Chapter 7, Problem 7.89P

ulaglai Un le. Q3: A: In a reaction turbine, the angles of receiving tips are 35° and of discharging tips, 20°. The blade speed is 100 m/s. Calculate the tangential force, power developed, diagram efficiency, and axial thrust of the turbine, if its steam consumption is 1 kg/min. Draw the velocity diagram on scale.

Q4:- A small dam has a pipe carrying liquid water at 150 kPa, 20°C with a flow rate of 2000 k in a 0.5 m diameter pipe. The pipe runs to the bottom of the dam 15 m lower into a turbinę w pipe diameter 0.35 m. Assume no friction or heat transfer in the pipe and find the pressure Pr ab turbine inlet. If the turbine exhausts to 100 kPa with negligible kinetic energy what is the rate of work? DAM 2 Turbine 3

For a system entropy is constant if initialvolume & Pressure of a gas is 10m^3 ,7 barrespectively. Final volume is 5m^3 then find the final pressure.

4.17.) The volume of a compressible fluid system changes from V, = 1 ft³ to V2 = 5 ft3 during an internally reversible process in which the pressure varies a p = (100/V + 50) psia when V is in ft3. (a) For the process find -S Vdp and SpdV. (b) If the process is steady flow with AK = 5 Btu, AP = -2 Btu and AH = 120 Btu, find the work and heat. (c) If the process is nonflow, find W, Q and AU.

Q4) The nozzles receive steam at 1.75 MPa, 300 °C, and exit pressure of steam is 1.05 MPa. If there are 16 nozzles, find the cross-sectional area of the exit of each nozzle for a total discharge to be 280 kg/min. Assume nozzle efficiency of 90%. If the steam has velocity of 120 m/s at the entry to the nozzles, by how much would the discharge be increased?

3.43 A boiler feed pump delivers 0.05 m³/s of water at 240°C, 20 MPa. What is the mass flowrate (kg/s)? What would be the percent error if the properties of saturated liq- uid at 240°C were used in the calculation? What if the properties of saturated liquid at 20 MPa were used?

Q3. A 37-cm-diameter centrifugal pump, running at 2140 r/min with water at 20°C, produces the following performance data: Q, m³ls 0.0 0.05 0.10 0.15 0.20 0.25 0.30 Н, m 105 104 102 100 95 85 67 Р, KW 100 115 135 171 202 228 249 (a) Determine the best efficiency point. b) If we desire to use this same pump family to deliver 7000 gal/min of kerosene at 20°C at an input power of 400 kW, what pump speed (in r/min) and impeller size (in cm) are needed? What head will be developed?

An insulated diffuser accepts 0.2 kg/s of steam at 600 kPa, 325 °C. It is able to slow the flowdown such that the kinetic energy of the exit is negligible. The outgoing flow is now at 1.2 MPa, 375°C. Find the initial velocity of the flow (m/s) and the inlet area (m2) in six decimals.

Steam enters a nozzle at pressure of 1 MPa, temperature of 500 °C, and a velocity of 38 m/s and leaves as saturated vapor at 75 kPa, what is the exit velocity (m/s) when a heat loss of 19.5 kJ/kg is present?