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post #1 of 8 (permalink) Old 05-15-2020, 10:35 PM - Thread Starter
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Restricted flow question

I'm thinking about doing this because I really like the idea and how it looks. However, will the way the water comes out of the reservoir into the T-Block restrict the flow alot or not?
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post #2 of 8 (permalink) Old 05-17-2020, 09:55 AM
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Typical Tee-branch fittings has about twice as much restriction as a sharp 90° elbow.

There are several equivelent length tables online like this one or this one.
and several calculators to get rough estimates on entire systems like this one.

Specific components like blocks and radiators have their own unique pressure drop profile. Manufacturers SHOULD provide them, but some don't.

Last edited by PM2843; 05-17-2020 at 10:01 AM.
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post #3 of 8 (permalink) Old 05-17-2020, 03:12 PM
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Quote: Originally Posted by PM2843 View Post
Typical Tee-branch fittings has about twice as much restriction as a sharp 90° elbow.

There are several equivelent length tables online like this one or this one.
and several calculators to get rough estimates on entire systems like this one.

Specific components like blocks and radiators have their own unique pressure drop profile. Manufacturers SHOULD provide them, but some don't.
I hear this a lot, but I've never seen test results. Do you have an article with measurements that proves this? I'd really like to know this.
If not I'll see if can test it with my spare loop.

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post #4 of 8 (permalink) Old 05-17-2020, 06:32 PM
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Quote: Originally Posted by broodro0ster View Post
I hear this a lot, but I've never seen test results. Do you have an article with measurements that proves this? I'd really like to know this.
If not I'll see if can test it with my spare loop.
From Sodiki and Adigio it looks like Roberson and Crowe in 1975 and Giles in 1977 did the original research or were the first to compile other sources of head loss through fittings. Good luck tracking down those papers though. All of it has been revised and refined in the last 45 years anyways and the tables today are taken as gospel. In practice, equivalent lengths are usually calculated at worst possible loss with an added safety factor unless other factors such as volume taken up or fitting mass are needed to be considered.

Testing fitting head loss should be doable if pressure drop or flow rate can be precisely measured using a pump with a known curve. But there are a ton of variables that could complicate matters.

Last edited by PM2843; 05-17-2020 at 06:41 PM.
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post #5 of 8 (permalink) Old 05-17-2020, 06:39 PM
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Quote: Originally Posted by broodro0ster View Post
I hear this a lot, but I've never seen test results. Do you have an article with measurements that proves this? I'd really like to know this.
If not I'll see if can test it with my spare loop.
I applaud you for asking the question in lieu of hard evidence, I would love to see what you come up with.

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post #6 of 8 (permalink) Old 05-17-2020, 06:56 PM
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Found a physical experiment that tested pressure loss in fittings. Check page 25 and 31 for elbow and tee data. Results consistent with previous data of a branch-tee having twice the loss of an elbow. Interestingly, it looks like it is the some of the first research into losses of reducing or expanding elbows and concentric reducers for 6 to 10 inch steel pipe.

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post #7 of 8 (permalink) Old 05-18-2020, 10:07 AM
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http://martinsliquidlab.petrastech.c...Estimator.html
Martins lab has a tee in the estimator. Picture going down on a slide with a sudden 90 degree face plant turn. ^^

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post #8 of 8 (permalink) Old 05-18-2020, 10:20 AM
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Restricted flow question

Quote: Originally Posted by broodro0ster View Post
I hear this a lot, but I've never seen test results. Do you have an article with measurements that proves this? I'd really like to know this.
If not I'll see if can test it with my spare loop.

Buy some Aquacomputer pressure sensors and you can test it yourself.

Without a flow meter you’ll never know what part affects the flow either

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