Hello all,
My plans to build a tophat seperator got stalled a few years ago. Finally, I'm starting this project back up. I have a homemade impeller blower based on a Pentz design with 8" inlet and outlet. I have most likely overlooked it, but I could not find any other posts or examples of others making any tophats this big. Anyway, at this stage in my planning I wanted to make sure my dimensions for the top hat are big enough to handle the volume of air moving thru that 8" pipe. I am going to use Retired2's build as a reference to compare sizes. Here are my numbers, Please let me know if my logic looks sound:
(for those pedantic math nerds I will be rounding number on occasion.)
Retired2's tophat:
5" ports with 22.5 diameter which is 6" tall
5"diamiter= (2.5*2.5)*pi=20sq"
22.5" diameter = (11.25*11.25)*pi=397.6sq"
397.6*6=2386ci
The ratio between the area of the port and the volume of the tophat is 119:1 (397.6/20=119.3). (I know I am comparing area to volume, but I think it works for what I am trying to accomplish)
My tophat:
8" ports with 22.5" diameter with a height of ???
8" diameter= (4*4)*pi=50sq"
using the Ratio above 397.6*50 gives me a target volume of 5950ci
I then take the Volume and divide it by the area of the tophat: 5950/397.6=15"
Now I have my height at 15"
the rectangular port size should be 50"/15"=3.3"
There for I think I am going to make my tophat 22.5" in diameter by 15" tall with a port transitioning from a round 8" pipe to a square that is 15" tall x 3.5" wide. Does that sound good or do some of you see anywhere I really went astray?
I know everyone here like the eye candy so here are some pics of the outlet pipe I created a few years ago when I started this whole thing. It is an 8" thick-walled PVC pipe with a small bell mouth stretched into it.
The thick wall only let me stretch it a small amount, but I think it is enough to help. Some of the whitepapers only showed the bell mouth curving about that far.
Thanks, Lance
My plans to build a tophat seperator got stalled a few years ago. Finally, I'm starting this project back up. I have a homemade impeller blower based on a Pentz design with 8" inlet and outlet. I have most likely overlooked it, but I could not find any other posts or examples of others making any tophats this big. Anyway, at this stage in my planning I wanted to make sure my dimensions for the top hat are big enough to handle the volume of air moving thru that 8" pipe. I am going to use Retired2's build as a reference to compare sizes. Here are my numbers, Please let me know if my logic looks sound:
(for those pedantic math nerds I will be rounding number on occasion.)
Retired2's tophat:
5" ports with 22.5 diameter which is 6" tall
5"diamiter= (2.5*2.5)*pi=20sq"
22.5" diameter = (11.25*11.25)*pi=397.6sq"
397.6*6=2386ci
The ratio between the area of the port and the volume of the tophat is 119:1 (397.6/20=119.3). (I know I am comparing area to volume, but I think it works for what I am trying to accomplish)
My tophat:
8" ports with 22.5" diameter with a height of ???
8" diameter= (4*4)*pi=50sq"
using the Ratio above 397.6*50 gives me a target volume of 5950ci
I then take the Volume and divide it by the area of the tophat: 5950/397.6=15"
Now I have my height at 15"
the rectangular port size should be 50"/15"=3.3"
There for I think I am going to make my tophat 22.5" in diameter by 15" tall with a port transitioning from a round 8" pipe to a square that is 15" tall x 3.5" wide. Does that sound good or do some of you see anywhere I really went astray?
I know everyone here like the eye candy so here are some pics of the outlet pipe I created a few years ago when I started this whole thing. It is an 8" thick-walled PVC pipe with a small bell mouth stretched into it.
The thick wall only let me stretch it a small amount, but I think it is enough to help. Some of the whitepapers only showed the bell mouth curving about that far.
Thanks, Lance