Re: [new_distillers] Re: Plastic jacketed condensers
The more I think about it, the less I think the tubes would get
flooded. Even at 80ml per min condensate, that's less than 4ml per min
for each tube, and at a guess that's one or two drips per second,
which would only be a trickle on the inside of the tubes - nothing
that's going to stop rising vapor.
On 7/6/07, Harry <gnikomson2000@...> wrote:
> --- In email@example.com
> <mailto:firstname.lastname@example.org> , dearknarl <dearknarl@...>
> > Thanks Trid and Harry,
> > I already figured that the condensing power was plenty with that many
> > pipes, and the summated cross sectional area is equivalent to at least
> > a 20mm ID pipe which wouldn't flood, but I was actually concerned
> > about the surface tention of the liquid causing flooding or
> > spluttering becasue of the smaller diameter pipes. What is the typical
> > tube size that people use for shotgun/gattling gun condensers?
> > Cheers,
> > knarl.
> Well I don't know what the typical size is that people use, but I can
> tell you the correct size...6mm OD tube.
> Reasons? 6mm tube is actually 6.35mm OD and 4.53mm ID with a 0.91mm
> wall thickness. This 4.53mm inner diameter is the perfect size for
> liquid droplets to form and travel. If you go much larger in bore size,
> you risk getting 'blow-by' of uncondensed vapours because the cooling
> effect reduces rapidly once you get past 2mm from the condensing surface
> ( the tube wall ). Thus a 4.53mm bore is right for bigger (relatively)
> liquid droplets and almost perfect to eradicate blow-by.
> There won't be (or shouldn't be) any vapour pressure forcing the liquid
> out of the tubes because as you have already discovered, the combined
> area of 21 tubes is quite large.
> Area of a circle is Pi times radius squared ( ð r² ).
> 3.1416 x (½ x 4.53)² = 16 sq.mm
> By 21 tubes = 16 x 21 = 336 sq.mm
> That's about equal to a single 22mm OD tube with a 0.91 wall.
> Because the condenser is in a vertical or 45° downward configuration,
> gravity should take care of any surface tension of the liquid in the
> tube bores. If in doubt, test it with a cup of water poured in the top
> end vapour side. You'll see it readily runs through.
> regards Harry