Pengembangan Metode Pengukuran Medan Kecepatan Aliran Dengan Metode Bayangan Partikel
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2000
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/18707/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=1508 |
Daftar Isi:
- Flow velocity measurement is one of the very important aspect in the field of hydraulics. Until today, the commom method used in measuring flow velocity is limited to one point measurement. In order to get velocity pattern in a single measurement, multi point velocity measurement methods such particle image and tracking methods have to be developed A study for the development of the instrument based on particle image method has been conducted. The developed measurement method was validated by applying it on velocity field measurement of two steady uniform flow cases, they were: flow in normal straight flume and down-stream flow of broad crested weir. Collecting and analyzing data procedure were as follows: setting up flow cases and inserting particles into water flow, lighting the flow and recording image by developed instrument, photographic (studio) processing, photo scanning, reading pixel brightness data, transforming pixel data into velocity flow data, visualizing velocity vectors, and validating data by comparing them with data collected by a volumetric calibrated Mini Propeller velocimeter. The results indicate that data collected by developed measurement method were comparable and relevant to data collected by the volumetric calibrated Mini Propeller. The mean velocity profile measured by developed measurement method in straight flume was 8-14 cm/s, meanwhile that of Mini Propeller was 9-13.5 cm/s. Measurement error between data obtained by those two methods was 4.8 percent (RMS= 0.5635 cm/s). In case of downstream flow of a broad crested weir, the data were 0.97-2.24 cm/s for developed measurement method and 0.77-2.19 cm/s for standard measurement. Measurement error was 7.7 percent (RMS=0.1228 cm/s). Furthermore, by using the measurement method developed in this research, location, magnitude, and direction of the velocity vectors distributed on the velocity field would be available simultaneously.