A clamp-on measurement system for flexible and accurate fluid temperature measurements for turbulent flows with Reynolds numbers higher than 30,000 is presented in this paper. This noninvasive system can be deployed without interference with the fluid flow while delivering the high accuracies necessary for performance and acceptance testing for power plants in terms of measurement accuracy and position. The system is experimentally validated in the fluid flow of a solar thermal parabolic trough collector test bench, equipped with built-in sensors as reference. Its applicability under industrial conditions is demonstrated at the 50 MWel AndaSol-3 parabolic trough solar power plant in Spain. A function based on large experimental data correcting the temperature gradient between the measured clamp-on sensor and actual fluid temperature is developed, achieving an uncertainty below ±0.7 K (2σ) for fluid temperatures up to 400 °C. In addition, the experimental results are used to validate a numerical model. Based on the results of this model, a general dimensionless correction function for a wider range of application scenarios is derived. The clamp-on system, together with the dimensionless correction function, supports numerous combinations of fluids, pipe materials, insulations, geometries, and operation conditions and should be useful in a variety of industrial applications of the power and chemical industry where temporal noninvasive fluid temperature measurement is needed with good accuracy. The comparison of the general dimensionless correction function with measurement data indicates a measurement uncertainty below 1 K (2σ).
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June 2018
Research-Article
Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows
Bijan Nouri,
Bijan Nouri
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
e-mail: Bijan.nouri@dlr.de
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
e-mail: Bijan.nouri@dlr.de
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Marc Röger,
Marc Röger
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
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Nicole Janotte,
Nicole Janotte
German Aerospace Center (DLR),
Institute of Solar Research,
Linder Höhe Köln 51147, Germany
Institute of Solar Research,
Linder Höhe Köln 51147, Germany
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Christoph Hilgert
Christoph Hilgert
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Search for other works by this author on:
Bijan Nouri
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
e-mail: Bijan.nouri@dlr.de
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
e-mail: Bijan.nouri@dlr.de
Marc Röger
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Nicole Janotte
German Aerospace Center (DLR),
Institute of Solar Research,
Linder Höhe Köln 51147, Germany
Institute of Solar Research,
Linder Höhe Köln 51147, Germany
Christoph Hilgert
German Aerospace Center (DLR),
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Institute of Solar Research,
Plataforma Solar de Almería (PSA),
Tabernas 04200, Spain
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 8, 2017; final manuscript received October 11, 2017; published online March 28, 2018. Assoc. Editor: Sandra Boetcher.
J. Thermal Sci. Eng. Appl. Jun 2018, 10(3): 031011 (11 pages)
Published Online: March 28, 2018
Article history
Received:
May 8, 2017
Revised:
October 11, 2017
Citation
Nouri, B., Röger, M., Janotte, N., and Hilgert, C. (March 28, 2018). "Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows." ASME. J. Thermal Sci. Eng. Appl. June 2018; 10(3): 031011. https://doi.org/10.1115/1.4038706
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