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Novel experimental measurement methods I
Nitric-oxide ionization induced Flow Tagging and Imaging for ultra-high-speed velocimetry in hypersonic flows
Boris Leonov, Richard Miles
Abstract: In this presentation, we will discuss a recently developed Molecular Tagging Velocimetry method, Nitric-oxide ionization induced Flow Tagging and Imaging (NiiFTI), and present a few examples of its applications towards ultra-high-speed velocimetry in hypersonic flows. These examples will include near-surface boundary layer profiling in both low-enthalpy and high-enthalpy hypersonic flows, as well as a single-shot velocity and acceleration measurement in a cross-flow configuration.
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Recent advances on the erosion mechanism of cavitating jets
Nobuyuki Fujisawa
Abstract: The purpose of this presentation is to demonstrate the recent advances on the mechanism of cavitating jet erosion by introducing the flow visualization techniques, such as the surface pits visualization, and the shadowgraph, Schlieren and cross-Schlieren techniques as well as the further image analyses. These experimental techniques allow the observation of shockwave formation and the surface distribution of impulsive forces by microjet. Furthermore, the erosion mechanism of cavitating jet was studied by comparing the spatial distributions of cavitating jet and the impulsive forces on the erosion materials.
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Direct Measurement of Heat Transfer Coefficients on a Heated Cylinder in Cross-Flow Using ALTPs
Claudia Hofmann, Pavel Antoš, Tim Rödiger
Abstract: This study presents a novel approach to directly measuring heat transfer coefficients on a heated cylinder in cross-flow using the ALTP (Active Layer Temperature and Heat Flux) sensor. The experiments focus on forced convection, with the objective of investigating local heat transfer behavior. The ALTP sensor, capable of simultaneous temperature and heat flux measurements, enables precise calculation of the Nusselt number, offering insights into the impact of flow dynamics, such as boundary layer separation and wake flow, on heat transfer. Preliminary results reveal symmetric heat flux patterns with notable fluctuations linked to flow features, providing a foundation for further studies, including spectral analyses and numerical validation.
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