Dear raghu,

Apply the motion laws and Newton’s laws.

velocity = acceleration * time

distance = * acceleration *time^2

Force = mass/time * velocity

Dynamic factor = 2

(acceleration = gravitational acceleration)

As the velocity is a vector, use vector addition.

Simple(?)

success

Teus ■

All granular flow pressures and wear actions can be determined by a good DEM code, regardless of impingement angle, material build-up, rock sizes & shapes, moist vs. dry, tonnage, and point of impact separated by gravity effects.

See our website for details: http://www.conveyor-dynamics.com/rocky.htm

We now have multiple solutions for gas dynamics, and rock breakage. Code is coupled to ANSYS FEM for force and displacements, and ANSYS FLUENT for gas and fluid interactions. ■

Hello Raghu,

Regarding force acting on chute body, some information is as below:

Force F = (Mass m) x (Acceleration a).

Acceleration a = (Outgoing velocity v2 – Initial velocity v1) ÷ (Time t).

Thus F = m x (v2 – v1) ÷ t = (v2 – v1) x m ÷ t

F = (Flow rate kg/s) x (v2 – v1).

This is the formula widely used to find force on turbine blade.

So in your case find out mass flow per second which is (capacity mtph) ÷ (3.6 x belt velocity).

Find out velocity v1 at entry point to chute impact zone and v2 at exit point of chute impact zone, and use it in above formula. Both the velocities are vectors. Chute portion is wall plus shelf which cause the aforesaid velocity change.

For finding force perpendicular to wall, consider v1 and v2 components perpendicular to wall. Similarly, for finding force along the wall direction, consider v1 and v2 components along the wall.

By the way this force could be practically same as material acceleration resistance being calculated in conveyor design?

The main load for the chute happens to be its weight plus material filling say 60% etc. due to blockage, once in a while. The impact force may be small compared to the above?

The important issue will be to find the outgoing velocity which is the subject of bulk material handling.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science And Application Design For Belt Conveyors (print November, 2012)

Author of Book : Belt Feeder Design And Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■

The evenness of the impact load clearly depends on the uniformity of the mass along the belt, as reflected by the conveyor loading process. Wear is cause by sliding attrition in the dispersion of material from the point of impact. There is much information on chute design to minimise impact wear by Alan Roberts and others from TUNRA.

Regards

Shakib Sajjad

Mechanical Engineer.[/QUOTE] ■