Recent content by bertcoen

But I'm most interested in the theoretical relationships which should apply? 1. Flow rate versus pressure 2. Flow rate versus viscosity 3. Flow rate versus radius = opening of valve

1. The graphs are the actual results of a test, so by extrapolation of the trendline I get 7psi which than indicates the pressure drop. Or is this not correct? If not, why not? 2. A. Valve setting was the same in the test out of which we made that graph. 2. B. The viscosity - temperature...

Ok that makes more sense :).

The graph is the relationship between the pressure we put on the tank and the flow rate (the weight out of the dispensing valve in 30 seconds). The pressure drop of 7psi is indeed the pressure drop over the hoses from the tank to the dispensing valve. If I calculate this theoretically with Hagen...

Ok, so with fluctuating viscosity I would get the same flowrate if other variables/factors remain the same? This feels counter intuitive?

I do believe the coating is Newtonian indeed. No other coatings with known constant viscosity have been tested in the same setup. The curing mechanism of the coating is a humidity reactive system. So every possible unwanted contact with air we try to avoid. Nominal dynamic viscosity is 1,0 Pa.s.

Temperature change, but again that's viscosity change. Is the viscosity relationship linear to the flow rate?

That's indeed something that can be a possible cause, but we don't see changes in dry content when we see changes in material flow, which makes it slightly less realistic.

Hi Erobz, Thanks a lot for the energy equation tip. I'll look a bit deeper into that, but it seems very related to Bernouilli. The pressure in the tank, and the material pressure in the flexible hose just outside the tank is measured with a pressure gauge and we don't notice any fluctuations...

Thanks for the response. I'm indeed into an experimental approach, but I wanted to understand my results a bit better, hence the theoretical counter calculations. What I'd like to know are the relationships, and what theory they should be based on: Flowrate vs pressure = linear this I'm...

Dear all, I'm currently working on a basic coating application and I'm struggling to get the flow rate stable. I'm trying to figure out how to calculate the theoretical flow rate in the application. The coating is stored in a pressure tank, which we put on an overpressure of 15psi. From the...