Thermal imaging of (SW) scrubber post-dive

[rjack321]

Absolutely. Looking at Clarke’s simulations high heat is in the middle, actually behind the conversion process along the walls which due to the lower temperature is more stretched out and further down the stack. So I expect braketrough well before the hotspot is at the end of the stack. It are just “pretty pictures confirming a theory”. Indicating sorb is a nice comparison, however this is giving data without excavating the scrubber.

The center of the axial is ahead of the walls because the walls are cooler than the center and the reaction front is slower there and lagging behind the central cone. So when your hottest heat line in the inhale side scrubber is halfway(?) 2/3rds(?) up the canister the reaction front in the center of that scrubber is getting close to breakthrough.

 

[ErikH]

The center of the axial is ahead of the walls because the walls are cooler than the center and the reaction front is slower there and lagging behind the central cone. So when your hottest heat line in the inhale side scrubber is halfway(?) 2/3rds(?) up the canister the reaction front in the center of that scrubber is getting close to breakthrough.

The co2 is more easily absorbed in the hot sorb than at the cooler walls. Therefore the co2 will travel further down to be fully absorbed there, compared to in the center. If you see John Clarke’s articles/website he has simulations showing exactly that. It also makes sense: cold sorb is less effective so it takes more (a longer path) to be fully converted.

 

[rjack321]

The co2 is more easily absorbed in the hot sorb than at the cooler walls. Therefore the co2 will travel further down to be fully absorbed there, compared to in the center. If you see John Clarke’s articles/website he has simulations showing exactly that. It also makes sense: cold sorb is less effective so it takes more (a longer path) to be fully converted.

I'm not sure what you are trying to conclude but the center of the axial canister is consumed before the outer shell which is cooled by the walls. So when your IR shows the walls being warmest 1/2 or more up the inhale side that means the center cone is already getting close to breakthrough. Your measurements with the heat "still" X centimeters down from the inhale side exit are not a conservative estimate of how close you are to breakthrough. By the time the walls are being consumed way up by the inhale exit the center sorb is long since fully consumed and you have a CO2 hit in progress.

 

[ErikH]

I'm not sure what you are trying to conclude but the center of the axial canister is consumed before the outer shell which is cooled by the walls. So when your IR shows the walls being warmest 1/2 or more up the inhale side that means the center cone is already getting close to breakthrough. Your measurements with the heat "still" X centimeters down from the inhale side exit are not a conservative estimate of how close you are to breakthrough. By the time the walls are being consumed way up by the inhale exit the center sorb is long since fully consumed and you have a CO2 hit in progress.

The heat image, a couple of minutes out of the water, will most likely show the average heat along the center axis as the heat in the middle will conduct to the outside, so it will be a 'blurred' image. I don't want to conclude too much from it.
The video you linked shows the heat intensity - *not* the co2. If you take a look at one of his other video's he shows the simulated absorbtion reaction. This video shows that the actual breakthrough will be along the colder walls - not in the middle. So, yes, the CO2-front will form a cone, however it is a inverted one with the CO2 along the walls leading and the center lagging.

 

[rjack321]

The heat image, a couple of minutes out of the water, will most likely show the average heat along the center axis as the heat in the middle will conduct to the outside, so it will be a 'blurred' image. I don't want to conclude too much from it.
The video you linked shows the heat intensity - *not* the co2. If you take a look at one of his other video's he shows the simulated absorbtion reaction. This video shows that the actual breakthrough will be along the colder walls - not in the middle. So, yes, the CO2-front will form a cone, however it is a inverted one with the CO2 along the walls leading and the center lagging.

It's only on the margins because the total capacity there is reduced. Your "hot halfway up" image is showing near breakthrough not "it's got time left"

 

[DOBY]

 

[ErikH]

It's only on the margins because the total capacity there is reduced. Your "hot halfway up" image is showing near breakthrough not "it's got time left"

Yes. Nobody claimed otherwise. Happy you agree.