Air enters an adiabatic nozzle at 230 kPa, 600°C with a velocity of 60 m/s. The air is at70 kPa, 450°C at the exit of the nozzle. Model the air as an ideal gas having variablespecific heat, using values from Cengel's tables posted on Canvas.a) Find the exit velocity of the air (answer: 577.1 m/s).b) Find the isentropic efficiency of the nozzle (answer: 0.643).

A nozzle is a smooth-varying cross-sectional channel that converts working fluid pressure energy…

Answered: Air enters an adiabatic nozzle at 230…

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

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Problem 3): Steam flows through an adiabatic turbine at a 10 kg/s steady rate, entering the turbine at 4 MPa, 500°C, and 70 m/s. The steam leaves the turbine at 30 kPa, 40 m/s and with an enthalpy of 2438 kJ/kg. Calculate: a) The phase and specific volume of the steam at the turbine exit. b) The power generated by the turbine. c) The cross-sectional area at the turbine exit. d) The rate of entropy change of the steam during this process.
Q5) 1 kg of AIR at P = 100 kPa is contained in a RIGID TANK made of IRON of mass 0.5 kg. Initially, the temperature of both the AIR and the TANK are 25°C. a) Now, the TANK (air and the iron) is heated by an electric heater of power 100 W for 30 min. Calculate the entropy generation Sep, during the heating process. (Heat loss to the surrounding is prevented during this process.) Iron-0.5 kg 1 kg Air Electric Heater |b) Next, the tank is left to cool down in a VERY BIG room at T = 25°C. Calculate the total entropy generated Suen [kJ/K] (both in the system and in the surrounding) during the cooling of the tank.
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This is an Isothermal Compression of Ammonia [not an ideal gas] Ammonia in a piston-cylinder device initially at 700kPa, 303K undergoes a reversible isothermal compression process until the volume is reduced to 25% of the initial volume. a) Draw the process T-s and p-v-diagrams, relative to saturation lines. b) What is the heat and work per unit mass?
1. Assume 1 kg of steam expand isentropically from 2 MPa and 360°C to 0.040 MPa. Find: a) work for non-flow b) work for steady flow If the steam expands to same exhaust pressure and at 100°C, find: c) actual work for non-flow system
Two kg water at 95°C with a quality of 40% has its temperature raised 15°C in a constant volume process. What is the new specific entropy? Select one: a. 3.618 kJ/kg K b. 4.015 kJ/kg K c. 6.747 kJ/kg K d. 5.232 kJ/kg K
P.S write in detailed solution
4*. Steam at 2 MPa and 450° C enters an isentropic nozzle with a velocity of 10 m/s and exits at 1.5 MPa. The mass flow rate is 0.2 kg/s. Calculate: a) The exit temperature. b) The velocity of the steam at the exit of the nozzle. c) The area at the exit of the nozzle.
Steam is expanded isentropically in a turbine from 800 kPa, 250 °C to 200 kPa. How much work is done in this process per kg of water?
2. A steady stream of steam passes through a turbine. The steam inlet conditions are 10MPa, 450°C and 80m/s and at the outlet they are 10kPa, 92% quality and 50m/s. The mass flow of the steam is 12 kg/s. Determine a) the change in kinetic energy, b) the power developed by the turbine, and c) the area of the turbine inlet.
In a cycle, a 4kg ideal gas(MW=3g/mol and k=2.3) confined in a controlled mass system went through three processes.the gas was started at 20kPa and 310K in the first process, and it was isometrically increased by 30kPa. The gas subject to 400Kusing a process defined by PV^3=C.It returns to its original state polytropically.Calculate the entropy change for each process.
3. Air enters a steady flow compressor at 100 kPa, 27EC and exits at 800 kPa. The process is polytropic with n = 1.3. Determine the specific work and the heat transfer in kJ/kg. Note that this is NOTan adiabatic compressor.

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