id="para0001">The relative importance of interphase forces obtained by theoretical analysis agrees well with that calculated by numerical simulation.
id="para0002">Integral time scale for Basset force should be no smaller than the particle relaxation time.
id="para0003">Basset force and lift force are important relative to the drag force.
id="para0004">Particle transverse motion is confirmed to be the main reason for flatter particle velocity profile.