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You are watering your lawn with an old hose. Because lime deposits have built up over the years, the 0.75-in.-ID. hose now has an average roughness height of 0.022 in. One 50-ft length of the hose, attached to your spigot, delivers 15 gpm of water (60°F). Compute the pressure at the spigot, in psi. Estimate the delivery if two 50-ft lengths of the hose are connected. Assume that the pressure at the spigot varies with flow rate and the water main pressure remains constant at 50 psig.
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Fox and McDonald's Introduction to Fluid Mechanics
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- B1. A water with viscosity 11.4x103 poise is flowing through a pipe of diameter 300 mm at the rate of 375 litres per sec. Find the Reynold's Number & the head lost due to friction in the pipe of length 1.5 km. The velocity of flow of water (in m/s) is The value of Reynold's Number is The frictional loss in the pipe (in m) isarrow_forwardShow complete solution and formulas used. Show the schematic diagram too. Calculate the required pipe diameter to avoid cavitation, if the pump delivers Q = 30US gallon/min water from a closed tank, where the pressure (above the water level) is p = 40kPa. The equivalent length of the smoothened concrete pipe on the suction side is 12m while the suction flange of the pump is 8m below the water level. The vapour pressure at the given water temperature is 2.8kPa. The required net positive suction head is NPSHr = 3.2m.arrow_forwardC2. A conical tube is fixed vertically with its smaller end upwards and it forms a part of the pipeline. The diameter at the smaller end is 245 mm and at the larger end is 467 mm. The length of the conical tube is 1.8 m and the flow rate of the oil is 128 liters/s. The pressure at the smaller end is equivalent to a head of 9.7 m of oil. Considering the following two cases: (1) Neglecting friction, (without head loss) determine (i) the velocity at the smaller end in m/s, (ii) the velocity at the larger end in m/s, and (iii) the pressure at the larger end of the tube. (2) If a head loss (with head loss) in the tube is hL= 0.0153(V1-V2)2, where V1 is the velocity at the smaller end and V2 is the velocity at the larger end, determine (iv) the head loss in m of oil and (v) the pressure at the larger end of the tube.arrow_forward
- 5. Oil of specific gravity 0.750 is pumped from a tank over a hill through a 24′′ pipe with the pressure at the top of the hill maintained at 25.5 psi. The summit is 250 ft above the surface of the oil in the tank, and oil is pumped at the rate of 22.0 cfs. If the lost head from tank to summit is 15.7 ft, what horsepower must the pump supply to the liquid? indicate free body diagramarrow_forwardThe ethanol solution is pumped into a vessel 25 m above the reference point through a 25 mm diameter steel pipe at a rate of 8 m3 / hr. The pipe length is 40 m and there are 2 elbows. Calculate the power requirements of the pump. The properties of the solution are density 975 kg / m3 and viscosity 4x 10-4 Pa s. a. Reynold number = Answer. b. Loss of Energy along the straight pipe = Answer J / kg. c. Energy Loss at curves = Answer J / kg. d. Total energy to overcome friction = Answer J / kg. e. Energy to increase water according to height = Answer J / kg. f. The theoretical energy requirement for the pump is kg ethanol / second = Answer J / kg. g. Actual pump power requirement = Answer watt.arrow_forwardThe ethanol solution is pumped into a vessel 25 m above the reference point through a 25 mm diameter steel pipe at a rate of 8 m3/hour. The length of the pipe is 35m and there are 2 elbows. Calculate the pump power requirement. The properties of the solution are density 975 kg/m3 and viscosity 4x 10-4 Pa s. a. Reynolds number = b. Energy Loss along a straight pipe = J/kg. c. Energy Loss in turns = J/kg. d. Total energy to overcome friction = J/kg. e. Energy to raise water to height = J/kg. f. Theoretical energy requirement of the pump kg ethanol/second = J/kg. g. Actual pump power requirement = watt.arrow_forward
- The ethanol solution is pumped into a vessel 25 m above the reference point through a 25 mm diameter steel pipe at a rate of 8 m3 / hr. The pipe length is 40 m and there are 2 elbows. Calculate the power requirements of the pump. The properties of the solution are density 975 kg / m3 and viscosity 4x 10-4 Pa s. a. Reynold number = Answer. b. Loss of Energy along the straight pipe = AnswerJ / kg. c. Losing Energy at curves = AnswerJ / kg. d. Total energy to overcome friction = AnswerJ / kg. e. Energy to increase water according to height = AnswerJ / kg. f. The theoretical energy requirement of the pump ethanol / second = AnswerJ / kg. g. Actual pump power requirement = Answerwatt.arrow_forwardB1. A water with viscosity 11.4x10-3 poise is flowing through a pipe of diameter 300 mm at the rate of 500 litres per sec. Find the Reynold's Number & the head lost due to friction in the pipe of length 1 km. (Enter only the values by referring the unit given. Also upload the hand written answers in the link provided) The velocity of flow of water (in m/s) is The value of Reynold's Number is The frictional loss in the pipe (in m) isarrow_forwardWater is pumped through a vertical 2-in. new galvanized-iron pipe to an elevated tank on the roof of a building. The pressure on the discharge side of the pump is 200 lb per sq in. What pressure can be expected at a point in the pipe 250 ft above the pump when the flow is 150 gpm? Answer should be: 37 lb per sq. inch Show your handwritten solution, thank you.arrow_forward
- Q2- A (0.14 m/s) oil has (density 880 kg/m³ & viscosity 0.026 pa.s) is pumping from first tank to second tank by using centrifugal pump and discharge pipeline 12 inch in diameter. If the pipe roughness is 0.045mm: 1- Calculate pipe frictional head loss for discharge pipe 6100m in length. 2- Calculate pump liquid power if oil level in first tank 7 m, the oil level in second tank is 14 m, and the suction pipe length is 53 m and diameter is 14 inch.arrow_forwardQ2- A (0.14 m/s) oil has (density 880 kg/m & viscosity 0.026 pa.s) is pumping from first tank to second tank by using centrifugal pump and discharge pipeline 14 inch in diameter. If the pipe roughness is 0.045mm: 1- Calculate pipe frictional head loss for discharge pipe 6100m in length. 2- Calculate pump liquid power if oil level in first tank 7 m, the oil level in second tank is 14 m, and the suction pipe length is 55 m and diameter is 16 inch.arrow_forwardEx. 2.11 A pump delivering 230 Ips of water whose absolute viscosity is 0.0114 Poise has a 300-mm diameter suction pipe and a 254-mm diameter discharge pipe as shown in the figure below. The suction pipe is 3.5 m long and the discharge pipe is 23 m long. The water is delivered 16 m above the intake water level. Considering the head losses in fittings and valves, find the head which the pump must supply. If the motor brake power of the driving motor is 75 kW, what is the efficiency of the pump? Assume the pipe material as cast iron. Given: A figure showing a pumping installation Q= 230 Ips D = 300 mm D = 254 mm H = 0.0114 Poise = 0.00114 Pa-s BP = 75 kW %3D %3D Standard elbow Standard elbow Discharge reservoir Long sweep elbow z=z, +2, Pump Source Foot valve & strainer Required: a) The total dynamic head b) The pump efficiency wilz,arrow_forward
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