Chapter 7, Problem 7.153EP

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Gas flowing through a diverging nozzle has at inlet section a temperature of 20 °C, pressure 120 kN/m? and velocity 300 m/s. At the outlet of the nozzle the velocity has fallen to 100 m/s. Assuming an adiabatic flow, what is the values of outlet pressure, temperature, internal energy and specific enthalpy at outlet section. Take y = 1.333 and Cv= 0.86 kJ/kg K.

A=1

8. Figure shows that water leaving a container. What is the exit velocity of the water? (1) D=1.0m |=2.0m d= 0.10 m

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Two gases enter a combining tube and leave as a single mixture. . For the first gas, A₁=72in² V₁=205m/s V₁=120gal/lbm . For the other gas, A₂=48in² m2=20lbm/s P2=2kgm/m³ ● . At the exit, V3=320ft/s V2=9ft³/lbm Find the (a) velocity at section 2 in m/s, (b) mass flow rate at the exit section in kgm/s, and (c) area at the exit section in m².

The inlet pressure to a piping system is 440 kPa. The inlet pipe diameter is 0.6 m. What is the velocity of the flow of water and discharge at the inlet?

1- In c-d nozzle, after the throat the relation between the velocity of air flow (1) and area (1) is given by: V-100+2012. This means that the flow at exit is.... (A) Sonic (B) subsonic (C) supersonic (D) not specified 2- After the expansion waves, the quantity that decreases is the: (A) Density (B) stagnation pressure (C) Mach number (D) (A) and (C) 3- For a converging nozzle, when the assumed critical pressure (p) is greater than the ambient pressure, the nozzle is: (A) Mc <1 (B) McI (C) chocked (D) (A) and (C) 4- The stagnation temperature To remains constant across the shock wave because To represents.... (A) thermal energy (B) total energy (C) kinetic energy 5- The expansion waves are a series of ...... expansion processes. (A) isothermal (B) adiabatic (C) isentropic 6- For a flow through a c-d nozzle, when the flow is maximum, then the critical arca (A*) is (A) equal to throat area (B) greater than throat area (C) less than the throat area 7- Over a convex corner, the most…

(b) Air flows through a cylindrical duct at a rate of 2.3 kg/s. Friction between air and the duct and friction within air can be neglected. The diameter of the duct is 10cm and the air temperature and pressure at the inlet are T₁ 450 K and P₁ = 200 kPa. If the Mach number at the exit is Ma2 determine the rate of heat transfer and the pressure difference across the duct. The constant pressure specific heat of air is cp = 1.005 kJ/kg-K. The gas constant of air is R = 0.287 kJ/kg-K and assume k = 1.4. -