Q.2. Calculate the long and height dimensions of a gravitational settling chamber for a gas velocity in the collector with (1m/sec).(50%) cutoff diameter particles of (4.47x 10-5 m) of ( Cao) suspended in air stream at (100° c) at atmospheric pressure. Where particles density is (3310 kg/m³ )and dynamic viscosity for air is (2.17x 10-5 kg/m.sec).

2- Find an expression for the average velocity in a smooth pipe if it depends on the viscosity, the diameter, and the pressure gradient dp/dx.

6. Crude oil of relative density 0.91 (viscosity 1.24 poise) is pumped through a supply pipeline 75 mm diameter, where a flow of 420 litres/min takes place between pipeline section 1.25 km from the feeder reservoir, and section 1.60 km from the feeder reservoir. A piezometer records a pressure of 12425 Pa at the section D. Taking head loss due to friction into consideration as per viscous flow or turbulent flow prevailing, evaluate the pressure head at section 2.

Consider particles in suspension and their settling behaviour at different concentrations select the correct statement(s). Type 1 settling is called discrete settling. Your option is Correct B Terminal velocity in suspension is achieved when drag force is balanced by gravity force. Your answer is IN-CORRECT Correct Option 24 In Type 1 settling, for Ree(100, 300) Cn = Re 3 +0.34 (Re = Reynold's number) VRe D In Type 2 settling, the velocity of floc does not remain terminal and keeps changing as the size of the floc changes. Your option is Correct