Spend about 20-30 minutes to work through the example below: Catalyst pellets were hydrodynamically tested in the laboratory, firstly with air and subsequently with water, using downward flow through a fixed bed of depth 8.0cm. At a superficial velocity of 0.3ms1 the air gave a pressure loss of 0.11kNm2. At a superficial velocity of 0.1ms1, the water gave a loss of 4.7kNm2, From these observations, estinate the pressure loss which will occur in a fixed bed reactor using identical catalyst pellets if the bed is to be 1.5m deep, 12cm in diameter and is to be used under the given conditions: The pressure loss in the fxed bed is given by P=aLu+bLu2 Where a and b are constants that only depend on the voldage and the specific surface area of the packed bed Numerical answer: a=7.65107b=5.19103P=231kPa