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Session: Novel experimental measurement methods II
Session starts: Tuesday 04 November, 14:50
Presentation starts: 14:50
Room: Lecture room A

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Simon Kaneider (Landshut University of Applied Sciences)
Tim Roediger (Landshut University of Applied Sciences)

Abstract:
Atomic layer thermopile (ALTP) sensors provide a temporal resolution in the microsecond range for direct heat flux measurements, yet spatial resolution has remained limited due to the size of individual sensor modules. To address this, we present a novel linear sensor array composed of ALTPs with millimetre-scale spatial resolution. This work details the design and calibration of the sensor array, including sensor separation, electrical integration, and signal amplification. Static and dynamic calibration procedures are described, and the performance of the array is demonstrated in a subsonic stagnation point jet impingement test case - a flow scenario characterised by steep radial heat flux gradients and transient behaviour. The sensor array enables simultaneous, high-resolution measurements of heat flux and temperature across the stagnation region, facilitating the calculation of local heat transfer coefficients and Nusselt numbers. This enhanced spatial resolution supports improved experimental analysis in complex flow environments such as impingement cooling, laminar-turbulent transition, and shock wave/boundary layer interaction (SBLI), potentially providing new insights for the validation and refinement of numerical heat transfer models.