Problem 2. A reverse osmosis membrane has a kw values of 2.5-10 L/(m²-s-bar) and an average ks value of 3.5.10+ L/(m²-s). Find the expected permeate salt concentration of chloride if the feed concentration is 4500 mg/L, the system operates at a gauge pressure of 35 bar on the feed side of the membrane, and 95%. Assume the permeate has a negligible osmotic pressure. Answer: 171 mg/L.
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- A liquid has a relative density of 0.8 and a kinematic viscosity of 2.3 centistoke. Deterimineits: (i) Weight density and (ii) Dynamic viscosity in Pa.sec 2:A ground water with salinity (TDS) of 2850 mg/L is treated with reverse osmosis desalination process for drinking water production and the permeate salinity (TDS) is measured to be 200 mg/L. The feed flow rate and permeate flow rate of the membrane process are 4000m³/d and 3200m³/d, respectively. It is known the resistance of the membrane Rm is 10¹¹ Pa-s/m and the driving pressure AP is 10 bar. The osmotic pressure of the water can be determined by the rule of thumb (psi) = 0.01 TDS (mg/L). Determine (1) the required salt rejection rate of the membrane, (2) the recovery of the RO process, (3) the permeate flux through the membrane and the required membrane area, (4) the flow rate and salinity (TDS) of the concentrate flow.Example 2: NaCl equivalent concentration 20,000 ppm. Temperature of %3D concentration 75°F. Find the Resistivity of the solution.
- 1. When the force of 3 mN is applied to the plate the line AB in the liquid remains straight and has a velocity of 0.6x103 m/s. If the surface area of the plate in contact with the liquid is 0.6 m?, determine the approximate viscosity of the liquid. B B B' 3 mN 4 mm A1. When the force of 3 mN is applied to the plate the line AB in the liquid remains straight and has a velocity of 0.6x10-3 m/s. If the surface area of the plate in contact with the liquid is 0.6 m2, determine the approximate viscosity of the liquid. В B' 3 mN 4 mm AQ2: Determine the resultant about the point O of the four forces and one couple which act on the plate shown in the Figure below. Note : for the resutant of 3osihys Forc es, You should computy the magnitude Kdirechion 30N 5 m- 3 ocos4s 25N 2 m 70 N-m 20N 40N o 30
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