AIR ISOTHERMAL FLOW-THROUGH PACKED-BEDS

The experimental study of the air how through a packed bed has been do ne under working conditions close to those used in the case of drying. The measuring of the local velocities has been done for long beds (L/ D > 1), high dimensions pellets (d > 5 mm) and in the domain of interm ediate how (Re = 100-400). To correlate the obtained results there has been used as dimensionless velocity the ratio between the local veloc ity of the air inside the bed and the local velocity of the air in the empty column. The deduced equations have shown that the velocities di stribution is influenced by the Re number, the D/d ratio and the L/d r atio. (C) 1998 Elsevier Science Inc. All rights reserved.