• Semester 6, position 4

The goal of this course is to introduce fundamentals of measurement techniques to the students, with emphasize on flow measurement techniques. The main goal is the study of significant terms in metrology, as well as principles of classical and contemporary measuring techniques, flow visualization methods, data acqusition and basic statistical data analysis. It is an intention to train students for complex challenges in fluid flow measurements with scientific and engineering applications.

Upon successful completion of this course, students: 1. are able to calibrate contemporary and classical devices for measuring speed, flow and pressure, 2. are acquainted with application of the following anemometers: laser Doppler anemometer (LDA), particle image velocimetry (PIV) probe with hot wire (HWA), as well as other classical methods, 3. are acquainted with hydraulic machines tests (turbines, pumps and fans), 4. could perform data acquisition with modern measurement and acquisition systems, as well as their basic statistical analysis.

Metrology and short historical overview. Measurement devices for pressure, velocity, flow, temperature and humidity. Fundamentals of statistical data processing. Measurement uncertainty. International standards in calibration. Airtunnels for calibration of pressure and anemometer probes. Measurement of velocity and pressure fields in conduit flows (ventilation channels, water systems and etc.) and free turbulent jet. Fluid flow visualization. Basic measurement principles of Hot-wire anemometry (HWA). Overview of laser measurement techniques for single and multi-phase flows. Basic measurement principle of laser Doppler anemometry (LDA) and plane and stereo Particle image velocimetry (PIV). Introduction to Micro PIV. Protection measures. Introduction to experimental determination of the hydraulic machines (pumps and fans) performance curves. Basics of data acquisition.

1. Types of pressure and anemometer probes. 2. Calibration airtunnels for anemometer probes. 3. Test of the flow uniformity in calibration airtunnel jet with Pitot probe. 4. Calibration of the vane anemometer probe. 5. Calculation of the uncertainty of measurement in calibration of pressure measuring device. 6. Softwares for data acquisition and processing. Examples in anemometry and pressure, flow, humidity, force and temperature measurements. 7. Hot-wire anemometers: various geometries, sensors, calibration, data processing. 8. Fluid flow visualization with filaments, fog machine, atomizer and etc. 9. Nd:Yag laser for PIV measurements: construction and adjustment. 10. Application of LabView software.

Not applicable.

1. Textbooks listed in the references and list of literature provided for students. 2. Lecture handouts. 3. Laboratory for hydraulic machines - calibration test rigs and equipment.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 3
Laboratory exercises: 15
Calculation tasks: 0
Seminar paper: 12
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 7
Review and grading of seminar papers: 4
Review and grading of the project: 0
Test: 0
Test: 0
Final exam: 4

Activity during lectures: 0
Test/test: 0
Laboratory practice: 10
Calculation tasks: 0
Seminar paper: 60
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 21

Ilić D. B., Čantrak Đ. S. (2022): Manual for Fluid Flow Measurements in Laboratory, Faculty of Mechanical Engineering University of Belgrade, Belgrade. (in Serbian); Benišek М., Nedeljković М., Kilibarda R., Gerasimović D. (2000): The Measurement Techniques. Exercises in Flow Measurements, 2nd Ed., Fac. of Mechanical Eng. Univ. of Belgrade, Belgrade. (in Serbian); Čantrak Đ.S.(2022):Investigation of the Turbulent Rankine Vortex in Pipe behind Axial Fan Impeller Using Optical (PIV and LDA) Measurement Methods and Visualization,NTI,Vol.59,No.1,MTI,Belgrade(Serb); Tropea C., Yarin A., Fosss J. (Eds.) (2007): Springer Handbook of Experimental Fluid Mechanics, Springer-Verlag, Berlin, Heidelberg.; Van Dyke M. (1982): An Album of Fluid Motion, The Parabolic Press, Stanford, California.