LFP Super Venturi! Easy to make step-by-step guide! - Page 2

BeanAnimal · 09/22/2008, 01:20 PM

For the nerds in the bunch that NEED numbers and geeky formulas... here is a start: We are working with what are called Herschel Venturi tubes. There are pages of math that can be done, but if you want a good overview of the physics and basic design mechanics and they way the influence the apparatus:

http://www.primaryflowsignal.com/PDF...uri-040601.PDF

EnderG60 · 09/22/2008, 01:39 PM

man those diagrams are amazingly hard to read.

I remember there being a simplified variation of the bernuli(sp?) equation that had the diameter ratio's and the pressure differential. I just forget what book it was in.

With that it shouldnt be to hard to get a basic idea of what size on what pressure pump would yeild X air draw.

slandis3 · 09/22/2008, 01:41 PM

What wall thickness acrylic are you useing?

Dkarc · 09/22/2008, 02:29 PM

Cant wait to see the video....I am working on a filtration system that needs a venturi on the output so I am very interested in this.

-Ryan

andrewfl · 09/22/2008, 02:41 PM

me to im working on a large skimmer 8'x12"dia,hope this works better than a beckett!!!!!!

Young Frankenstein · 09/22/2008, 03:48 PM

andrewfl · 09/22/2008, 10:11 PM

any action yet?

ReefingBuddha · 09/23/2008, 04:31 AM

nice DIY, thanks for sharing it. Looking forward to a test run.

ReefingBuddha · 09/23/2008, 04:32 AM

Nice DIY, thanks for sharing.

Looking forward to the video.

liveforphysics · 09/23/2008, 06:09 AM

Thanks for all the kind words guys!

I will see if I can fit a trip to the pool into my schedual today after work to make a video. Hopefully I won't drop another video camera into the pool... Don't ask...

Best Wishes!

-Luke

ReefingBuddha · 09/23/2008, 07:32 AM

sounds good.

Any chance for a saltwater test?

JoelNB · 09/23/2008, 04:55 PM

noob Q....can I attach a venturi to the output of a submersible pump that draws water in through vents in the housing, and still get good results?

liveforphysics · 09/23/2008, 04:56 PM

Yes.

JoelNB · 09/23/2008, 05:35 PM

Quote:

Originally posted by liveforphysics
Yes.

So, can the bubble size be made small or will I have to add something to achieve this? So far (with the factory air injection) I've found the bubbles are too big.

ihavtats29 · 09/23/2008, 06:28 PM

great build definately on my neat diy project!

ihavtats29 · 09/23/2008, 06:29 PM

lol typo neat= next

BeanAnimal · 09/23/2008, 06:38 PM

Quote:

Originally posted by JoelNB
So, can the bubble size be made small or will I have to add something to achieve this? So far (with the factory air injection) I've found the bubbles are too big.

Yes, the venturi just injects air into the water path. You need to chop the air with something (a mesh wheel, needle wheel, impeller, etc).

JCTewks · 09/23/2008, 09:22 PM

Luke, did you make it to the pool today?

liveforphysics · 09/23/2008, 09:28 PM

I just did my first saltwater testing. The bubble size is very surprising to me.

I think the bubbles are so small because of the low turbulence very high speed stream combined with the small radial inlet holes.

I'm going to post up a video of an airflow test soon. My fish are very mad at me right now. This turns a few hundred gallon reef into something that looks like the inside of a protein skimmer body. Takes about 10 minutes for the bubbles to all leave the water, and stir's up every bit of detritus in the tank.

JCTewks · 09/23/2008, 10:06 PM

Well, there are folks that intentionally inject air into the DT on a regular basis. The thought is that detritus will stick to the bubbles and allow them to be removed by the surface skimmer.overflow and be directed to the protein skimmer. It also helps the corals to shed their mucous layer and facilitates better respiration.

What pump were you testing it on? Will these be as good on the intake of a pump where there is not the pressure "behind" the venturi, but rather suction "in front" of the venturi?

ThaNgBOm321 · 09/23/2008, 11:10 PM

quick q?. why drill strait then angle the drill for the venturi holes?? why not just drill it with a slight angle to begin with?? ( a full and semi in depth explaination would be nice.. but nothing that would take a astro physicist to understand)

thanks

JoelNB · 09/23/2008, 11:33 PM

In my opinion, it's easier that way. Firstly, the bit would slip if you tried to start it at an angle. Secondly, you'll find it easier to get the location and the angle correct.

liveforphysics · 09/24/2008, 01:49 AM

Yep!

