From a heated bowl to the cold load there is no conduction AT ALL, that is science not opinion, if there is no heated air passing by it is radiation only (MFLB)
So in solo: there is radiation from the bowl to the load plus some convection due to air passing between glass and hot bowl and tranferring heat by that way.
THERE IS NO CONDUCTION VAPORIZER AT ALL (if you refer to how the load receive heat) only radiation/convection in differents proportion.
No. If you want a quick lesson in conduction, touch a hot iron.....if you can find one these days. Or maybe a hot fry pan? How did you think food in that pan cooks? When I went to school it was by conduction, I assume it still is? We put oil in that pan to aid the conduction transfer, using Wok technology? MFLB is a great example. For while HEATING UP radiation plays a role, when it comes to making vapor only conduction counts. Only herb touching the load gets hot enough?
Nope, no Radiation going on in Solo. At least not at a useful level. Look it up, Radiation only works with a very large temperature difference (called 'Delta' by the Science Guys). As that Delta drops, so does Radiation transfer since 'it goes both ways', that is the two bodies both radiate and absorb energy, equilibrium is when energy out balances energy in.....temperature change stops then. Notice the bathroom heater or campfire only works because stuff is fairly near and much hotter? The formula invloves correction factors for 'emissivity' ('black absorbs heat better than white') for each body, the Delta (in degrees C for SI units) and the square of the distance between (they need to be close to couple well unless there's a huge Delta like between us and the Sun. No Delta (like the cup and stem are the same basic temperature, no chance for IR transfer.
Of course there are lots of conduction vapes, you just named one (MFLB). Radiation vapes, OTOH are quite rare? Only one I know off hand is
Bender?
I'm with you
@Quetzalcoatl, I know metal 'conducts' heat (and electricity), but does conduction require atomic bonds, way over my head!
If I touch a hot object, do I get burned from radiation or conduction (or both?)
I'm with you
@Quetzalcoatl, I know metal 'conducts' heat (and electricity), but does conduction require atomic bonds, way over my head!
Is the glass stem chamber getting heated by conduction from touching a metal oven, or radiation emanating from the oven? And thus conduct the heat to the herb from physical contact with glass or again is it radiation through entropy?
If I touch a hot object, do I get burned from radiation or conduction (or both?)
Asked and answered in the same post, tops in FC efficiency.......
If you had to make contact, that's conduction. Hands down. No atomic level bonding needed, contact at the atomic level is enough. Sometimes we use 'coupling fluids' (like heatsink compound in computers or oil in a fry pan) to improve that. You have to analyze this stuff in terms of heat flow. Such 'barriers' to flow (poor contact) simply result in a 'temperature drop' across that barrier. In the heatsink case, that is a 'degrees C per Watt' number, the higher the flow, the bigger the drop.....or the bigger the drop the higher the flow if you prefer?
To answer the question, when you touch a hot surface all the Radiation transfer is instantly over (modest as it is in comparison) once Conduction (and bad language) starts.
So for anything to be pure convection it would have to find a way of suspending the herb with no contact. So is pure convection impossible, until we master gravity. Does any vape claim to be 100%convection.
What do arizer claim the solo is.?
No, heat is also conducted away all the time (if the surrounding is colder of course, heat only goes one way......) it's just that it has to come into the load faster than leaving for there to be a net increase in calories to make the degrees increase.
I'm not sure what makers claim, nor am I convinced that means anything special if it doesn't fit the established rules of Thermodynamics. They too can be mistaken. I do know that Rene (maker of Vapman) has stated that his vape is a conduction deal, basically zero Radiation (load and pan at same temperature......) and no significant convection (airflow cools, not heats, the load). IMHO he's right.........
I believe the FireFly does
http://www.thefirefly.com/firefly-portable-vaporizer.html. I also think the elevape smart does :
http://elevapesmart.com/technology/
Edit: Rather than defy gravity, I guess you could hold the herb in a heat resistant holster that is attached via non heat conducting fixings.
Otherwise if you used a metal screen suspended that holds the herb, once the screen heats up from the convected air, it will radiate / conduct some heat to the contained product.
I forgot to mention the Grasshopper, claims to be true convection, so I think there are a few out there!
Yep. I'd add Herbal Aire and Volcano to that list. Also the now discontinued Thermovape T1, Evolution and Cera. Also include BOX VAPES, they too are convection?
Folks seem to be attaching a value judgement to this? 'Convection vapes are better...' sort of stuff? I'm not sure that's a good guide, really. And it often seems to lead to guys inventing different rules for heat transfer than I learned in school.
FWIW, the heat flow part of Thermodynamics (the small part of that big area we're discussing here, it's really a very wide study indeed) is very much like electric current. No exact 'Ohms laws' link of course, but like Magnetism there are similarities. But heat (calories) flows (by Convection, Conduction or Radiation) by factors that can be measured and characterized by formula. Knowledge/skills from one technology can help others. Hydraulics (flow of fluids) also fits in some places. Open the valve more (or less) and the flow rate and pressures respond with that change.
Fun stuff.
OF
Edit: I forgot another factor in the rant above about how Radiation coupling works, there's also a factor for the surface areas of the two bodies involved in the transfer. Doubling the surface area, doubles the transfer. In the end, it's the emissivity and spacing that usually dominate. Consider here on Earth we enjoy great weather (Global Warming not withstanding) while on Mercury they melt lead at lunchtime. Same sun, less 'heat trapping atmosphere there....just a lot closer (like 1/6 ours).
OF