Two-layer transient heat transfer using impulse response methods

Siroka, Shawn; Berdanier, Reid A.; Thole, Karen A.

doi:10.1016/j.ijheatmasstransfer.2021.122511

Cited by 1 publication

(8 citation statements)

References 19 publications

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“…One available design tool for choosing this parameter is the two-layer analytical solution to the unsteady conduction equation under harmonic heating. The solution to the two-layer harmonic problem outlined by Siroka et al [12] develops the relationship between the temperature amplitude at the defined sensor locations ( T 1 and T 2 ) relative to the surface temperature ( T 0 ): and…”

Section: Gauge Designmentioning

confidence: 99%

“…Third, at the design intent, the T 1 measurement is attenuated from surface conditions due to the coating, by a magnitude of nearly 50%. For this reason, ICHP solutions using inverse methods will be applied to rectify the measured temperature to the true surface temperature [12].…”

Section: Gauge Designmentioning

confidence: 99%

“…In contrast, figure 3 shows the temperature amplitude of the top sensor ( T 1 ) with a periodic heating at the defined frequency, ω BPF , over a range of coating thickness values for three different heating levels. The formulation of this solution was presented by Siroka et al [12] and uses the material properties outlined in table 1. Figure 3 also identifies a representative noise floor (0.15 • C) at the selected BPF for a demonstrative data acquisition system defined here as the combination of HFG signal excitation, filtering, and acquisition.…”

Section: Gauge Designmentioning

confidence: 99%

“…Moreover, attenuated subsurface temperature signals must be rectified to surface conditions through the use of indirect heat conduction problem (IHCP) solutions. Previous work [12] provides guidelines on the design of coated sensors systems capable of utilizing IHCP solutions.…”

Section: Introductionmentioning

confidence: 99%

“…The current study first applies the previous design framework and processing foundation [12] to guide fabrication of coated HFGs specifically designed for use in steady experimental turbine facilities. Then, this work presents calibration procedures with experimental validation of the processing methods.…”

Section: Introductionmentioning

confidence: 99%

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Development of coated heat flux gauges for fast responding measurements

Siroka¹,

Berdanier²,

Thole³

2022

Meas. Sci. Technol.

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Thermal systems often exhibit transient behaviors that have important implications for the operation of the system and can be difficult to predict. For these reasons, experimental testing is often required to ensure system durability requirements are achieved. One important parameter governing the survivability of components in hot, high-stress environments is the heat flux into the part that dictates the temperature distribution for the component. However, sensors required to experimentally characterize heat fluxes in extreme environments must also be resilient. This study presents the development of coated heat transfer gauges capable of robust, high-frequency measurements in turbine research facilities. The addition of a protective coating increases the durability of the gauge, but inherent of that coating is the attenuation of high-frequency temperature penetrations. As a result, this study first outlines the use of analytical solutions to define a gauge design for a specific frequency range and heat transfer, ensuring that subsurface signals can be rectified to surface conditions through inverse methods. Then, the fabrication of polyimide substrate sensors with a parylene-F coating is described. Micro surface heaters added to the custom sensors were used to determine important geometric and thermal properties necessary to calculate accurate surface heat flux. Ultimately, this work shows increased sensor robustness in a turbine test bed and experimentally validates that the frequency response of the fabricated sensors meet the design intent.

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Section: Gauge Designmentioning

confidence: 99%

Section: Gauge Designmentioning

confidence: 99%

Section: Gauge Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations