Why are some coils considerably hotter at the same heat flux

[astronomicals]

All my macro coils were substantially hotter vape than the micros. Even more confusing is that the micro has a lower heat capacity than the macro so it should be firing faster (i think). I was using substantially more wattage (nearly double) in the macros but the heat flux should have been equivalent. The macro coils were dirtying the wicks fast so their was issues. Why were they hot?

http://www.steam-engine.org/coil.as...&hfnw=77&str=2&wl=117.39438651262138&id=3.175

http://www.steam-engine.org/coil.asp?a=true&tp=1&s=dp&r=0.4&hfnw=34&awg=26&id=1.588

there is the micro i have now and one of several macro builds i did. all the macros were hot so it wasnt just that particular build.

If I had to guess Id say it has something to do with ~160mm of surface area vs. ~400mm surface area.

 

[93gc40]

2x the surface area means the bigger coil has more potential for transferring heat, and the smaller coil will heat to it's hot temp faster. The smaller coil will also be hotter at a given wattage.

 

[Das Auto]

Larger coils and larger gauge wire are going to need more current to generate as much heat as a smaller coil. More current = more heat. the smaller coils will only get so hot, where as the larger coils can and will get hotter. Your macro coils are vaping hotter than your micros because they can "handle" more heat. And the micro coils Should have a lower heat capacity then then the macro's, and simple explained that is due to surface area being increased from the micro to the macro.

You pretty much answered your own questions in your op!!