1 A Flat Turbine Agitator With A Disk Having Six Blades Is Installed In A Tank The T 2811351

1. .A flat turbine agitator with a disk having six blades is installed in a tank. The tank diameter is1.83 m, the turbine diameter is 0.61 m, Dt = H, and the width W is 0.122 m. The tank contains four baffles, each having a width of J = 0.15 m. The turbine is operated at 90 rpm and the liquid in the tank has a viscosity of 10 cps and a density of 929 kg/m3. It is desired to design a small pilot plant unit with a vessel volume of 2 L so that the effects of various process variables on the system can be studied in the laboratory. The rates of mass transfer appear to be important in this system, so the scale down should be on this basis. Design the new system specifying sizes, rpm and power.
2.An ideal gas flows isetropically through a converging-diverging nozzle. At a section in the converging portion of the nozzle, A1= 0.1 m2, p1= 600 kPa (abs), T1= 20 ? C, and Ma1 = 0.6. For section (2) in the diverging part of the nozzle, determine A2, p2 and T2 if Ma2 = 3 and the gas is air.
3.Air is injected into a 50 m long horizontal pipeline (of 42 mm diameter) carrying a clay slurry of density 1452 kg/m 3. The rheological behaviour of the slurry follows the power-law model, with m = 5.55 Pa sn and n = 0.35. The volumetric flow rates of air and liquid are 7.48 and 1.75 m3/h, respectively. The air is introduced into the pipeline at 20°C and at a pressure of 1.2 bar. Ascertain the flow pattern occurring in the pipeline. Estimate (a) the average liquid holdup at the midpoint, (b) the pressure gradient for the two phase flow, (c) the maximum achievable drag reduction and the air velocity to accomplish it.

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