Mean diameter of the particles present of the bottom of a channel is 5cm. If the value of chezy's constant is 80, maximum permissible velocity will be- (а) 3.1 m/s (b) 5.4 m/s (c) 2.4 m/s (d) 6.3 m/s
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- 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.)In a constant head permeameter test, the length of the specimen is 200 mm and the cross-sectionalarea is 78.5 cm2. If k = 2.1 x 10-2cm/sec, and a rate of flow of 130 cm3/min must be maintainedduring the test, what should be the head difference across the specimen?Given:True volume = 2.76 mlBulk density = 1.86 g/mlBulk mass = 3.57 gUnknown: What is the flow characteristic of the sample? What is the bulk volume of the sample? What is the Hausner ratio? What is the Compressibility Index?
- In a constant head permeameter test, the length of the specimen is 200 mm and the cross-sectional area is 78.5 cm2 . If k = 2.1 x 10-2 cm/sec, and a rate of flow of 130 cm3 /min must be maintained during the test, what should be the head difference across the specimen?How long would it take for chloride to be detected just outside the clay liner at the secondary MCL of 250mg/L? Assume diffusion is the only mechanismSand is contained in a hopper that is in the shape of an inverted circular cone. Sand flows out of the vertex ata rate of 10 m3 /min. The cone has a height of 10 m and a rope diameter of 12 m. Find the rate at which the surface level of the sand is falling when the depth of the sand is 3m above the vertex. a. The surface level of the sand is falling at a rate of 125/9pi m/min b. The surface level of the sand is falling at a rate of 125/162pi m/min c. The surface level of the sand is falling at a rate of 10/9pi m/min d. The surface level of the sand is falling at a rate of 259/81pi m/min
- A highly turbid water at 20⁰C is to be treated in a sedimentation (gravitational settling) tankwith a water depth of 3 m. The suspended particles have an average diameter of 0.03 mm and a density of 1.55 g/cm3 and the particles are fully suspended in water initially. Disregard the initial period during which the particles accelerate to their terminal velocity and assumeStokes law is applicable. Estimate: a) How long the suspended particles will take (min) to fully settle at the bottom of thesedimentation tank. b) If the sedimentation tank has to be designed to fully settle the particles in 1 hour, whatshould be the height (m) of the water level in the sedimentation tankIn a constant head permeability test, the length of the specimen is 150 mm and the cross sectional area is 1367 mm2. If k =0.062 cm/sec and a rate of flow 160cm3/min has to be maintained during the test, what should be the head differA liquid flows at a depth of 400 mm with an average velocity of 6 m/s in a rectangular channel. Determine the critical depth. a. 0.837m b. 1.428m c.2.036 d. none of the above
- The 3O HV is suitable to be used in trffic volume studies , why ?A 400 g/l solution of common salt was discharged into a stream at a constantrate of 45 l/s. At a downstream section where the salt solution is known to havecompletely mixed with the stream flow the equilibrium concentration was readas 120 ppm. If a background concentration of 20 ppm is applicable, thedischarge in the stream can be estimated to be, in m3/s, as:A rectangular sedimentation tank is designed with a depth of 3.5 mand a detention time of 1 h. Is the design suffcient to achieve complete removal of particles with a diameter of 0.01 mm? Specifc gravity of the particles is 2.65. The fow rate and temperature of waterare 10,000 m3/d and 20°C, respectively. At 20°C, density of water is998 kg/m3 and dynamic viscosity of water is 10–3 kg/m·s. State anyassumptions you make to calculate your results.