$13.$ True$/$False: Particle size does not affect the operation of fluidized bed reactors.

$14.$ True$/$False: In pneumatic conveying, the solid loading ratio is defined as the mass flow rate of air to the mass flow rate of solids.

$15.$ True$/$False: Mini channels do not impact the parameters of the drift flux model due to their size.

$16.$ True$/$False: Accounting for the interactions between all three phases is unnecessary when modeling three$-$phase flows.