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Experiments in Fluids

, 57:138 | Cite as

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

  • S. Kordel
  • T. Nowak
  • R. Skoda
  • J. Hussong
Research Article

Abstract

In the present study, Long-range Microparticle Image Velocimetry (\(\upmu\)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 \(\Updelta T=0.17\,\hbox {K}\) with a spatial resolution of \(405\,\upmu \hbox {m}\) for interference and \(101\,\upmu \hbox {m}\) for \(\upmu\)PIV measurements. The DI measurements are refraction compensated, and both temperature and velocity fields are compared with results from numerical simulations.

Keywords

Particle Image Velocimetry Particle Tracking Velocimetry Refractive Index Gradient Velocity Field Measurement Brass Plate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

\(\alpha\)

Fringe orientation angle

\(\bar{\rho }\)

Depth-averaged density

\(\beta\)

Divergence angle of Wollaston Prism

\(\delta\)

Standard deviation

\(\delta _{ref}\)

Deviation related to reference density gradient

\(\eta ,\zeta\)

Cartesian coord. aligned with reference fringes

\(\lambda\)

Wavelength of light

\(\rho\)

Density

\(\Updelta S\)

Fringe shift

\(\Updelta x\)

Distance along x-axis

\(\Updelta x_{r}\)

Refraction-induced light ray shift

\(\Updelta y\)

Distance along y-axis

b

Measurement volume thickness

d

Neighbouring light ray distance

dt

Interframing time

f

Focal length

I

Laser intensity

K

Gladstone Dale constant

L

Distance between test section and lens

Nu

Nusselt number

p

Pressure

S

Homogeneous fringe spacing

T

Temperature

t

Time

v

Velocity

W

Distance between Wollaston prism and focal point

Notes

Acknowledgments

This research was financially supported by DFG (HU 2264/1-1).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Chair of Fluid MachineryRuhr-University BochumBochumGermany

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