very soon, but that's already finished on my end. The next one I'm working on is radiators and blocks and will hopefully address a lot of the questions posed here and elsewhere.

Les,

1.7 ft/s is actually a very low flow velocity. Is this the "average" velocity in your block? Most of the pumps we use will crap out with peak velocity in our system around 10 fps or less. If we keep velocity in our tubing and radiator relatively low, with a spike entering the block we'll generally be close to "optimum" performance for a given setup.

gmat,

A few months back a guy wrote me from Europe seeking input on a pump-less water cooling system. His intent was to cool water to ~4°C and allow natural flow to develop based on the fluid losing density via heating in the block. I was skeptical, but upon running the numbers figured he could cool his chip with ~1 gph and a 20°C delta-T in his block. If that's enough density variation to generate 1 gph, he may be onto something. It is definitely not an over-clocker's solution, but can't be beat for quiet operation. I did not inquire about his source for getting 4°C water, but would hazard a guess that he'd use a TEC with large passive heat sink on the hot side.

Unregistered (BillA

),

I owe you an apology. Based purely on second-hand comments, I took a couple of shots at some of your work. Not sayin' the comments won't be warranted, LOL, but I should say nothing without being certain of the true content. I have no excuse other than a natural ability to stick my foot in my mouth occasionally. I've read some of your stuff and found it to be of much higher caliber than most of what's available out here. Indeed, I'd like to discuss your radiator article in relation to my own prior to completing my work.

In the future, I'll try to get all the facts straight from the source and discuss one-on-one rather than going off half-cocked.

07-01-2002, 12:35 PM	#85
myv65 Cooling Savant Join Date: May 2002 Location: home Posts: 365	Sirpent, You're really asking a question on radiator performance since a block will alway yield a higher convection coefficient with higher flow. Rather than get into gory details here, I'll try to make certain I give this topic its proper due in my next article at AMDMB. Actually, I've got a short one on fluids due to go up very soon, but that's already finished on my end. The next one I'm working on is radiators and blocks and will hopefully address a lot of the questions posed here and elsewhere. Les, 1.7 ft/s is actually a very low flow velocity. Is this the "average" velocity in your block? Most of the pumps we use will crap out with peak velocity in our system around 10 fps or less. If we keep velocity in our tubing and radiator relatively low, with a spike entering the block we'll generally be close to "optimum" performance for a given setup. gmat, A few months back a guy wrote me from Europe seeking input on a pump-less water cooling system. His intent was to cool water to ~4°C and allow natural flow to develop based on the fluid losing density via heating in the block. I was skeptical, but upon running the numbers figured he could cool his chip with ~1 gph and a 20°C delta-T in his block. If that's enough density variation to generate 1 gph, he may be onto something. It is definitely not an over-clocker's solution, but can't be beat for quiet operation. I did not inquire about his source for getting 4°C water, but would hazard a guess that he'd use a TEC with large passive heat sink on the hot side. Unregistered (BillA ), I owe you an apology. Based purely on second-hand comments, I took a couple of shots at some of your work. Not sayin' the comments won't be warranted, LOL, but I should say nothing without being certain of the true content. I have no excuse other than a natural ability to stick my foot in my mouth occasionally. I've read some of your stuff and found it to be of much higher caliber than most of what's available out here. Indeed, I'd like to discuss your radiator article in relation to my own prior to completing my work. In the future, I'll try to get all the facts straight from the source and discuss one-on-one rather than going off half-cocked.