Alternative Method for Measurement of Apparent Viscosity of Gas Solid Fluidized Bed

An alternative method is used for determining the apparent viscosity of fluidized bed. For determining the apparent viscosity, the bed should be in a fluidized state therefore the knowledge of minimum fluidizing velocity is required. The solid particle that are used for bed material are Green pea (ρ=1428.57 kg/m³), coal (ρ=1538.46 kg/m³) and sand ((ρ= 2666.7 kg/m³).Air is used to fluidize the fixed bed. Before performing the experiment material have been crushed and sieved into three different sizes i.e. 2 mm, 6mm, and 8mm. The experiments are conducted in an acrylic pipe of 4 cm internal diameter having length of pipe is 100 cm. The experiments have been done for different static packed bed height 4cm. 6cm, 8cm, 10cm. During investigation apparent viscosity of fluidized bed in dense phase is determined, this is helpful for knowing the fluidity of the fluidized bed. Apparent viscosity of fluidized is determined by measuring the velocity of the thin strip inside the fluidized bed and weight required for that velocity is known. The apparent viscosity is determined for green pea (ρ=1428.57 kg/m³), coal (ρ=1538.46 kg/m³) and sand (ρ= 2666.7 kg/m³) for three different size i.e. 2 mm, 6mm, 8mm and varying the static packed bed height (4cm. 6cm, 8cm, 10cm,) during fluidized bed .It is found that apparent viscosity increases with increasing the density of the particle and size of the particle and apparent viscosity is independent of static bed height