Air with density of 1.22 kg/ m^3, viscosity of 1.9x10^-5 pa.s is flowing in a fixed bed of a diameter .5 m and length 3 m. The bed is packed with spherical particles of dia 8 mm . The void fraction is .5 . The air mass flow rate is .8 kg/s . Calculate pressure from if fluid is having spherical velocity of 2.5m/s . Take spherical value as 1.