20 m/s
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- A backward-swept centrifugal fan develops a pressure of 80 mm of water gauge. It has an impeller diameter of 0.89 m and runs at 720 rpm. The blade angle at the tip is 39° and the width of the impeller is 0.1m. Assuming a constant radial velocity of 9.15 m/s and density of air as 1.2 kg/ m3 , determine the fan efficiency, discharge and power required.A fluid moves in a steady flow manner between two sections in a flow line. At the entrance section A1 = 1m², V1= 0.5 m/s, P1= 4kgm/m³. At the exit section: A2 = 0.2m², V2= 0.20m³/kgm. Calculate the mass flow rate in kg/s and the speed at section 2 in m/s.In a wind tunnel (or a duct) that consists of a converging nozzle, a throat (constant area), and a diverging diffuser, where does the flow separation occur? What is the reason for this flow separation?
- A jet of water with velocity 35 m/s strikes a series of radial curved vane mounted on a wheel which is rotating at 200 rpm. The jet makes an angle 30° with the tangent to the wheel at inlet, and leaves the wheel with a velocity 5 m/s at angle of 140° to the tangent to the wheel at the outlet. The outer and inner radii of the wheel are 70 cm and 35 cm, respectively. A. Determine the Inlet Vane Angle, in degrees.A jet of water with velocity 35 m/s strikes a series of radial curved vane mounted on a wheel which is rotating at 200 rpm. The jet makes an angle 30° with the tangent to the wheel at inlet, and leaves the wheel with a velocity 5 m/s at angle of 140° to the tangent to the wheel at the outlet. The outer and inner radii of the wheel are 70 cm and 35 cm, respectively.Explain the work of Nozzles and diffusers are shaped so that they cause large changes in fluid velocities and thus kinetic energies.
- Fluid of constant density is flowing at a velocity of 0.5 meter per second into a horizontal nozzle of decreasing cross-section. The velocity of water ,in meter per second, going out of the nozzle if the diameter at the exit point is 1/3 the diameter in the entry point isOrange juice is flowing through a horizontal U-type reducing bend at a rate of 36kg/s. The cross-sectional area, gage pressure, and velocity are 168cm^2, 57.5 kPa, and 2.10 m/s at the inlet, and 80cm^2, 50kPa, and 4.37 m/s at the outlet. Calculate the force applied to the reducing bend by the orange juice in the horizontal directionBlowers are used in wastewater treatment plants to assist microorganisms in degrading pollutants. The impeller of a centrifugal blower has a radius of 15 cm and a blade width of 6.1 cm at the inlet, and a radius of 30 cm and a blade width of 3.4 cm at the outlet. The blower delivers atmospheric air at 20°C and 95 kPa. Disregarding any losses and assuming the tangential components of air velocity at the inlet and the outlet to be equal to the impeller velocity at respective locations, determine the volumetric flow rate of air when the rotational speed of the shaft is 800 rpm and the power consumption of the blower is 120 W. Also determine the normal components of velocity at the inlet and outlet of the impeller.
- A jet of water with velocity 35 m/s strikes a series of radial curved vane mounted on a wheel which is rotating at 200 rpm. The jet makes an angle 30° with the tangent to the wheel at inlet, and leaves the wheel with a velocity 5 m/s at angle of 140° to the tangent to the wheel at the outlet. The outer and inner radii of the wheel are 70 cm and 35 cm, respectively. A. Determine the Inlet Vane Angle, in degrees. B. Determine the Outlet Vane Angle, in degrees. C. Determine the work done per unit weight of water, in Newton-Meter per Newton.A hydroelectric power plant uses Pelton-type turbines, in which multiple nozzles are used to accelerate the waterwhich is directed onto the turbine blades, which are exposed to an atmospheric pressure of 101.325 kPa. The water enters the nozzles with an absolute pressure of 500 kPa and a speed of 5 m/s, and the nozzle outlets are exposed to atmospheric pressure and have an internal diameter of 5 cm. Consider that the specific mass of water is 1,000 kg/m3. Determine the mass flow rate of water through each of the nozzles, and explain why the actual mass flow rate will be lower.Calculate the diameter of the nozzle (in mm) by a jet of water discharging freely out of a nozzle, fitted to a pipe 300 m long and 100 mm diameter with coefficient of friction as 0·01. The available head at the nozzle is 90 m. a. 372 b. 33 c. 25.4 d. 10.29