The assignment for measuring the loss coefficient of perforated plates was handed out in class.
Since I posted this assignment late, it is OK for you to turn in your report by noon on Friday, 19 May. I'm sorry for taking so long to provide this rubric. A series of deadlines over the past week and a half has interfered with my ability to provide timely feedback for the class. I will be digging out from my backlog this week. I'm sorry that my schedule has caused problems.
The following table provides the grading rubric that is used to score your report. Be sure to address each of the categories in your report. The Max Score column allows you to see the relative importance of each category.
| Category | Max score |
| Accuracy and format of sketches | 5 |
| Report of raw data | 10 |
| Equations for uncertainty analysis | 15 |
| Tabular and graphical display of results | 40 |
| Computation of loss coefficient and comparison with Idelchik | 15 |
| Discussion | 15 |
| Grammar, spelling, organization and clarity of prose | 10 |
| Total | 110 |
There are a lot of similarities between this lab (number 4) and the preceding lab on fan curve measurements. There is no need to reproduce all of the information that you included in the preceding lab. For example, you do not need to describe how the flow bench works, or the equations for calculating the flow rate. On the other hand, if you have already completed a lot of writing (or cloned it from the preceding lab), there is no need to remove that material either.
List the parameters that controlled the raw data collection with Benchlink: scan interval (frequency), channels scanned, resolution (number of digits), and input range.
Include the raw averaged data in an appendix. Do not
include a print out of all of the data saved by the Benchlink
data logging software. We are only interested in the averaged
data created with flowBenchDataSelector.
One way to get the values of the averaged data is to print it out in
the MATLAB command window with the
dumpFlowBenchStats function.
Briefly describe the uncertainty calculations in
lossCoeffStats and its subordinate mfiles. How is
the uncertainty in the flow rate computed? Briefly list the sources
of uncertainty for each of the input variables in the formula
for flow rate.
Briefly discuss how the data reduction process differs from the previous lab. A short paragraph is sufficient. In the appendix of the report, include print outs of spreadsheets or MATLAB program listings. Include only those MATLAB listings of programs you modified.
Present the pressure drop versus flow rate data in tables and plots. Include one table for each perforated plate. Identify the hole diameter, hole spacing and free area ratio for each plate.
For the data you recorded, give the value of the loss coefficient in the form Dp = c*Q2 and h = KLV2/(2g).
Discuss the agreement between your measured data and the loss coefficient from Idelchik's formula.
All tables and figures must be numbered and have a caption. Refer to the description of the short report format for examples.