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Old 5th January 2007, 13:29   #15 (permalink)
paulraymaekers
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Current Rebreather/s:
rEvo
Other CCR
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Other Rebreather/s:
rEvo
Other CCR
Home Build
 
Join Date: May 2005
Location: belgium
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Re: dwell-time calculation: axial vs radial

Quote: (Originally Posted by silent running) View Original Post
Hi Paul, granted the better insulating qualities of radials are part of increased efficeincy, but do you really think that the rest of the increased efficeincy is only do to such vaugeries like "water stocking"-I assume you mean the swelling of the used sorb-or non-uniform packing? And how do either of these things exist outside the realm of actual dwell time? Seems to me that water stocking is likely to force a tighter, more uniform pack as the sorb expands and would influnce the non-uniform packing and thus increase dwell time. But then again, why wouldn't that also be true for an axial?
...
.... well, things are always more complex to explain...

conc water stocking: just one example, imagine an axial scrubber in horisontal position during diving (like CK, Inspi, Meg....)

exxes water coming from the reaction will tend to move frome inlet to outlet, more water at the outlet, because the gasflow is transporting humidity towards the outlet side of the scrubber, but also to one side of the scrubber, namely towards the divers back, because gravity does play its role also: meaning one side of the scrubber will be more charged and 'compacted' than the other, provocing higher gas-flow trough the less compacted part of the scrubber... giving less 'overal' efficiency of the scrubber

this phenomena is not there where the gasflow in the scrubber is vertical during diving, (like MK or rEvo) or less where the hight versus width ratio is low (like boris)

even in the rEvo the 'compacting' effect is reduced strongly by the removal of exxess water between the 2 scrubbers (the condensating area of the coverplate)

just one other thing that plays a role, among others...

regards
paul
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