Seattle, Washington
June 14, 2015
June 14, 2015
June 17, 2015
978-0-692-50180-1
2153-5965
Division Experimentation & Lab-oriented Studies: Mechanical Engineering and Control
Division Experimentation & Lab-Oriented Studies
27
26.1633.1 - 26.1633.27
10.18260/p.24969
https://peer.asee.org/24969
2265
Roger Beardsley is an associate professor of Mechanical Engineering Technology at Central Washington University, Ellensburg WA. He teaches classes in Thermodynamics, Fluids and Heat Transfer, among others. His professional interests include renewable energy, including biofuels.
Updates to a Sequence of Fluids Lab Experiments for Mechanical Engineering Technology StudentsThis paper presents an outline of fluids experiments and lab activities that accompany theintroductory fluids course for Mechanical Engineering Technology juniors at XXX University. Itoutlines and describes the current suite of fluids lab activities, comparing the current suite of labactivities to those outlined in an ASEE conference paper presented in 2001. Some lab activitiesin that paper have been replaced, while others have been updated. For example the Water FlowMeasurements Loop equipment has been converted from a large floor mounted system to aportable pallet based system. Also the emphasis of the experiment has evolved from evaluatingvarious flow measurement technologies to determining pump curves at variable RPM settings.Both the previous and current experiments have been found to be useful in bridging the gapbetween theory and practice. The experiments expose the student to modern instrumentation andthe collection and processing of data. Qualitative assessment of current student outcomes isaddressed with a student survey. The purpose of this paper is to present these lab activities sothat other fluids lab instructors may learn from our experience. Introduction At CWU, the introductory fluids class is a core class for the Mechanical Engineering Technology (MET) program. Most students are juniors in the second quarter of the core sequence of classes in the major. Though students may have touched on some fluids related topics in Physics classes, this is their first engineering fluids class. The current lab activities have evolved from those that were developed in the late 1980s and partially outlined in a paper by Kaminski (1) in 2001. In reviewing the literature on the topic of fluids lab activities, it becomes apparent that many engineering programs bundle fluids labs with thermodynamics labs, and sometimes even include heat transfer topics, often as a single lab class in senior year far removed from the original thermodynamics or fluids lecture section. While these topics do have significant interactions, by bundling them into one lab class there is a limit to the number of topics that can be explored. In the Mechanical Engineering Technology program at XXX, each core course has a lab section attached, and the labs are performed more or less concurrently with the related discussion in the lecture. Lab Activity Work Product The original lab activities assigned one report per group. While the group report format helps foster team building and cooperation, it commonly results in one student burdened with the bulk of the work in preparing the report. Group reports also allow students who are weak in writing skills to avoid that task. The work product assignment has been revised so that current lab activities require students to turn in individual reports. In assigning individual reports it is common in almost every class to identify students with weak writing skills. For students with a low grammar grade, an incentive is offered to change the grade if the student visits the campus writing center for help in revising the text. The work product for the current lab activities is the full format lab report with cover sheet, introduction, procedure, data, results, discussion, conclusion, references, and supporting materials in the appendix. Summary of Previous Lab Activities The previous suite of lab experiments was originally developed for the CWU MET program by Kaminski (1). A list of the previous lab activities is outlined in the Table 1. These activities have been revised or replaced based on equipment improvements and perceived effectiveness in student learning. The work product for each of these was a single group lab report. An example of the revisions to the labs is the Water Flow Measurements Loop lab, consisting of a floor mounted 500 gallon tank, a 440VAC 3 phase Variable Frequency Drive (VFD) for a 20 HP induction motor driving a centrifugal irrigation pump. This equipment consumed significant floor space, and lost its home during a recent building remodel. In 2012 a student senior project redesigned this lab with a 5 HP irrigation pump and corresponding VFD operating off the available 220VAC 3 phase power. The new lab equipment fits on a single pallet structure containing the pump, piping and various flow meters, with a 1000 liter Intermediate Bulk Container (pallet footprint) for water supply that stores on top when empty. The equipment is now portable and more flexible to configure, and has been used as a resource for high flow rate fluids testing for other projects. Lab Activities documented by Kaminski (1): 1. Water Flow Measurements Loop 2. Six Inch Air Flow Tunnel 3. Instrumented Torricelli Experiment Other Fluids lab activities performed but not documented: 4. Buoyancy Lab 5. Fluid Viscosity Lab 6. Table 1: Previous Fluids Lab Activities Outline of Current Lab Activities The current suite of lab activities includes six different activities, summarized in Table 2. The student work product for these labs is generally a full format lab report (title page, intro, procedure, data, results, discussion, conclusion, appendix with raw data, supporting calc and info). Thought students work together and have a group data set, and sometimes group results calculations, each student must write his own report. In this Paper, current lab activities are outlined following the table. For current lab activities that were revised from previous activities, a comparison is made. Current Lab Activity Titles Work Product 1. Specific Gravity and Density Lab Technical Memo 2. Viscosity Lab Individual Lab Report 3. Buoyancy Lab Individual Lab Report 4. Torricelli Experiment Individual Lab Report 5. Pump Performance Lab Individual Lab Report 6. Self-‐Designed Experiment Individual Lab Report Table 2: Current Fluids Lab Activities What follows is a brief outline and discussion of each of the current lab activities, with comparison to the related previous lab where appropriate. The appendix includes more detailed information about the current labs, including the assignment sheets and typical data from the experiments. Lab 1: Specific Gravity & Density Lab Lab 2: Viscosity Lab Lab 3: Buoyancy Lab Lab 4: Torricelli Experiment Lab 5: Pump Performance Lab Lab 6: Self Designed Experiment References (1) Kaminski, Walter R: Fluid Mechanics Facilities and Experiments for the MechanicalEngineering Technology Student Paper AC2001-‐2526
Beardsley, R. A. (2015, June), Updates to a Sequence of Fluids Lab Experiments for Mechanical Engineering Technology Students Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.24969
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