Question: Question 3 for A=45.25;B=4.75;C=7.35;D=115.5;E=19.5 Consider an ideal rectangular tank for removing spherical particles from water. The fluid velocity is uniform and horizontal throughout the settling

Question 3 for A=45.25;B=4.75;C=7.35;D=115.5;E=19.5 Consider an ideal rectangular tank for removing spherical particles from water. The fluid velocity is uniform and horizontal throughout the settling region. a. For the data given below, calculate the minimum length of the tank that would remove Am diameter particles with 100 percent efficiency. State any assumptions made. Height of settling zone, H=Bm Width of the settling zone, W=Cm Water flowrate through the tank, Q=Dm3/h b. What is the hydraulic residence time for this tank? c. Calculate the theoretical removal efficiency for particles of diameter " A7.5 " and " A15.0 " m in this tank. If E% of the mass of particles is in each of the size class " A7.5 " and " A15.0m and the rest of the particles have a diameter of at least Am, what is the overall mass removal efficiency? d. If the height of the tank were doubled, for the same flowrate of water, how would the settling efficiency be affected in parts a) and c)? Given: - Density of the particles =3.15g/cm3 - Density of water =0.9991g/cm3 - Dynamic viscosity of water =0.01185g/(cmsec) - Gravitational acceleration =9.807m/sec2

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