3- Air at 80 kPa, 27°C, and 220 m/s enters a diffuser at a rate of 2.5 kg/s and leaves at 42°C. The exit area of the diffuser is 400 cm2. The air is estimated to lose heat at a rate of 18 kJ/s during this process. Determine (a) the exit velocity and (b) the exit pressure of the air. Answers: (a) 62.0 m/s, (b) 91.1 kPa

3- Air at 80 kPa, 27°C, and 220 m/s enters a diffuser at a rate of 2.5 kg/s and leaves at 42°C. The exit area of the diffuser is 400 cm2. The air is estimated to lose heat at a rate of 18 kJ/s during this process. Determine (a) the exit velocity and (b) the exit pressure of the air. Answers: (a) 62.0 m/s, (b) 91.1 kPa

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

See similar textbooks

Similar questions

A vapor at a flow rate of 3 kg/s enters a group of eight (8)nozzles at 1.5 MPa, 240 oC and a velocity of 480 m/s, and then expands to 0.07MPa. If the efficiency of each nozzle is 0.95 and the cross-sectional area ofeach nozzle is rectangular with sides’ length ratio is 1:2.5. Determine:a- The steam exit velocity for each nozzle and the dimensions of the nozzlesection at its entrance and its exit.b- The steam exit velocity in case of the neglecting the steam entrance velocity
Air at 15°C and 95 kPa enters the diffuser of a jet engine steadily with avelocity of 250 m/s. The inlet area of the diffuser is 0.5 m2. The air leaves thediffuser with a velocity that is very small compared with the inlet velocity.Determine The following:1- The mass flow rate of the air2- The temperature of the air leaving the diffuser3- The power and rate of heat transfer within the diffuser.
An Ideal gas is being heated in a circular duct as while flowing over an electric heater of 130 kW. The diameter of duct is 500 mm. The gas enters the heating section of the duct at 100 kPa and 27 deg C with a volume flow rate of 15 m3/s. If heat is lost from the gas in the duct to the surroundings at a rate of 80 kW, Calculate the exit temperature of the gas in deg C. (Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat; Cp =1000 J/kg K; R = 500 J/kg K)
A pump increases the water pressure from 70 kPa at the inlet to 700 kPa at the outlet. Water enters this pump at 45 oC through a 1.5 cm diameter opening and exits through a 2.1 cm diameter opening. Determine the velocity of the water at the (a) inlet and (b) outlet when the mass flow rate through the pump is 1.4 kg/s. Submit your solution by multiplying (a)*(b) = Format answer : 46.84 Submit
In a food processing industry, steam and water are mixed to produce acontinuous supply of hot water. 13 kg/s of water with a specific enthalpy of50 KJ/Kg and 2 kg/s of steam with a specific enthalpy of 2670 KJ/Kg flowinto a mixing chamber. If the heat loss from the chamber is 780 Watts,determine the temperature of the hot water produced.
Steam ė Steam enters a nozzle at 600 kPa and 500°C at a velocity of 9.9 m/s. Steam leaves the nozzle at 500 kPa and 300°C. The nozzle has an inlet area of 250 cm² and loses heat at a rate of 95 kJ/kg. What is the mass flow rate of steam that passes through the nozzle? kg/s What is the velocity of the steam at the exit? m/s What is the area of the nozzle exit? cm²
3) Refrigerant-134a enters a diffuser steadily as saturated vapor at 800 kPa with a velocity of 120 m/s, and it leaves at 900 kPa and 40°C. The refrigerant is gaining heat at a rate of 2 kJ/s as it passes through the diffuser. If the exit area is 80 percent greater than the inlet area, determine (a) the exit velocity and (b) the mass flow rate of the refrigerant. (for R-134, vs00 kPa= 0.025621 m/kg; hs00 kPa-267.29 kj/kg) (for R-134, v900 kPa, 40°C= 0.023375 m'/kg; h9oo kPa, 40°C-274.17 kj/kg)
Air enters a 28-cm diameter pipe steadily at 200 KPa and 20oC with a velocity of 5 m/s. Air is heated as it flows, and leaves the pipe at 180 KPa and 40oC. Determine the mass flow rate of air in kg/s. R for air is 0.287 KJ/Kg-K.
Steam enters an adiabatic, turbine at 9 MPa, 550°C and 85 m.s and exits the turbine at 80-kPa, 55-m/sand having a quality of 91%. The mass flow rate of the steam through the turbine is steady at 21 kg/s.Calculate:The change in kinetic energy of the steamThe output power of the turbineThe inlet area to the turbine
Q1/Steam at (5 MPa and 400°C) enters a nozzle steadily with a velocity of 80 m/s, and it leaves at (2 MPa and 300°C). The inlet area of the nozzle is (50 cm2). Determine (a) the mass flow rate of the steam, (b) the exit velocity of the steam,
(4) An adiabatic mixing chamber is used to mix 2.14 kg/s of water at 960 kPa and 30°C with 0.7 kg/s of water at 960 kPa and 70C to as one water steam at 960 kPa and certain desired temperature. If the exit pipe diameter is 2.2 cm, the exit velocity is: (a) 6.81 m/s (b) 7.05 m/s (c) 7.26 m/s (d) 7.53 m/s (e) 7.79 m/s
Air enters the compressor of a gas turbine plant at ambient conditions of 100 kPa and 25 ⁰Cwith a low velocity and exits at 1 MPa and 347 ⁰C with a velocity of 90 m/s. The compressionprocess is adiabatic, and the power input is 251. Determine the mass flowrateof the air through the compressor please be clear with the writing and explaining