[pure-silver] Re: Sink Decisions and Waterproofing
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 22 Jul 2005 22:43:09 +0200
Peter Badcock a écrit :
Claudio,
I agree with you that it is a good idea to lower your vent tube. This
is how I placed mine - just above the trays. I also have a sheet of
air blowing across There is one other area I can suggest you change
with your ventilation tube. As you are extracting the air from one
end of the pipe, unless you have an extremely high negative pressure (
i.e. vacuum) at the end of the tube, the relative pressure drops
between each hole across the tube will result in radically different
flow rates at one end of the tube compared to the other end. To get
around this I constructed a symmetrical design (using a Y shaped
splitter in the middle see
http://www.users.on.net/~tallowood/images/DSCN0845_sink%235.jpg
<http://www.users.on.net/%7Etallowood/images/DSCN0845_sink%235.jpg> ).
Additionally, and this is just as important, in my latest prototype
(not the one shown in the photo), I changed the continuous slot
design into multiple diagonal slots that became larger towards the end
of the two pipes. An ASCII art attempt gives the following
| |
| |
| |
| |
/ /\ \
----------------------------- -- ------------------------------
| /// // // / \ \\ \\ \\\ |
| /// // // / \ \\ \\ \\\ |
-------------------------------------------------------------------
I used a spirometer (i.e. a flow meter that you can see in the photo)
to tune the hole sizes, since there are no easy formulae for
calculating the fluid dynamics in this highly non-typical situation (I
didn't want to resort to finite element analysis!)
regards
Peter
Sorry to reply you so late.
I like your design, sounds good.
Is a spirometer a common tool in your darkroom ?!?! :-)
Regards,
--
Claudio Bonavolta
http://www.bonavolta.ch
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