Chimney size vs air hole size - Mathmatics (airflow question)

[wrice4]

Hey guys so I am debating two rta tanks right now, the goliath v2 and the zephyrus. I am trying to figure out which one has more airflow and I am getting mixed reviews.

Some say the zephyrus does because of the 4X 3mm air holes in the deck (2 on each side). The goliath v2 has 2X 3.6mm air holes on each side (1 on each side). The people that say the goliath v2 has better airflow state it because the chimney is bigger, 7.1mm vs 6mm.

So my question is will a bigger chimney or more deck holes provide more airflow. From my understanding it doesn't matter how many holes you have in the deck, only a certain amount of air can travel through the chimney at one time, so if the goliath v2 has a wider chimney it would have better airflow, even though there is 2 holes per coil on the zephyrus ....right???

I'm trying to get a build that can handle high wattage and keep the coil from getting hot.



1 more question. For coil coolness, and high wattage vaping, would this same concept apply (chimney width), or would the zephyrus be better since it has 2 air holes vs 1.

 

[gadgetkeith]

i dont have either of the tanks mentioned but those who do will chime in and help to answer ya questions

but another thing to consider is the size of the holes in the base of the coils themselves or the rba deck sections

i love my kanger stm,s but i tend to rebuild the occ coils rather than the rba deck as the holes in the bottom of the occ coils are larger and give me a more airy draw the rba deck is nice but i find the air flow just a little tight for me

so although lots of tanks have large air adjustment and some have larger chimneys its all realy down to how much air you can pull through the actual coil section be it the occ coils or rba deck sections

just something else to check into when looking for a new or different tank

coil temp is not only limited by air flow but mixture everything be it wicking coil placement in relation to air flow and coil design etc etc etc

 

[sparkky1]

Zephyrus Sub Ohm Tank by Youde $19.99
I've got a .3 on mine @ 80 watts it's plenty good.The goliath v2 I tried the AFC would barely even turn, had to use a butter knife.If it's not enough airflow you may want to look at RDA's.

 

[wrice4]

Zephyrus Sub Ohm Tank by Youde $19.99
I've got a .3 on mine @ 80 watts it's plenty good.The goliath v2 I tried the AFC would barely even turn, had to use a butter knife.If it's not enough airflow you may want to look at RDA's.

I am strictly looking at both of these devices mainly for the rba section.

 

[Wraith504]

I am strictly looking at both of these devices mainly for the rba section.

wait till the end of the month and get a cthulhu v2 or get a silverplay v2

 

[wrice4]

wait till the end of the month and get a cthulhu v2 or get a silverplay v2

Vapordna already has the silver play 2 in stock. What makes you like these two tanks better than the zephyrus or goliath v2 ?

 

[Alien Traveler]

Not more air can travel through chimney than can travel trough airholes, and vice versa. Area of openings is proportional to squares of their diameters. So:

................Area of..............Area of..... .......Bottleneck
................airholes/pi/4 .....chimney/pi/4.....area
Zephyrus......36 ..... .... .. ....36 ..... .... .... ......36
goliath.........26 ... .... .. ......50.5 ..... .... .... ....26

So, theoretically Zephyrus should have better airflow.

 

[wrice4]

Not more air can travel through chimney than can travel trough airholes, and vice versa. Area of openings is proportional to squares of their diameters. So:

................Area of..............Area of..... .......Bottleneck
................airholes/pi/4 .....chimney/pi/4.....area
Zephyrus......36 ..... .... .. ....36 ..... .... .... ......36
goliath.........26 ... .... .. ......50.5 ..... .... .... ....26

So, theoretically Zephyrus should have better airflow.

I understand, but where did you get those numbers?

 

[Alien Traveler]

I understand, but where did you get those numbers?

The way I am looking at it is:

The Zephyrus has 4 (3mm) air holes, in the deck, but the chimney size is only 6mm. So even though the 4 air holes comes out to 12mm all together, you can only pull enough air to cover 2 of those holes...So you are being restricted to 6mm of space for airflow, when having 12mm of space on the deck.

Example: two of the 3mm holes is 6mm, so technically the other 2 air holes can't provide more airflow.



The Goliatch v2 has 2 (3.6mm) air holes, in the deck, but the chimney size is 7.1mm. So you can basically get the full amount from both air holes to have all of the 7.1mm used.


Maybe I am totally thinking of this the wrong way, so please correct me if I am. I would assume the Goliath v2 would have more airflow, to the mouth, because of the chimney allowing more air to passthrough at one time.

We should not compare diameters, we have to compare areas.
Area of a round hole = (pi/4)*(D*D), where D - diameter. Or we can say that area is proportional to diameter square and compare only these numbers.

For each of zephirus holes D*D=3*3=9. For all four holes it will be 9*4=36
For zephirus chimney D*D=6*6=36.
Looks like good design - area of airholes is equal to area of chimney.

 

[wrice4]

We should not compare diameters, we have to compare areas.
Area of a round hole = (pi/4)*(D*D), where D - diameter. Or we can say that area is proportional to diameter square and compare only these numbers.

For each of zephirus holes D*D=3*3=9. For all four holes it will be 9*4=36
For zephirus chimney D*D=6*6=36.
Looks like good design - area of airholes is equal to area of chimney.

