PPRuNe Forums - Air supply nozzles and Covid-19

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- - Air supply nozzles and Covid-19 (https://www.pprune.org/tech-log/632733-air-supply-nozzles-covid-19-a.html)

Quote:

Originally Posted by 320busboy (Post 10792796)

If your infected and breathe horizontally into a stream of mostly downward vertical medium velocity air I’d tend to think it would help the downward journey toward the bilge for recirc.

added to the already downward overall flow (is why you only smell a fart for a fraction of the usual marinating time) then it would only help it.

if your hot, use it. If your not, don’t. The quality of the air is better than the terminal you walked through and the bus or taxi you arrived in.

Or you can email them to clarify why they make that statement.

320busboy, you should rename yourself to 320fanboy instead.

Have you ever been in the cabin when someone nearby (or yourself) has dropped their guts (passed wind), seen the heads start to swivel? What about food smells. I'd take AB's talk on the air movement in the cabin with a pinch of salt.

I accept that eventually we will need to accept the risk, but you appear to proport there is nothing to be concerned about at all.

Quote:

Originally Posted by exfocx (Post 10794837)

I accept that eventually we will need to accept the risk

However it would seem possible to ensure that, on some aircraft at least, there is very little risk to the passengers. If each passenger is enveloped in their own cocoon of air direct from a nozzle, and if the filters are exchanged with sufficient frequency, the passengers should be at little risk of catching CV.

A jet of gas like that from a nozzle will entrain some of the ambient air that surrounds it. In this case, the ambient air would include the particles being blown around by other passengers' nozzles. So it's unlikely that anyone would cocooned in pure air from a nozzle.

Of course, if you added a hose connected to the nozzle and a hood of some kind, it might be a different story.

Even without the "hose and hood" it is probably far better than having closed nozzles.

Quote:

Originally Posted by occasional (Post 10794890)

.... If each passenger is enveloped in their own cocoon of air direct from a nozzle, ...

From Airbus yesterday:

Open nozzles will not provide a protective cone of air around the passenger and may assist in blowing the particles about the cabin.

They are doing further studies on airflow.

Quote:

Originally Posted by compressor stall (Post 10801997)

I was listening to the 1600 hr UTC webinar - the nozzles interrupt the vertical airflow that the maximum cabin air exchange rate is based upon. Similarly, so too does opening of the flight deck windows - it introduce a longitudinal cabin airflow they want to avoid as that too interrupts the cabin air exchange rate.

Quote:

Originally Posted by compressor stall (Post 10801997)

Any explanation ? I could understand it there is not enough power to keep all the nozzles blowing at full blast.

Quote:

Originally Posted by occasional (Post 10802379)

Any explanation ? I could understand it there is not enough power to keep all the nozzles blowing at full blast.

what more do you need? Plenty of explanations of mine and others above.
perhaps a course in fluid dynamics 101 might assist if you’re unwilling to accept.

Quote:

Originally Posted by compressor stall (Post 10803054)

what more do you need? Plenty of explanations of mine and others above.

So far I have not seen any attempt to explain something which appears inherently unlikely.
And I have already studied more than enough physics, thankyou.

Boeing (for the 737) states more or less the same as Airbus.
https://cimg0.ibsrv.net/gimg/pprune....1f083a823f.png