The interphase momentum exchange coefficient play an important role in formulating the mathematical description of Circulating Fluidized-Bed (CFB) system. The present study provides a theoretical and numerical investigation and its effects on various parameters. The relevancy of evaluation of interphase momentum transfer and its effect on the voidage profile is discussed. The analyzed numerical result provides a broader perspective for the range of variation Of Computed data. The results are very near to reality.