Hydroponic garden uses the 10-m-long perforated pipe system in Figure 1 to deliver water at 20°C. The pipe is 5 cm in diameter and contains a circular hole every 20 cm. A pump delivers water at 75 kPa (gage) at the entrance, while the other end of the pipe is closed. You know that the pressure near the closed end of a perforated "manifold" is surprisingly high, and there will be too much flow through the holes near that end. One remedy is to vary the hole size along the pipe axis. Make a design analysis, perhaps using a personal computer, to pick the optimum hole size distribution that will make the discharge flow rate as uniform as possible along the pipe axis. You are constrained to pick hole sizes that correspond only to commercial (numbered) metric drill-bit sizes available to the typical machine shop. 20 cm 10 m Figure 1 Pump

Hydroponic garden uses the 10-m-long perforated pipe system in Figure 1 to deliver water at 20°C. The pipe is 5 cm in diameter and contains a circular hole every 20 cm. A pump delivers water at 75 kPa (gage) at the entrance, while the other end of the pipe is closed. You know that the pressure near the closed end of a perforated "manifold" is surprisingly high, and there will be too much flow through the holes near that end. One remedy is to vary the hole size along the pipe axis. Make a design analysis, perhaps using a personal computer, to pick the optimum hole size distribution that will make the discharge flow rate as uniform as possible along the pipe axis. You are constrained to pick hole sizes that correspond only to commercial (numbered) metric drill-bit sizes available to the typical machine shop. 20 cm 10 m Figure 1 Pump

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

115 m turbine 2 In the above example problem, a hydroelectric turbine at the base of a dam is shown schematically. The height of the water above the turbine station given as 115 m. This turbine produces 4.6 MW of electricity, and you may assume the losses in the system to be equivalent to 10 m of head of water. The diameter of the pipe at the turbine exit is 0.75 m, and the velocity of water exiting from the pipe is 12.5 m/s. Caleulate the efficiency of the turbine.
A centrifugal pump driven by a 120-kW motor rotating at 2400 rpm is used to pump 20°C water in a manufacturing plant. The pump operates against a head of 30 m and has an efficiency of 70%. If this pump is situated 9 m below the level of the source, calculate (Zs)max and determine if the pump is safe from cavitation. Select one: O a. -7.9 m; NOT SAFE O b. -9.7 m; NOT SAFE O c. -7.9 m; SAFE O d. -9.7 m; SAFE
(b) Figure Q2(b) shows water at 25°C flows through a 60 mm diameter 30 m long galvanized iron pipe from a tank. The pump power is 40 kW and its efficiency is 80%. If the water flows at 0.046 m³/s, determine the height difference between the level of water in the tank and the nozzle. Neglect the minor losses that occur in the piping system. 60-mm-diameter, 30-m-long pipe; 40-mm-diameter nozzle Pump Figure Q2(b)
Water from a reservoir is pumped over a hill through a pipe 3 ft. in diameter, and a pressure of 35 psi is maintained at the summit, where the pipe is 300 ft above the reservoir. The quantity pumped is 55 cfs, and by reason of friction in the pump pipe there is 10 ft of head loss between the reservoir and the summit. What amount of energy must be furnished the water by the pump in kilowatts?
A square bottomed tank measures 25*25*160cm and is positioned with the bottom of the tank 1m above sea level and at 20degreesC. The tank is 90% filled with water and 10% air. A water inlet enters the centre of the tank of 10mm diameter, and no other inlet or outlet is open within the tank. A pump drives water at a starting rate of 450ml/min at 0 Pa lowering to 350ml/min as the pressure increases to 800 kPa. The pump and tank are connected by a 10mm diameter pipe with k=0.15 for all fittings and tubing. It should be assumed this is the maximum flow and pressure provided by the pump. The pump will stop instantaneously once the pressure reaches 800kPa. The relationship between flow and pressure from the pump should be assumed linear. What will be the volume of compressed air inside the tank and how long will it take to fill?
Blood flow from the left ventricle into the aorta can be modcled as a reducing nozzle. Model both the left ventricle and the aorta as a horizontal tube with diameter of 3.1 and 27 cm, respectively. The pressure in the left ventricle is 130 mmHg and the pressure in the norta is 123 mmHg. Calculate the flow rate of the blood. (Poiood = 1060 kgm-) %3D
A liquid food (density = 1200 kg/m³, viscosity = 0.07 Pa s) is to be pumped from an open constant level reservoir (that has a fluid level of 2 m) to another open tank, with the discharge point of the pipe to the second reservoir being 7 m above the level of the fluid in the first constant level reservoir. The liquid is to be pumped via a steel pipeline system at the rate of 40 gallons per minute. The pipeline system consists of a 4-in. nominal diameter suction pipe that is 20 m long and has a fully open diaphragm valve in it while the discharge pipe is a 1-in. nominal diameter pipe that is 30 m long and has two 90 regular threaded elbows in it. Assuming a pump efficiency of 75%, what should be the rating of the pump to accomplish this task?
In the figure below, assume the pipe from B to C has a diameter of 4-inches, (f = 0.035), and length of 18-feet. The pipe from DE is 187-feet, has a diameter of 4-inches and friction factor of 0.035. The Az = 69-feet. The elevation of C is 14-feet above the lower water surface. If the pressure head @ C is to be no less than (-) 20 feet, and the pump has 63% efficiency, what horsepower must be supplied to the pump in order to convey flow through the system? (Kent = 0.8) Assume a submerged exit. Az
On a trip to the beach (Patm 1 atm or 101.3 kPa), a car runs out of gasoline and it is necessary to siphon gasoline from a Good Samaritan's car. The siphon is a hose with a small diameter and to start the action it is necessary to insert one end into the tank full of gasoline, fill the hose with it through suction and then put the other end in a can that is placed under the tank level. The difference in pressure between point 1 (on the free surface of the gasoline in the tank) and point 2 (at the outlet of the tube) causes the liquid to flow from the highest elevation to the lowest. In this case, point 2 is located 0.75 m below point 1, and point 3 is 2 m above 1. The siphon diameter is 4 mm and friction losses in it must be ruled out. Determine: a) theminimum time to bring 4 L of gasoline from the tank to the can and b) the pressure at point 3. The density of the gasoline is 750 kg / m3.
Tank 1 Tank 2 g Question 1 Consider the flow of water (p= 10³ kg/m³, u = 10³ Pa-s) from tank 1 to tank 2. A centrifugal pump is installed in this piping system with length L = 300 m and diameter D = 40 cm cast-iron pipe. The water surface of tank 1 is 15 m higher than the water surface of tank 2. You may neglect minor losses but not major losses. The gravity cannot be neglected. Assume steady-state and no friction in the tanks. (a) Simplify the equation of the system curve Ap vs Q. Do not place numerical data. (b) Plot the system curve Ap vs Q (0 ≤Q≤2 m³/s). (c) Find the volumetric flow rate when the pump is not operating. (d) Find the power supplied to the water and to the pump if n = 0.9 and 1 m³/s. (e) Consider a pump: Ap = 106 105 Q², where Ap in Pa and Q in m³/s. Find the operating point. What is the minimum and maximum volumetric flow rate that this pump can deliver?