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Temperature Measurements Inside a thin Fluid Layer with Background Oriented Schlieren Method

Tokgoz, S. and Geisler, Reinhard and van Bokhoven, L. J. A. and Wieneke, Bernhard (2012) Temperature Measurements Inside a thin Fluid Layer with Background Oriented Schlieren Method. 15th International Symposium on Flow Visualization, Minsk, Belarus, Russia, 25. - 28. Jun. 2012,.

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Official URL: http://www.isfv15.com/home/

Abstract

Background oriented schlieren (BOS) is a quantitative measurement method based on refractive index change of the fluid in question. The change of the refractive index is related with density, temperature and concentration gradients. So far, the technique has been used in various flow types. Since the measurement includes acquisition of an image of a background target, all previous applications were on test sections where both sides are optically accessible. In this study, we aim to extend the application to cases where the optical access to the test section is limited to only one direction. We performed measurements in a thin fluid layer (3 mm thick) bounded by a glass plate on top and highly reflective surface below. Flow was provided by two parallel jets. Using the reflected image of background target, it became possible to measure 2D temperature gradients with a good precision. The temperature gradients are integrated to compute the temperature distribution inside the fluid layer. Independent temperature measurements were done with thermistors and used as boundary condition for the integration and comparison of the results. Temperatures can be estimated with an accuracy at the order of 10 mK.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Temperature Measurements Inside a thin Fluid Layer with Background Oriented Schlieren Method
Authors:
AuthorsInstitution or Email of Authors
Tokgoz, S.Delft University of Technology, Delft, 2628 CA, The Netherlands
Geisler, ReinhardUNSPECIFIED
van Bokhoven, L. J. A.4ASML, Veldhoven, 5504 DR, The Netherlands
Wieneke, BernhardLaVision, Göttingen, D
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings
Status:Published
Keywords:temperature, flow visualization, water layer, jet, background oriented schlieren
Event Title:15th International Symposium on Flow Visualization
Event Location:25. - 28. Jun. 2012,
Event Type:international Conference
Event Dates:Minsk, Belarus, Russia
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:24 Jul 2012 15:56
Last Modified:09 Oct 2012 15:03

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