Projected area of measurement volume in phase-Doppler anemometry and application for velocity bias correction and particle concentration estimation

Projected area of measurement volume in phase-Doppler anemometry and application for velocity...  The measurement volume in laser-Doppler anemometry is non-spherical, which leads to the fact that the projected area to the fluid flow varies with direction of the flow. The mathematical description of this direction-dependent projected area in the case of a 3-D phase-Doppler anemometer is developed. It is shown that depending on the angle between the 2-D and the 1-D probe the projected area variation with direction ranges from 40% for an orthogonal setup, to 275% when the angle is 30°. In the case of complex 3-D flows, as in agitated tanks, this projected area variation leads to a direction bias in determination of time averaged values of the flow. By using experimental data from an agitated suspension, it is shown that the bias effect on the mean velocity can be neglected for an orthogonal optical setup. However, at decreasing angle between the probes this effect may become important. In addition, it is also shown that in determination of particle concentrations in agitated tanks the variation in projected area must be accounted for. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Projected area of measurement volume in phase-Doppler anemometry and application for velocity bias correction and particle concentration estimation

Loading next page...
 
/lp/springer_journal/projected-area-of-measurement-volume-in-phase-doppler-anemometry-and-0sHrNSLZF7
Publisher
Springer-Verlag
Copyright
Copyright © 1999 by Springer-Verlag 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/s003480050344
Publisher site
See Article on Publisher Site

Abstract

 The measurement volume in laser-Doppler anemometry is non-spherical, which leads to the fact that the projected area to the fluid flow varies with direction of the flow. The mathematical description of this direction-dependent projected area in the case of a 3-D phase-Doppler anemometer is developed. It is shown that depending on the angle between the 2-D and the 1-D probe the projected area variation with direction ranges from 40% for an orthogonal setup, to 275% when the angle is 30°. In the case of complex 3-D flows, as in agitated tanks, this projected area variation leads to a direction bias in determination of time averaged values of the flow. By using experimental data from an agitated suspension, it is shown that the bias effect on the mean velocity can be neglected for an orthogonal optical setup. However, at decreasing angle between the probes this effect may become important. In addition, it is also shown that in determination of particle concentrations in agitated tanks the variation in projected area must be accounted for.

Journal

Experiments in FluidsSpringer Journals

Published: Jul 2, 1999

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off