Flow visualisation at the nozzle fitted in a square section test duct by Particle Image Velocimetry system
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 5
Abstract
The objective of this experimental work is to investigate the flow at the nozzle in a square section test duct by Particle Image Velocimetry system. The two components of the velocity i.e. velocity field in a plane, vorticity, strain rate, are visualize by Particle Image Velocimetry (PIV) system. A new setup for swirling flow in a square section test duct in the PIV laboratory is designed which is four feet long with height D=1 foot and width H=1 foot. The aspect ratio of test duct is defined as ratio of larger dimension to smaller dimension of the cross section of the test duct. Hence aspect ratio of this test duct is one. Venturimeter is used to measure the discharge through four nozzles. Pump is used to supply water to the nozzles through pvc pipe. The swirling in the test duct is created by the nozzles incorporated at four faces with the help of supply of water tangentially into the section. But in this paper objective is to flow visualize at the nozzle only. Pure water loaded with seeding particle known as tracer is used to trace the path of flow. The PIV system consists of laser, CCD camera, synchronizer, computer etc. Two pulses of laser illuminate the seed particle at the section and two photographs are taken by high speed CCD camera which is analyze by PIV using INSIGHT3G software to get one velocity vector. The laser and CCD camera are perpendicular to each other. INSIGHT software measures velocity using one of three correlation processes: Autocorrelation, 1-Frame CrossCorrelation and 2-Frame Cross-Correlation.
Authors and Affiliations
Omprakash Yadav, Kushalendra Kumar Dubey, Saigeeta Priyadarshini
Keywords
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