This paper deals with an experimental study on hydrodynamics of 200 um, 300 um and 400 um silica sand in a circulating fluidized bed (CFB) setup having its riser diameter and height of 0.108 meter and 7 meters, respectively. By increasing the primary air velocity from 5.16 to 6.67 m/s and with three values of total solid inventory (i.e 20 kg, 25 kg and 30kg), solid circulation rate of solid particles was experimentally estimated to be in the order of from 3.59 to 42.67 kg/m2s. A mathematical correlation was then developed that helps predict solid circulation rate as a function of primary air velocity, aeration air velocity, particle size and total solid inventory of the CFB.