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]11.13 A device designed to allow cleaning of walls and windows on the second floor of homes is similar to the system shown in Fig. 11.20. Determine the velocity of flow from the nozzle if the pressure at the bottom is (a)
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Applied Fluid Mechanics
- A storage reservoir supplies water to a pressure turbine under a head of 20 m. If the flow rate is 500 liters per second the head loss in the 300 mm pipe supplying the turbine is 2.5 m. Determine the pressure at the entrance of the turbine. If a negative pressure of 30 kPa exists at the 600 mm diameter section of the draft tube (exit tube) below the turbine 1.5 m below the supply line, estimate the energy absorbed by the turbine in kW neglecting losses between the entrance and exit of the pipe. Find also the output of the turbine assuming an efficiency of 85%arrow_forwardWhat is the Reynolds # of the flow.? Water @ 15C is transported from a large open tank to the bottom of another open tank above. The surfaces of the two tanks are kept at 160ft apart vertically. The pipes used have an ID of 3.5 inches, and a total length of the pipe used is 150ft. In the system, there are two fully open gate valves, 6 90° elbows, and 2 standard tees. The pump used has a mechanical efficiency of 60%, and the volumetric flow rate of water is at 35 (ft^3)/s. Assume frictional losses frm sudden contraction and expansion are negligible.arrow_forwardTwo pressurized prismatic tanks A and B are connected at their sides by an orifice 140 mm in diameter. Tank A contains water at a depth of 3 m above the orifice and a pressure of 50 kPa on the water surface. Tank B also contains water at a depth of 2 m above the orifice and a pressure of 15kPa on the water surface. The coefficient of discharge is 0.86 and the coefficient of velocity is 0.92. Detemine the: show complete solution, thumbs up guaranteed 1. What is the the head lost in the orifice? 2. What is the value of power lost?arrow_forward
- Water in a constant diameter pipe is at 15m on the inlet the pipe leads to the tank situated at a height of 10m, if the total head losses are 8m and the pip inlet and outlet are exposed to the environment and the mass flow remains constant; Chose one of the following: A. no pump is required to ensure water flows to the tank B. none of the above C. a pump needs to ensure water flows to the tank D. the water will flow through gravity to the tankarrow_forwardHint: For part (a), use conservation of energy equation (Bernoulli equation with losses) and assume the blower is just outside the control volume. Assume loss coefficients of 0.5 and 1.0 for entrance and exit, and that a plastic pipe is used (roughness = 0). Use the Colebrook or Haaland equation to approximate the friction factor. Also assume that the sum of the static pressure head and elevation head doesn't change significantly between the entrance and exit. In other words, although the elevation head will increase, the pressure head will decrease to compensate. This assumes the atmospheric pressure change is γ*Δz, which is a decent estimate for elevation changes less than ~1000 ft or so).- For part (b), use textbook equation 1.4 and assume a 100% efficient blower. Also, compare the power needed to power the blower with the world's largest non-hydro power plant in the…arrow_forwardQuestion 8 Two reservoirs are connected by a pipe whose total length is 360m.From the upper reservoir the pipe is 300mm in diameterfor a length of 150m and the remaining 210m is 450mm in diameter.The difference in water levels between the two reservoirs are 8m.Take f=0.006 for the smaller pipe and f=0.005 for the larger pipe.If all the changes in pipe sections are sharp and sudden, calculate the flow rate which can be delivered.arrow_forward
- Friction Losses and Pump Horsepower Problem:Hot water in an open storage tank at 82.2°C is being pumped at the rate of 0.379 m3/min from this storage tank. The line from the storage tank to the pump sunction is 6.1m of 2-in. schedule 40 steel pipe and it contains three elbows. The discharge line after the pump is 61 m of 2-in. pipe and contains two elbows. The water discharges to the atmosphere at a height of 6.1 m above the water level in storage tank. a. Calculate all frictional losses ƩF. b. Make a mechanical-energy balance and calculate Ws of the pump in J/kg. c. What is the kW power of the pump if its efficiency is 75%?arrow_forwardWhat power must be supplied by the pump to the flow ifwater (T =20°C) is pumped through the 300 mm steel pipefrom the lower tank to the upper one at a rate of 0.314 m^3/s?arrow_forwardIt is required to pump cooling water from storage pond to a condenser in a process plant situated 10 m above the level of the pond. 200 m of 74.2 mm i.d. pipe is available and the pump has the characteristics given below. The head loss in the condenser is equivalent to 16 velocity heads based on the flow in the 74.2 mm pipe. If the friction factor Φ = 0.003, estimate the rate of flow and the power to be supplied to the pump assuming η = 0.5 Q (m3 /s) 0.0028 0.0039 0.005 0.0056 0.0059 Δh (m) 23.2 21.3 18.9 15.2 11.0arrow_forward
- a) What would be the shaft power required to turn the impeller if the exit blade angle is 45 degrees. b) Find the major losses in the system. Take the pipe Darcy friction factor as 0.04. c) Find the minor losses in the system considering the 90 degrees elbows’ losses and the exit/entrance losses of the tanks. Consider that the exit of tank 1 is sharp-edged and take the loss coeffcient of the entrance of tank 2 as 1. d) Determine the difference in height between the water surfaces in the two tanks assuming that there are no losses within the pump.arrow_forwardA pumping system has the following characteristics, f=0.015 length of thepipe = (2500 ft) pipe diameter 6 in, losses less than 0.5, the pipeis cast iron, and the system curve is:Hp= 34+ 5.47Q2Knowing that the system curve and the pump curve intersect at 12 cfsa. Determine Operation headb. Determine dischargec. Plot the system curvearrow_forwardA header with 170 psia saturated steam is feeding a pulp stock digester through 10.8 feet of 3-inch Schedule 40 pipe which includes three standard 90 degree elbows and a fully-open standard globe valve. The initial pressure in the digester is 20 psia. a) Determine the initial flow rate in pounds per second. The specific volume of saturated steam at 170 psia is 2.674 ft3/lbm. (Please use compressable flow equations to get the correct units of Pounds per seconds.) G= Y*(2*density*deltaP/K(fittings))^1/2 b) At what digester pressure would the flow transition from sonic to subsonic?arrow_forward
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