[jondee86]

Interested in this question as I will be looking to implement a water injection
system myself. Because the intake manifold that I will be using (4AGZE) has
unequal runners, getting even water distribution to the cylinders will be a
challenge.

The flow simulation that you have used as an example is a rectangular
ventilation duct. A smaller tube operating at higher velocity will get much
more flow separation on the inside radius of the bend, and this will create a
lot of turbulence immediately after the bend. I would suggest that placing
the injector on the engine side of the duct immediately after the MAF would
give the most effective mixing of mist and air.

As far as the orientation of the nozzle to airflow is concerned, I suspect
that angling the jet into the oncoming airstream is unnecessary. However,
I have read that recessing the tip of the nozzle out of the airstream helps
to achieve superior atomisation. This is something I will be researching
before I decide on how/where to mount my post blower nozzle.

Cheers... jondee86