bigben2k, wouldn't any bend in the pipe act as a slight turbulator? Owning to the tendency of liquids to 'stire' when they bump into eachother at relatively sharp bends
metarinka, I am haveing trouble envisioning exactly how you plan to run these concentric circles.
Are you going to winde it like a large spring? Or are you going to have a verticle pipe with two groups of half circles running to another verticle pipe.
Or am I WAY off?(Likely, very likely.)
