Engineering Answers

Describe about quasi - Fermi level

Describe about ionized impurity scattering

Describe about complete ionization

This problem consist of analyzing the accuracy of the finite element method in modeling the plane wall thermal problem. The plane wall is 1 m thick. The left surface of the wall (x=0) is maintained at a constant temperature of 200˚C, and the right surface (x=L=1 m) is insulated. The thermal conductivity is Kxx=25 W/(m ˚C) and there is a uniform generation of heat inside the wall of Q=400 W/m3 .

4. Use the FE interpolation function, 𝑇𝑇(𝑥𝑥) = ∑ 𝑁𝑁(𝑥𝑥)𝑑𝑑 = [𝑁𝑁]{𝑑𝑑} to plot the FE results along the length of the wall. Compare your results against the analytical solution. Nodal points should be labeled using a Marker (o, +, d, s, etc). Interpolation points should be connected with a line.

5. Develop a function that computes the second norm of the error (the difference between FE and the analytical solution throughout the length). The error should be computed at both the nodal points and interpolation points.  

Answer needs to be in matlab coding

Problem-2: This problem consist of analyzing the accuracy of the finite element method in modeling the plane wall thermal problem. The plane wall is 1 m thick. The left surface of the wall (x=0) is maintained at a constant temperature of 200˚C, and the right surface (x=L=1m) is insulated. The thermal conductivity is Kxx=25 W/(m˚C) and there is a uniform generation of heat inside the wall of Q=400 W/m3 .

1. Use the Matlab code provided to you in class to model the problem. Also, use 5 elements for Hand Solution.  

2. Compare your results to the analytical solution, given by: T(x)=QxL/K_xx(1-x/2L)+T(0)

3. Prepare a table that reports the nodal temperature results of Matlab, and the analytical solution evaluated at the nodal points.

The speed of the butadiene dimerization reaction was investigated by measuring the total pressure in a batch reactor operating isothermally at a temperature of 326 degrees Celsius. The measurement results are as follows:

t (minutes) 0 5 10 15 20 25 30 35 40 45 50 55 60 70

Pt (mmHg) 632 611 552 573.5 558.5 545 533.5 523 514 505 497 490 484 473

Calculate the order reaction and the rate constant for the reaction. Then the equation for the rate of reaction

Two streams of water are mixed to form the feed to a boiler. Process data are as follows:

Feed streams 1: 100 kg/min@30C

Feed streams 2: 195 kg/min@65C

Boiler pressure : 17 bar absolute

Calculate the required heat input to the boiler in kJ/min if the emerging steam is saturated at the boiler pressure. Neglect the kinetic energy, potential energy and work.

Your final answer must be in 1 decimal place with unit kJ/min.

A superheated steam at 10 bar absolute with 150 °C is fed to a boiler at rate of 200

kg/min. It is desired to produce new superheated steam at 250°C and 10 bar with rate of

407.42 kg/min that emerge at position of 50 m higher than the inlet stream by mixing the

inlet superheated steam at 10 bar absolute with a second stream of saturated steam at

10 bar and 207.42 kg/min. Determine the heat input to the boiler (kJ/s)

In a wheat growing area, the cultivable land is 200 acres and wheat will be cultivated to all of the lands. The permissible interval between two irrigation peak period is 15 days and the depth of the irrigation required for that particular soil & argo-climatic region at peak period is 2.5 in. If the total head for pumping is 80 ft, pump efficiency is 85%, mortor efficiency is 80%, and the maximum allowable operating period of the pump is 16 hr/day. Determine (a) the required pump capacity (Q) for that command area (b) capacity of the mortor (hydraulic horespower) and (c) rated capacity of the motor.