452
7 Applications: Pebble Flow Optimizations
Fig. 7.7 The E m of near-wall region in different bed configurations
Fig. 7.8 Wall-sticking velocity at x=0.02m in different beds
Wall-sticking velocity, or adherent velocity, is also a critical parameter in pebble flow. The adherent pebbles move against the wall and, meanwhile, affect other
pebbles’ behavior in the near-wall region by transferring force and voids, playing a
critical role in connecting wall and pebbles. Those wall structures which can provide
a high wall-sticking velocity are less likely to form stable force chains [3] or structured packing, because shear force resulting from relative motion is strong enough to
destroy them. From this perspective, in Fig. 7.8 “sawtooth_12” is the right choice that
allows adherent pebbles to flow downward with less resistance and reach a relatively
7 Applications: Pebble Flow Optimizations
Fig. 7.7 The E m of near-wall region in different bed configurations
Fig. 7.8 Wall-sticking velocity at x=0.02m in different beds
Wall-sticking velocity, or adherent velocity, is also a critical parameter in pebble flow. The adherent pebbles move against the wall and, meanwhile, affect other
pebbles’ behavior in the near-wall region by transferring force and voids, playing a
critical role in connecting wall and pebbles. Those wall structures which can provide
a high wall-sticking velocity are less likely to form stable force chains [3] or structured packing, because shear force resulting from relative motion is strong enough to
destroy them. From this perspective, in Fig. 7.8 “sawtooth_12” is the right choice that
allows adherent pebbles to flow downward with less resistance and reach a relatively