# Combined density gradient and velocity field measurements in transient flows by means of Differential Interferometry and Long-range $$\varvec{\upmu }$$ μ PIV

Combined density gradient and velocity field measurements in transient flows by means of... In the present study, Long-range Microparticle Image Velocimetry ( $$\upmu$$ μ PIV) and Differential Interferometry (DI) are combined in a novel manner to enable both velocity and depth-integrated density gradient field measurements using the same laser pulse for both recordings. In the present work, temperature-driven boundary layer flows could be successfully determined to an accuracy of $$\Updelta T=0.17\,\hbox {K}$$ Δ T = 0.17 K with a spatial resolution of $$405\,\upmu \hbox {m}$$ 405 μ m for interference and $$101\,\upmu \hbox {m}$$ 101 μ m for $$\upmu$$ μ PIV measurements. The DI measurements are refraction compensated, and both temperature and velocity fields are compared with results from numerical simulations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

# Combined density gradient and velocity field measurements in transient flows by means of Differential Interferometry and Long-range $$\varvec{\upmu }$$ μ PIV

, Volume 57 (9) – Aug 12, 2016
11 pages

Publisher
Springer Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-016-2224-7
Publisher site
See Article on Publisher Site

### Abstract

In the present study, Long-range Microparticle Image Velocimetry ( $$\upmu$$ μ PIV) and Differential Interferometry (DI) are combined in a novel manner to enable both velocity and depth-integrated density gradient field measurements using the same laser pulse for both recordings. In the present work, temperature-driven boundary layer flows could be successfully determined to an accuracy of $$\Updelta T=0.17\,\hbox {K}$$ Δ T = 0.17 K with a spatial resolution of $$405\,\upmu \hbox {m}$$ 405 μ m for interference and $$101\,\upmu \hbox {m}$$ 101 μ m for $$\upmu$$ μ PIV measurements. The DI measurements are refraction compensated, and both temperature and velocity fields are compared with results from numerical simulations.

### Journal

Experiments in FluidsSpringer Journals

Published: Aug 12, 2016

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