Abstract: - Importance of noncylindrical fluidized bed for process operation has been emphasized.. The correlations and the models developed for gas-solid fluidized bed in noncylindrical conduits (square, Hexagonal, semi cylindrical and conical) as compared with cylindrical, with a special focus on the development during the last two decades.Limited investigation have been carried out in noncylindrical bed hence emphasis is given to recent investigation on hydrodynamics study in noncylindricalconduits,while dynamics for cylindrical bes have been exhaustively studied by different authors. Available studies relating to hydrodynamic properties viz. minimum fluidization velocity, bed pressure drop, bed expansion and fluctuation, bubbling and slugging velocity, bubbling and fluidizing index in non-cylindrical conduits have been detailed. The gray areas in non-cylindrical column hydrodynamics for future studies have been identified and potential application of such column have been suggested.