Dear mspirs2,

First of all ; K-values are related to the calculation algorithm that is used..

You do not state the calculation method.

Normally these values are calculated back from lab tests and or field tests.

They are therefore valid for the circumstances under which they are derived.

That can result in K-values that, in themselves, are a function of the solid loading ratio (SLR) and the turbulence of the flow (Re-number).

You have to check, whether the conditions for the K-values, you use, are comparable with the conditions of your case.

I understand your problem: having a calculation program, but not the data to use it.

success ■

dear Mr pamda,

The Re-number is related to viscous forces and the Fr-number is related to inertia forces.

In ship modeling, the prototype is tested at the same Fr-number as the ship, where the wave resistance is derived and scaled and the friction resistance is calculated directly.

The K-factor covers the energy losses, due to the collisions of the product between the particles and between the particles and the wall.

In a high turbulent flow (Re above a certain value, with the pipe diameter as the ruling distance), the chance that a particle collides and the involved collision energy are also high.

In fact I measured a better conveying in a sub turbulent flow installation for cement (3 inch pipe – 80 m)

In other words the K factor is Re dependant and that is the reason that I opt for RE.

Other calculations that have calculated back the K-factor based on the Fr-number should be used with that K-factor.

success ■