Sand particles (SG = 2.7), approximately spherical with diameters from 100 to 250 m, are introduced into an upward-flowing stream of water at 20μC. What is the minimum water velocity that will carry all the sand particles upward?

A drainage pipe beneath a dam has clogged with sand whose coefficient ofpermeability is found to be 8.0 meters per day. The average difference inheadwater and tailwater elevation is 21.6 meters and it has been observed thatthere is a flow of 162 liters per day through the pipe. The pipe is 96.3 meterslong and has a cross-section area of 180 sq. cm. What length of the pipe isfilled with sand?

A setlling chamber is used to remove sand and grit from the influent water to a wastewater treatment plant. Conditions are: Chamber Height = 3m Chamber Width = 2m Chamber Length = 7m Water Flow Rate = 0.5m3/min Particle Density = 2.65g/cm3 a) What is the minimum settling velocity required for a particle to be required for a particle to be removed by this setlling chamber? Express your answer in units of cm s-1. b) Assume that this or another setlling chamber removes all particles having settling velocities greater or equal to 0.04 cm s-1. What is the minimum particle diameter that would b e entirely removed by such a setlling chamber? Express your answer in units of micrometers.  (For part (b), assume the particle being removed is approximately spherical, and the water is at 22°C (density = 997.7 kg/m3, dynamic viscosity = 0.957x10-3 kgm-1s-1). If you use Stoke’s law as part of your solution, be sure to use the Reynolds number to confirm you are in the laminar flow range.)

Question 25 In laminar flow, which is correct? BJ: higher Re value has higher friction factor JB: lower Re value has higher friction factor BJ is true and JB is true BJ is false and JB is false BJ is false and JB is true O BJ is true and JB is false