What was wrong with the last post

I have realised that I was using the equation for water flow in an enclosed pipe to calculate the Reynolds' number. Problem is that in the photograph, the water was clearly falling through the air. The viscous drag on the outsides of the column will therefore be reduced. I can't easily find an equation for this situation but I did find a short film covering this topic https://www.youtube.com/watch?v=VoBc60iUq2I