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Chuck Boone wrote: > By deeper tissues I assume you mean slower tissues. I would think that >if helium loads these tissues for a period of 25 minutes it should offload in >about 25 minutes unless this is a non symmetrical process, which I'm sure it >is (some realistic variation of exponential / linear perhaps). That's the way it is with Bulhmann. Try a bubble model or the EL model for slower offgassing. > Regardless of the rates of diffusion of two different gasses such as He >and N2, given a fixed period of time for on-gassing and a symmetrical cycle >each gas should off-gas completely in the same period of time. > If at the same time you pore red marbles into a bucket at a rate of 50 per >second and blue marbles into the same bucket at a rate of 100 per second for >10 seconds then pore them out at the same rates for 10 seconds the bucket >should be empty of both groups of marbles at the same moment. > If, however, they are each pored in at different rates that decrease >exponentially and then out at linear rates (or close on both counts) then >there can be a divergence of the points in time at which each is totally clear >of the bucket. > This would be true of all tissues, not just the slow ones, and this is >what I suspect is happening but I am looking for confirmation and a more >thorough description of the process. I am not sure that the exponential / >linear model is valid or uniformly applicable. It's all about tissue tensions. Helium loads faster, so with an identical profile a helium dive will saturate the tissue faster than nitrogen. This could saturate it to the point where you can no longer ascend without making a stop. the nitrogen is slower, so you might not get the tissue saturated enough to call for a stop. -Jon -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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