[zdunol]

Hello,

I'm considering a pipe of 6.4 (1/4") diameter with glycol-water solution flowing at v=0.5 m/2 and I was wondering if the flow will be laminar.
Hands on calculations show that bulk Reynolds number is equal to 500 so it should be fine, but I was worried about high (bulk)velocity = 0.5 m/s so I createad a very ver very simple setup where I considered 0.5m long pipe of this type.

Simulation went smoothly, XY plots at the outlet showed nice quadratic velocity distribution, I wanted to check out Cell Reynolds number distribution at the outlet and It does not look like a quadratic equation It looks a little bit like a quadratic eq. but it bends a little bit to the inside, so the whole thing resembles a smooth T tetris-shape (I hope you know what I mean)
In the centerline the velocity is 0.9 m/s,

So, am I facing a transitional regime in here guys, do you think I should refine the mesh, use double precision solver or let the simulation run longer?
Shouldn't the velocity distribution be similar to Cell reynolds distribution?
btw does anybody know what is typical roughness of silicone tubes?
Kind regards,
Zdunol