Effect of particle polydispersity on particle concentration measurement by using laser Doppler anemometry

Date

2007-08-01

Author

Ayranci, Isil
Pinguet, Guillaume
Escudie, Dany
Selçuk, Nevin
Vaillon, Rodolphe
Andre, Frederic

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

118
views

0
downloads

Measurement of particle concentration by laser Doppler anemometry (LDA) is studied on a vertical air jet seeded by a powder disperser with controlled particle and air flow rates. Particle arrival rate is utilized to retrieve particle number densities from conventional LDA operation. The effect of polydisperse nature of the particles is assessed. Comparisons between measured and estimated particle number densities suggest that only a certain portion of the particle population with a particle size to fringe spacing ratio around unity can be detected. Results indicate that reliable measurement of absolute particle concentration is possible for a particle population of narrow size distribution with an average diameter equivalent to fringe spacing. Present number density measurement technique which is useful for practical purposes with conventional LDA systems is found to yield physically reasonable profiles in both laminar and turbulent regimes. (c) 2006 Elsevier Inc. All rights reserved.

Subject Keywords

Particle number density, LDA, Particle-laden jet, Laminar, Turbulent

URI

https://hdl.handle.net/11511/30023

Journal

EXPERIMENTAL THERMAL AND FLUID SCIENCE

DOI

https://doi.org/10.1016/j.expthermflusci.2006.03.031

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Effect of Passive Bleeding on Flow Structure over a Nonslender Delta Wing Celik, Alper; Cetin, Cenk; Yavuz, Mehmet Metin (2017-08-01) The effect of passive bleeding on flow structure of a 45 deg swept delta wing is studied in a low-speed wind tunnel using techniques of laser-illuminated smoke visualization, surface-pressure measurements, and particle image velocimetry. Three different bleeding configurations are tested to identify the effectiveness of the control technique compared to a base planform for a broad range of attack angles 6 <= alpha <= 6deg at Reynolds numbers Re=3.5x10(4) and Re=10(5). The results indicate that all bleeding ...
Effect of thickness-to-chord ratio on aerodynamics of non-slender delta wing Ghazijahani, Mohammad Sharifi; Yavuz, Mehmet Metin (2019-05-01) The effect of thickness-to-chord (t/C) ratio on aerodynamics of a non-slender delta wing with sweep angle of 45 degree is characterized in a low-speed wind tunnel using laser illuminated smoke visualization, surface pressure measurements, particle image velocimetry, and force measurements. The delta wings of t/C ratios varying from 2% to 15% with 45 degree windward beveled leading edges are tested. The results indicate that the effect of t/C ratio on flow structure is quite substantial. Considering the low ...
Effect of pressure and particle size on the thermal cracking of light crude oils in sandstone matrix Kök, Mustafa Verşan (Springer Science and Business Media LLC, 2009-4-27) This research is focused on the effects of pressure (100-300 Pa) and matrix and on light crude oil combustion in sandstone matrix using pressurized differential scanning calorimetry (PDSC). Light crude oils and sandstone mixtures were prepared to give a composition of 15 mass% crude oil in sandstone matrix. A total of forty-eight PDSC experiments were performed. Roger and Morris kinetic model was used to analyse the data obtained from PDSC experiments and the results are discussed.
Effect of Thickness-to-Chord Ratio on Flow Structure of a Low Swept Delta Wing Gulsacan, Burak; Sencan, Gizem; Yavuz, Mehmet Metin (American Institute of Aeronautics and Astronautics (AIAA), 2018-12-01) The effect of thickness-to-chord (t/C) ratio on flow structure of a delta wing with sweep angle of 35 deg is characterized in a low-speed wind tunnel using laser-illuminated smoke visualization, particle image velocimetry, and surface pressure measurements. Four different t/C ratios varying from 4.75 to 19% are tested at angles of attack, 4, 6, 8, and 10 deg, for Reynolds numbers Re =1 x 10(4) and 3.5 x 10(4). The results indicate that the effect of thicknessto-chord ratio on flow structure is quite substan...
Effect of thermal neutron irradiation on the elastic constants of tourmaline Özkan, H. (Informa UK Limited, 1987-2) The effect of thermal neutron irradiation due to the B10(n, α)Li7 reaction on the elastic wave velocities and the elastic moduli of tourmaline crystals has been studied. Oriented tourmaline samples have been irradiated with thermal neutrons to 7.6 × 1018n/cm2 and the elastic wave velocities determined by ultrasonic measurements. The elastic wave velocities are not affected by thermal neutron irradiation below 8 × 10l7n/cm2, effects starting to appear at approximately 1 × l018n/cm2 with more important decrea...

Citation Formats

I. Ayranci, G. Pinguet, D. Escudie, N. Selçuk, R. Vaillon, and F. Andre, “Effect of particle polydispersity on particle concentration measurement by using laser Doppler anemometry,” EXPERIMENTAL THERMAL AND FLUID SCIENCE, pp. 839–847, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30023.