Engineering Mechanics (8th Edition) Chapter 3, Problem 212P
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Saturated liquid water at 1 MPa enters a D = 5 cm pipe at a rate of m(dot) = 2 kg/s. Heat is transferred to the water at a rate of Q(dot) = 5000 kW. The exit is at 1 MPa pressure.
(a) Neglecting kinetic energy, calculate the temperature at the pipe exit. (ans = 400◦C)
(b) Using your answer in a), calculate the exit velocity of the water. (ans = 312 m/s)
(c) Based upon your answer, should kinetic energy be included in your analysis? (ans = probably)
(d) Including the exit kinetic energy, recalculate the exit temperature. Iterate this procedure a couple of times. (ans = 378◦C)
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One kg of water in a piston-cylinder assembly,
initially at 1.5 bar and 200 C, cools at constant pressure with no
internal irreversibilities to a final state where the water is a
saturated liquid. For the water as the system, determine the work,
the heat transfer, and the amounts of exergy transfer accompanying
work and heat transfer, each in kJ. Let T0 = 20 °C, p0=1 bar and
ignore the effects of motion and gravity.
THERE ARE SOME DIFFERENT ANSWERS TO THIS QUESTION. I FOUND AN
ANOTHER ANSWER, I HAVE MANY QUESTION MARKS IN MY MIND. ADDITION OF
EXERGY TRANSFER ACCOMPANYING WORK AND HEAT SHOULD BE EQUAL TO
E2-E1. SINCE ITS INTERNALLY REVERSIBLE. ON THE OTHER HAND WHEN I
USE 'E2-E1=(U2-U1)+P0×(V2-V1)-T0(S2-S1)' I FIND AN ANOTHER NUMBER.
PLEASE HELP.
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Determine the specific volume (m3/kg) of air at T = 159.6 K and P = 37.5 bar using the generalized compressibility chart.
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A cylindrical specimen of some metal alloy 8.6 mm in diameter is stressed in tension. A force of 9070 N produces an elastic reduction in specimen diameter of 0.0048 mm. Calculate the elastic modulus (in GPa) of this material if its Poisson's ratio is 0.33.
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Compare the following: belt drive, chain drive, and gear system.
What are the fundamental characteristics of each? What are the advantages and disadvantages of each?
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Water flows upward and then is discharged to the right through a 3 inch diameter pipe elbow, at a steady flow rate of 1 cubic foot per second, the gage pressure at the entrance to the elbow is 30 psi. What vertical and horizontal force is necessary to hold the elbow stationary, neglecting any required torque.
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3. Sketch a T-v diagram and find the specified state for the following states
a. Propane at critical temp & press find T(°C), p(bar) and v(m3 /kg)
b. Water v=.05 m3 /kg, T=140°C find p(bar)
c. Water at p=30 MPa, T=100°C find v(m3 /kg)
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Explain what the viscoelastic behavior of plastic materials is.
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In your own words describe the mechanisms for the elastic deformation of thermoplastics and for the plastic deformation of thermoplastics. please write clearly |
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how we can regenerated fix bed reactor inside catalysts we want use again catalysts
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An adiabatic steam power plant turbine receives 500kg/s in steady flow at 8MPa and 500 degrees C(state 1), the steam exits at 15kPa with quality of 0.95(state 2 actual). Find a) isentropic power output of the turbine using listed pressures, b) actual power output of the turbine, c) isentropic efficiency of the turbine, d) s2-s1
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An adiabatic steam power plant turbine receives 500kg/s in steady flow at 8MPa and 500 degrees C(state 1), the steam exits at 15kPa with quality of 0.95(state 2 actual). Find a) isentropic power output of the turbine using listed pressures, b) actual power output of the turbine, c) isentropic efficiency of the turbine, d) s2-s1
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There are three dominant metal additive manufacturing approaches: laser powder sintering, plasma metal wire, and electron beam metal wire. Construct a table that compares the three with respect to: breadth of materials that can be processed, quality of processed material, and scalability.
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The specification of a pressure sensor is shown below: Range of measurement: 10 psi to 250 psi. Accuracy : ±0.2% of span. Transfer function : 0.5?/psi. Transfer function accuracy: ±0.1% Sensor output resistance, R : 2k? - 20k?. Sensor time constant: 200 ms
. The resistance is then converted to a voltage with the transfer function:
V= 10R/R+1000
1/Determine the uncertainty for measurement of 120psi. What is the possible pressure?
2/Determine the possible range of the transfer function. Interpret the possible range that you have determine.
3/Determine the linear relationship between resistance and pressure. Draw a graph and explain briefly why it should be linear relationship.
4/Determine the pressure result from a resistance of 10 k?.
5/At t = 0 s, the pressure change suddenly from 12 psi to 120 psi. Determine the voltage output and its pressure at 0.24 s. At what time the output reach 0.3V?
In: Mechanical Engineering