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The Use of Sensor Binning Option in Double-Shutter CCD Based Digital Particle Image Velocimetry

100%

Akselli B., Teke İ.

Acta Physica Polonica A

2013

vol. 123

issue 2

439-444

In this work we present an experimental investigation of the benefits of double-shutter CCD's pixel binning option in double-frame particle image velocimetry experiments. The CCD binning process increases the sensitivity, signal-to-noise ratio and frame rate of the imaging sensor at the cost of spatial resolution. In order to explore the benefits of the CCD pixel binning option, in low level illuminated particle image velocimetry measurements, we have carried out of series of flow velocity measurements experiments in 30 μm × 300 μm × 50000 μm microchannel using micro particle image velocimetry setup. The system is equipped with dual cavity laser system conjugated with an optical attenuator for volume illumination, a double-shutter CCD camera (1392×1040 quadratic pixels with 6.45 μm size), a high magnification optical epifluorescent microscope and a syringe pump. The flow images were recorded at normal, 2×1, 1×2 and 2×2 pixel binning modes of a monochrome CCD camera. A comparison of velocity vector patterns obtained in low level illumination experiments for four different pixel binning modes shows that pixel binning option significantly increases the signal-to-noise ratio in particle image velocimetry recordings. A good agreement of experimental velocity profiles obtained using cross-correlation analysis and sub-pixel interpolation scheme based on a Gaussian regression with theoretical calculated profiles shows the consistency of the experimental results.

Investigation of the Effects of Erosion Test Parameters on the Particle Impengement Velocity by Using CFD Analysis

51%

Önen B., Yıldıran Y., Avcu E., Çınar A.

Acta Physica Polonica A

2015

vol. 127

issue 4

1225-1229

Particle impingement velocity is one of the most important parameters in solid particle erosion. Particle impingement velocity depends on erosion test parameters such as particle acceleration pressure, erodent particle size and standoff distance. Over the past decades many experimental studies have been conducted to examine the effects of these parameters on the particle impingement velocity. In this study, the effects of particle acceleration pressure, erodent particle size and standoff distance on the particle impingement velocity have been investigated by using a computational fluid dynamics (CFD) program, FLUENT. In order to achieve these goals solid particle erosion tests are simulated under various test parameters and the effects of these parameters are examined in detail. The effect of particle velocity on the flow field is characterized with method geometrics. Two-dimensional plane symmetrical models are utilized to reduce the computation time. Plots of gas pressure and particle velocity contours at the XY symmetrical plane from nozzle inlet to substrate were given. CFD analysis showed that all erosion test parameters have dramatically affected particle impingement velocity. Particle impingement velocity was increased with increases in acceleration pressure while it was decreased with increases in both erodent particle size and standoff distance.

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2 Acta Physica Polonica A

1 2015

1 2013

1 Akselli B.

1 Avcu E.

1 Teke İ.

1 Yıldıran Y.

1 Çınar A.

1 Önen B.

Search results

The Use of Sensor Binning Option in Double-Shutter CCD Based Digital Particle Image Velocimetry

Investigation of the Effects of Erosion Test Parameters on the Particle Impengement Velocity by Using CFD Analysis