JoelNB is right on the money. I drilled it like that because it was easier. I think most people would need a drill press and a basic fixture to drill the holes at an angle, and I wanted to keep this something that anybody could easily do with only basic handtools.

second_decimal · 09/24/2008, 10:25 AM

this tool might do the trick as far as drilling angled holes

rockler dot com/product.cfm?page=5985

its called a mini kreg jig and is a angled drill guide. perfect angled holes.

ThaNgBOm321 · 09/24/2008, 08:17 PM

i was thinking/ looking outside the box. i figured there was a specific reason but that's fine by me.. leave it at K.I.S.S = ^)

are you going to test a venturi in both output and input of the pump?? it would be nice to be able to see know the performance and ## air pull and wattage per operation application..

thanks again

09/23/2008, 04:31 AM	#33
ReefingBuddha Registered Member Join Date: May 2006 Location: Winterpark, FL Posts: 1,330	nice DIY, thanks for sharing it. Looking forward to a test run. __________________ -Tom Current Tank Info: Starting a new 300g In-wall, 600g system

09/23/2008, 04:32 AM	#34
ReefingBuddha Registered Member Join Date: May 2006 Location: Winterpark, FL Posts: 1,330	Nice DIY, thanks for sharing. Looking forward to the video. __________________ -Tom Current Tank Info: Starting a new 300g In-wall, 600g system

09/23/2008, 06:09 AM	#35
liveforphysics Registered Member Join Date: Nov 2005 Location: seattle WA Posts: 541	Thanks for all the kind words guys! I will see if I can fit a trip to the pool into my schedual today after work to make a video. Hopefully I won't drop another video camera into the pool... Don't ask... Best Wishes! -Luke __________________ Beauty and less nagging. The all natural Viagra alternative. :) Current Tank Info: 310gal SPS and others.

09/23/2008, 07:32 AM	#36
ReefingBuddha Registered Member Join Date: May 2006 Location: Winterpark, FL Posts: 1,330	sounds good. Any chance for a saltwater test? __________________ -Tom Current Tank Info: Starting a new 300g In-wall, 600g system

09/23/2008, 04:56 PM	#38
liveforphysics Registered Member Join Date: Nov 2005 Location: seattle WA Posts: 541	Yes. __________________ Beauty and less nagging. The all natural Viagra alternative. :) Current Tank Info: 310gal SPS and others.

09/22/2008, 01:20 PM	#26
BeanAnimal Registered Member Join Date: Feb 2003 Location: Pittsburgh Posts: 20,772	For the nerds in the bunch that NEED numbers and geeky formulas... here is a start: We are working with what are called Herschel Venturi tubes. There are pages of math that can be done, but if you want a good overview of the physics and basic design mechanics and they way the influence the apparatus: http://www.primaryflowsignal.com/PDF...uri-040601.PDF

09/22/2008, 01:39 PM	#27
EnderG60 Plumbing Engineer Join Date: Feb 2004 Location: Atlanta GA Posts: 3,260	man those diagrams are amazingly hard to read. I remember there being a simplified variation of the bernuli(sp?) equation that had the diameter ratio's and the pressure differential. I just forget what book it was in. With that it shouldnt be to hard to get a basic idea of what size on what pressure pump would yeild X air draw.

09/22/2008, 01:41 PM	#28
slandis3 Mr lucky Join Date: Aug 2006 Location: Tipp City OH Posts: 392	What wall thickness acrylic are you useing?

09/22/2008, 02:29 PM	#29
Dkarc Registered Member Join Date: Aug 2007 Posts: 56	Cant wait to see the video....I am working on a filtration system that needs a venturi on the output so I am very interested in this. -Ryan

09/22/2008, 02:41 PM	#30
andrewfl Registered Member Join Date: Jul 2004 Location: fortlauderdale,FL Posts: 46	me to im working on a large skimmer 8'x12"dia,hope this works better than a beckett!!!!!!

09/22/2008, 03:48 PM	#31
Young Frankenstein Moved On Join Date: Feb 2007 Location: Miami Florida. Posts: 3,842

09/22/2008, 10:11 PM	#32
andrewfl Registered Member Join Date: Jul 2004 Location: fortlauderdale,FL Posts: 46	any action yet?