The way I am looking at it is:
Math forumla Area=pie X r(squared)

Area of a circle: ....Holes..........per hole....Total.........Chimney
Zephyrus ................4......X.......7.07.......28.28.........28.27
Goliath V2...............2......X.......10.18.....20.36.........39.59



The Zephyrus has 4 (3mm) air holes, in the deck, but the chimney size is only 6mm. So even though the 4 air holes comes out to 12mm all together, you can only pull enough air to cover 2 of those holes...So you are being restricted to 6mm of space for airflow, when having 12mm of space on the deck.

Example: two of the 3mm holes is 6mm, so technically the other 2 air holes can't provide more airflow.



The Goliatch v2 has 2 (3.6mm) air holes, in the deck, but the chimney size is 7.1mm. So you can basically get the full amount from both air holes to have all of the 7.1mm used.


So by comparing area, the zephyrus would be able to use the entire chimney, with the 4 deck holes, as the goliath v2 only being able to use half of the capacity of the chimney since it has 2 holes. So in theory you are right, the zephyrus would have more airflow? Am I understanding this right?



So now the question is , with the goliath v2 deck being larger, and can fit bigger builds, would this allow better flavor and clouds, or be bottlenecked as well with the smaller airflow.

 

[Alien Traveler]

The way I am looking at it is:
Math forumla Area=pie X r(squared)

Area of a circle: ....Holes..........per hole....Total.........Chimney
Zephyrus ................4......X.......7.07.......28.28.........28.27
Goliath V2...............2......X.......10.18.....20.36.........39.59



The Zephyrus has 4 (3mm) air holes, in the deck, but the chimney size is only 6mm. So even though the 4 air holes comes out to 12mm all together, you can only pull enough air to cover 2 of those holes...So you are being restricted to 6mm of space for airflow, when having 12mm of space on the deck.

Example: two of the 3mm holes is 6mm, so technically the other 2 air holes can't provide more airflow.



The Goliatch v2 has 2 (3.6mm) air holes, in the deck, but the chimney size is 7.1mm. So you can basically get the full amount from both air holes to have all of the 7.1mm used.


So by comparing area, the zephyrus would be able to use the entire chimney, with the 4 deck holes, as the goliath v2 only being able to use half of the capacity of the chimney since it has 2 holes. So in theory you are right, the zephyrus would have more airflow? Am I understanding this right?

Something interesting happened (glitch, editing?).
Now it looks like I have answered your question before you asked it (see above).

 

[wrice4]

Something interesting happened (glitch, editing?).
Now it looks like I have answered your question before you asked it (see above).

I had to edit the post, lol.

 

[itskohler]

Having both tanks, The Goliath breathes far better than the Zephyrus. Ya, the Zephy has more airholes, but the chamber with coils inside restricts your draw substantially. I wish I had an airflow meter to prove this, but I dont. Even with dual Ni200 coils in the Goliath V2, and simple 5 wrap micro coils in thwe Zephy, the Goliath is much better.

 

[wrice4]

but the chamber with coils inside restricts your draw substantially.

I forgot about this part. So lets get down and gritty on this, for fun:

So without a build the zephyrus, it is already using up 100% of the amount of airflow that is running through the chimney. So if you put 2 coils in it, it "could" reduce that amount by half which would be 14.135 (total area divided by 2).

The goliath v2, on the other hand, is only using 50% of the max amount the chimney can handle, so if you put 2 coils in it, it "could" still use the 100% max of both air holes, which would be 20.36. Therefore, mathematically, the goliath v2 would be able to draw in more air in this aspect.



This is way to deep, and way more in depth that I was asking/thinking, but I find it interesting now, lol.

 

[itskohler]

Correct-omondo.

 

[Hans Wermhat]

Another thing to consider... Empty airspace inside the chamber mutes flavor and thins clouds.

 

[wrice4]

Another thing to consider... Empty airspace inside the chamber mutes flavor and thins clouds.

Good point. I have heard both tanks have great flavor though. I went ahead and purchased the goliath v2 and I'll buy a zephyrus v2 when it comes out.

 

[itskohler]

Great choice my friend!

 

[edyle]

Hey guys so I am debating two rta tanks right now, the goliath v2 and the zephyrus. I am trying to figure out which one has more airflow and I am getting mixed reviews.

Some say the zephyrus does because of the 4X 3mm air holes in the deck (2 on each side). The goliath v2 has 2X 3.6mm air holes on each side (1 on each side). The people that say the goliath v2 has better airflow state it because the chimney is bigger, 7.1mm vs 6mm.

So my question is will a bigger chimney or more deck holes provide more airflow. From my understanding it doesn't matter how many holes you have in the deck, only a certain amount of air can travel through the chimney at one time, so if the goliath v2 has a wider chimney it would have better airflow, even though there is 2 holes per coil on the zephyrus ....right???

I'm trying to get a build that can handle high wattage and keep the coil from getting hot.



1 more question. For coil coolness, and high wattage vaping, would this same concept apply (chimney width), or would the zephyrus be better since it has 2 air holes vs 1.

looking at those numbers they both sound pretty similar to me, and you might get most airflow restriction from the coil design