Temporal and Spatial Experimental Investigationon Thin Shear-Driven Fluid Films underTurbomachinery Conditions

Temporal and Spatial Experimental Investigationon Thin Shear-Driven Fluid Films underTurbomachinery Conditions | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Temporal and Spatial Experimental Investigationon Thin Shear-Driven Fluid Films underTurbomachinery Conditions Jonas Harald Ruesch, Paul Jonathan Behn, Eric Nied, Markus Schatz, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5872522/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 21 Oct, 2025 Read the published version in CEAS Aeronautical Journal → Version 1 posted You are reading this latest preprint version Abstract Thin shear stress-driven water films can be found in a wide variety of applications, such as heat exchangers,low-pressure stages of steam turbines or in compressors in the case of high fogging. In aviation, sheardriven water films are of interest in icing phenomena and heavy rain events, among others, as they pose aserious safety risk. The challenge in researching these films is the complex relationship between the turbulent boundary layer and the three-dimensional wavy film, as they influence each other. However, available literature mostly features time resolved but localized pointwise measurements of film behavior. Moreover, experimentsare often done in low-speed gas flows, which are not characteristic for turbomachinery applications. In thispaper, shear-driven water films are investigated in a new experimental test rig, which allows temporal andspatial resolution of films under turbomachinery-like conditions. The test rig can be operated at gas velocities exceeding 100 m/s and has a measuring section consisting of a 0.3 m wide rectangular duct with variableheight. Optical access to the measuring section is provided from both top and bottom side. Flow velocity profiles and turbulence intensities were obtained using 3D Laser Doppler Anemometry (LDA). The sheardriven water films were investigated with a novel light absorption measurement technique that allows films tobe recorded both temporally and spatially resolved, allowing to identify and investigate the wavy film structure.The technique is based on the light absorption of a water-ink mixture, which is illuminated by a white lightsource. The light intensity attenuation, which increases with film thickness and ink concentration, is recordedby a high-speed camera. The measurement technique was used to investigate the films behavior for variousair velocities and film Reynolds numbers. Shear driven water film Multiphase flow Light absorption technique Laser Doppler Anemometry Full Text Additional Declarations No competing interests reported. Supplementary Files FIG11vg75Ref120.gif FIG12vg100Ref25.gif FIG13vg12Ref25.gif Cite Share Download PDF Status: Published Journal Publication published 21 Oct, 2025 Read the published version in CEAS Aeronautical Journal → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5872522","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":436293508,"identity":"9d11acc4-6880-4da8-9ad9-710cc33e8284","order_by":0,"name":"Jonas Harald 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