09/23/2008, 04:55 PM	#37
JoelNB Registered Member Join Date: Aug 2008 Posts: 247	noob Q....can I attach a venturi to the output of a submersible pump that draws water in through vents in the housing, and still get good results?

09/23/2008, 06:28 PM	#40
ihavtats29 Registered Member Join Date: Mar 2004 Location: cordova , TN Posts: 2,882	great build definately on my neat diy project! __________________ got reef? Current Tank Info: 29 biocube HQI

09/23/2008, 06:29 PM	#41
ihavtats29 Registered Member Join Date: Mar 2004 Location: cordova , TN Posts: 2,882	lol typo neat= next __________________ got reef? Current Tank Info: 29 biocube HQI

09/23/2008, 09:22 PM	#43
JCTewks Moved On Join Date: Oct 2005 Location: Wilmington, Ohio Posts: 3,040	Luke, did you make it to the pool today?

09/23/2008, 09:28 PM	#44
liveforphysics Registered Member Join Date: Nov 2005 Location: seattle WA Posts: 541	I just did my first saltwater testing. The bubble size is very surprising to me. I think the bubbles are so small because of the low turbulence very high speed stream combined with the small radial inlet holes. I'm going to post up a video of an airflow test soon. My fish are very mad at me right now. This turns a few hundred gallon reef into something that looks like the inside of a protein skimmer body. Takes about 10 minutes for the bubbles to all leave the water, and stir's up every bit of detritus in the tank. __________________ Beauty and less nagging. The all natural Viagra alternative. :) Current Tank Info: 310gal SPS and others.

09/23/2008, 10:06 PM	#45
JCTewks Moved On Join Date: Oct 2005 Location: Wilmington, Ohio Posts: 3,040	Well, there are folks that intentionally inject air into the DT on a regular basis. The thought is that detritus will stick to the bubbles and allow them to be removed by the surface skimmer.overflow and be directed to the protein skimmer. It also helps the corals to shed their mucous layer and facilitates better respiration. What pump were you testing it on? Will these be as good on the intake of a pump where there is not the pressure "behind" the venturi, but rather suction "in front" of the venturi?

09/23/2008, 11:10 PM	#46
ThaNgBOm321 Registered Member Join Date: Feb 2005 Location: Tx, houston Posts: 792	quick q?. why drill strait then angle the drill for the venturi holes?? why not just drill it with a slight angle to begin with?? ( a full and semi in depth explaination would be nice.. but nothing that would take a astro physicist to understand) thanks __________________ YzGyz = Wise Guys ohhh and cows go MOOO!!! 2nd best way is to learn from ones own mistakes but the best way to learn is from others... thx to Randy and so many other for making reefing that much easier

09/23/2008, 11:33 PM	#47
JoelNB Registered Member Join Date: Aug 2008 Posts: 247	In my opinion, it's easier that way. Firstly, the bit would slip if you tried to start it at an angle. Secondly, you'll find it easier to get the location and the angle correct.

09/24/2008, 01:49 AM	#48
liveforphysics Registered Member Join Date: Nov 2005 Location: seattle WA Posts: 541	Yep! JoelNB is right on the money. I drilled it like that because it was easier. I think most people would need a drill press and a basic fixture to drill the holes at an angle, and I wanted to keep this something that anybody could easily do with only basic handtools. __________________ Beauty and less nagging. The all natural Viagra alternative. :) Current Tank Info: 310gal SPS and others.

09/24/2008, 10:25 AM	#49
second_decimal Registered Member Join Date: Apr 2007 Location: houston, tx Posts: 152	this tool might do the trick as far as drilling angled holes rockler dot com/product.cfm?page=5985 its called a mini kreg jig and is a angled drill guide. perfect angled holes. __________________ "one good thing about music, when it hits you feel no pain"

09/24/2008, 08:17 PM	#50
ThaNgBOm321 Registered Member Join Date: Feb 2005 Location: Tx, houston Posts: 792	i was thinking/ looking outside the box. i figured there was a specific reason but that's fine by me.. leave it at K.I.S.S = ^) are you going to test a venturi in both output and input of the pump?? it would be nice to be able to see know the performance and ## air pull and wattage per operation application.. thanks again __________________ YzGyz = Wise Guys ohhh and cows go MOOO!!! 2nd best way is to learn from ones own mistakes but the best way to learn is from others... thx to Randy and so many other for making reefing that much easier