The velocity of particles is controlled at the outlet to ensure particles fill the whole volume of the heat exchanger. Therefore, additional forces are applied to the particles at the channel outlet to control the velocity of particles, as shown in Eq. (1).
ms is the mass of particle; vz is the particle velocity in the z direction; voutlet is the particle outlet velocity; g is the acceleration of gravity, and Fz is the force on the particle in the z direction.
I want to set this boundary condition in Mfix DEM to fill the particles in the domain using outlet flow control and set velocity at the outlet at 2mm/s as per below
You may be able to use a mass outflow BC and set the particle velocity to 2mm/s
Okay but when I use cyclic condition along z. The particles flows out through the outlet. But these particles don’t enter from the inlet. This means cyclic condition is not working.
Cyclic condition works only when I don’t give any boundary condition for the inlet and outlet.
How to make the particles flow in cyclic behaviour?
Sorry, I don’t understand. Do you want cyclic BCs or do you want to specify an outlet velocity? You can’t have both.
I want cyclic BC but in order to make the particles flow in packed manner I must give outlet reference velocity which is very small.
If its not possible for cyclic condition then how should I control the velocity or mass flow rate of the moving particle bed during cyclic condition?
