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Application of 3-omega method for thin-film heat flux gauge calibration.

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Title: Application of 3-omega method for thin-film heat flux gauge calibration.
Authors: Siroka, Shawn1 (AUTHOR) sis5702@psu.edu, Foley, Brian M (AUTHOR), Berdanier, Reid A (AUTHOR), Thole, Karen A (AUTHOR)
Source: Measurement Science & Technology. Nov2021, Vol. 32 Issue 11, p1-12. 12p.
Subjects: Heat flux, Temperature detectors, Calibration, Gages, Dielectric properties, Thermal properties
Abstract: Double-sided thin-film resistance temperature detector (RTD) heat flux gauges (HFGs) are commonly used to characterize heat transfer rates in high-heat flux environments with complex flow features. These gauges comprise two thin-film RTDs on opposing sides of a dielectric. To deduce accurate heat flux, the RTDs must be properly calibrated and the material properties of the dielectric must be characterized. This study presents a complete gauge characterization method for sensors of this type by applying standard calibration procedures with specially-designed RTDs capable of utilizing the 3-omega method. The 3-omega method quantifies the thermal conductivity and thermal product of a material by measuring the response of a specially designed heater/thermometer deposited on the substrate. This study shows the 3-omega method enables RTD calibrations and thermal property determination over a range of temperatures for individual gauges, reducing the uncertainty in calculated heat flux. Although the method is quite general, this study utilized platinum RTDs with a polyimide dielectric, which is common in turbomachinery applications. The thermal properties obtained through this method agree with previous characterization efforts; however, discrete characterization of seven gauges shows that gauge-to-gauge variation in the dielectric could influence measured heat flux by as much as 30%. This study also builds the framework to characterize the thermal conductivity of the adhesive layer beneath the gauge which is necessary to mount the sensors to the test article. Although often uncharacterized, the adhesive thermal conductivity has a significant impact on matching experimental measurements to simulations. Additionally, this study found that if the thermal conductivity of the dielectric is constant (an assumption that holds for the present study), an in-situ RTD calibration can be performed. In-situ RTD calibration and traditional method RTD calibration agreed to within 0.1%. Overall, this work has practical implications in obtaining high quality measurements from HFGs of this type. [ABSTRACT FROM AUTHOR]
Copyright of Measurement Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 152818240
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  Data: Application of 3-omega method for thin-film heat flux gauge calibration.
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  Data: <searchLink fieldCode="AR" term="%22Siroka%2C+Shawn%22">Siroka, Shawn</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sis5702@psu.edu</i><br /><searchLink fieldCode="AR" term="%22Foley%2C+Brian+M%22">Foley, Brian M</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Berdanier%2C+Reid+A%22">Berdanier, Reid A</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thole%2C+Karen+A%22">Thole, Karen A</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Measurement+Science+%26+Technology%22">Measurement Science & Technology</searchLink>. Nov2021, Vol. 32 Issue 11, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+detectors%22">Temperature detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Calibration%22">Calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Gages%22">Gages</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+properties%22">Dielectric properties</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Double-sided thin-film resistance temperature detector (RTD) heat flux gauges (HFGs) are commonly used to characterize heat transfer rates in high-heat flux environments with complex flow features. These gauges comprise two thin-film RTDs on opposing sides of a dielectric. To deduce accurate heat flux, the RTDs must be properly calibrated and the material properties of the dielectric must be characterized. This study presents a complete gauge characterization method for sensors of this type by applying standard calibration procedures with specially-designed RTDs capable of utilizing the 3-omega method. The 3-omega method quantifies the thermal conductivity and thermal product of a material by measuring the response of a specially designed heater/thermometer deposited on the substrate. This study shows the 3-omega method enables RTD calibrations and thermal property determination over a range of temperatures for individual gauges, reducing the uncertainty in calculated heat flux. Although the method is quite general, this study utilized platinum RTDs with a polyimide dielectric, which is common in turbomachinery applications. The thermal properties obtained through this method agree with previous characterization efforts; however, discrete characterization of seven gauges shows that gauge-to-gauge variation in the dielectric could influence measured heat flux by as much as 30%. This study also builds the framework to characterize the thermal conductivity of the adhesive layer beneath the gauge which is necessary to mount the sensors to the test article. Although often uncharacterized, the adhesive thermal conductivity has a significant impact on matching experimental measurements to simulations. Additionally, this study found that if the thermal conductivity of the dielectric is constant (an assumption that holds for the present study), an in-situ RTD calibration can be performed. In-situ RTD calibration and traditional method RTD calibration agreed to within 0.1%. Overall, this work has practical implications in obtaining high quality measurements from HFGs of this type. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Measurement Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6501/ac0f23
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      – Code: eng
        Text: English
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        PageCount: 12
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    Subjects:
      – SubjectFull: Heat flux
        Type: general
      – SubjectFull: Temperature detectors
        Type: general
      – SubjectFull: Calibration
        Type: general
      – SubjectFull: Gages
        Type: general
      – SubjectFull: Dielectric properties
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      – SubjectFull: Thermal properties
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      – TitleFull: Application of 3-omega method for thin-film heat flux gauge calibration.
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            NameFull: Siroka, Shawn
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            NameFull: Foley, Brian M
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            NameFull: Berdanier, Reid A
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            – D: 01
              M: 11
              Text: Nov2021
              Type: published
              Y: 2021
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