The Pyrex SS hybrid Wick
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Im also curious about that as well. On my DID20 the airhole always aligns so good vape , on my clone airhole does not align and it is a harsh vape until i made it align although its out of my rotation since another DID purchase.
Waiting for Dan to chime in when he gets the time and to hear his thoughts on the airflow .
Thanks Dan
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Only one person, the OP, has tried this yet, but post #15 addresses this to a degree.
I would think if it tasted like crap, Dan might have mentioned it.
I just looked over the previous posts in detail. If the heat transfer is primarily radiative then there are a few things that may be true:
1) The thickness of the glass is not important to the first order.
2) A glass tube with a blackened inner wall and a loose fiber wick may work as well as long as the vapor can get out without being reabsorbed by the cooler interior fluid. A very thin sheet of stainless steel with a selective coating may also work. The use of a high temperature material as the wick is probably not necessary. Lots of optimization work left to be done.
The radiative theory could be tested by using comparing the performance of darkened (oxidized) mesh verses a lighter, less absorbing mesh. The darker mesh should produce more vapor. This may be difficult to do in a controlled fashion as the amount of heated thermal mass must be controlled between the two schemes. This is mesh plus fluid.
It's late here and I'm sure other folks can come up with a better experimental method. I'm going to bed.
1) The thickness of the glass is not important to the first order.
2) A glass tube with a blackened inner wall and a loose fiber wick may work as well as long as the vapor can get out without being reabsorbed by the cooler interior fluid. A very thin sheet of stainless steel with a selective coating may also work. The use of a high temperature material as the wick is probably not necessary. Lots of optimization work left to be done.
The radiative theory could be tested by using comparing the performance of darkened (oxidized) mesh verses a lighter, less absorbing mesh. The darker mesh should produce more vapor. This may be difficult to do in a controlled fashion as the amount of heated thermal mass must be controlled between the two schemes. This is mesh plus fluid.
It's late here and I'm sure other folks can come up with a better experimental method. I'm going to bed.
Wow, this is interesting. We should ask Wilmad to make these at optimal lengths so they don't need to be cut.
If there's a coop, I'm in.
If there's a coop, I'm in.
Final thoughts on airflow. This is probably going to be a "totally different head". Hee, hee, I told you I needed to go to bed. The vapor is going to be produced in a constrained cavity (more like a carto) than in a free air mechanism like a traditional atomizer.
Vapor production will drive the fluid in both directions unless a pressure break is provided. A break in the tube wall before the wick passes through the bulkhead may prevent backflow and may serve as an inlet inlet but airflow through the wick is going to be constrained if it is tightly pack as SS wicks have been in the past if it is directly drawn on.
Nitey night.
Vapor production will drive the fluid in both directions unless a pressure break is provided. A break in the tube wall before the wick passes through the bulkhead may prevent backflow and may serve as an inlet inlet but airflow through the wick is going to be constrained if it is tightly pack as SS wicks have been in the past if it is directly drawn on.
Nitey night.
I was thinking something similar. The answer may be to build hollow wicks the width of the pyrex tube and have an air inlet at wick base (just above entering the tank top). That would allow capillary action to fill the outside and the inside surface would become the vapor producing surface.
Very cool, fun to brain storm this stuff.
Very cool, fun to brain storm this stuff.
Damn, who would have thought I'd actually wish I was going into work tomorrow 
. Pretty sure there are NMR tubes in the "quick stores" storeroom. Oh, well, guess I'll wait until Monday and if there aren't any, I'll order a couple from Wilmad.
. Pretty sure there are NMR tubes in the "quick stores" storeroom. Oh, well, guess I'll wait until Monday and if there aren't any, I'll order a couple from Wilmad.
Edit: Maybe a precision drilled air hole that forces the flow of air across the top of the hollow wick would cause enough pressure difference to evacuate the center expansion chamber (the hollow channel) and draw liquid up the wick (similar to how an old fashioned artist water colors atomizer or perfume sprayer works). This may have the same effect as the air on the vaporizing surface of normal wicks.
Actually the vapor pressure is already very high (witness the video). The best method may be to use this as an active vapor source that doesn't need forced airflow to operate to extract the vapor from the heat transfer area. Since the coil can be isolated, the vapor temperature is not going to be driven my the airflow velocity over the coils.
This is getting interesting.
This is getting interesting.
You guys are doing a great job of brain storming. I like the idea of a tube with SS and flow through air. With more experiments it may be that if the wick extends past the tube and you direct air over that part you get something similar. It just seems logical to pull the room temperature fluid up, heat in the tube and vent out the top while introducing air over that top part.
Wouldn't extending the wick beyond the glass tube increase the chance of juice dripping onto the coil and gunking it up?
Looking at the 15mm version of the tube in the one video, it appears that Dan did that to keep the mesh from dropping down. Maybe I was seeing things at the time.
Most of the vapor is going to be produced very close to the glass surface. The vapor pressure will be the greatest there. If this area was more porous to airflow then the vapor could find it's way to ambient at the end of the tube along the surface. The interior unheated fluid would move radially towards the glass surface. This is where the wicking transport from the resivoir is needed. So the ideal wick would be dense near the axis for liquid transport and much less dense near the cylindrical surface to allow vapor transport/escape.
Holy Crap, what has been going on?
Too many question to go over tonight, so I will hit some tonight.
Taste, Comparable to a SS setup, Airflow irrelivent in this set up. Air flow is critical on the SS coil setup to reduce hot spots and burning juice (cause for massive TH and off flavor). Airflow in this setup is just needed to move the vapor out. Air flow is preferred not directed at the coil, reduces vaporizing temps. I keep the airflow 90 dregree off the wick, no off taste or massive TH.
I will start back where I left off commenting tomorrow and try and answer all questions.
Dan
Too many question to go over tonight, so I will hit some tonight.
Taste, Comparable to a SS setup, Airflow irrelivent in this set up. Air flow is critical on the SS coil setup to reduce hot spots and burning juice (cause for massive TH and off flavor). Airflow in this setup is just needed to move the vapor out. Air flow is preferred not directed at the coil, reduces vaporizing temps. I keep the airflow 90 dregree off the wick, no off taste or massive TH.
I will start back where I left off commenting tomorrow and try and answer all questions.
Dan
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