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1. A dual filter consists of two layers of granular material, with one layer on top of the other. The dual filter is made

  

1. A dual filter consists of two layers of granular material, with one layer on top of the other. The dual filter is made of a 1.5 ft thick layer of 1-mm coal particles, with sphericity=0.73 and porosity=0.50, placed above another layer, 1 ft thick, of 0.5-mm sand particles, with sphericity=0.82 and porosity=0.40. Determine the water superficial velocity through the filter if the (initial) total allowable pressure drop across the filter is 0.5 psi (3.45 kN/m2). Water has a density and viscosity of 1000 kg/m and 1 cp, respectively. 2. Data for the filtration of a slurry in water at 298 K (25 C) are reported in the table below for a plate-and-frame filter press at a constant pressure (AP) of 46.2 kN/m (6.70 psia). The filtration area was 0.0439 m (0.473 ft) and the slurry concentration was 23.47 kg solid/m filtrate. Calculate a and Rm. V (m) 0.50x10-3 t (s) 17.30 1.0010-3 41.30 t (s) V (m) 1.50x10-3 72.00 2.0010-3 108.30 V (m) 2.50x10-3 3.0010- t (s) 152.00 201.70

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