Merbach, Timo AlexanderTimo AlexanderMerbachNissen, JanJanNissenRiebesehl, FabianFabianRiebesehlRennpferdt, LukasLukasRennpferdtSteuwe, EikeEikeSteuweHoffmann, MarkoMarkoHoffmannKameke, Alexandra vonAlexandra vonKameke2026-09-172026-09-172026-09-17https://hdl.handle.net/11420/61074The TUHH Open Research (TORE) repository contains the raw and processed data underlying the publication "Lagrangian µ-Particle Tracking Velocimetry Analysis of Microscale Flow over Structured Surfaces". The dataset includes experimental particle tracking velocimetry (PTV) data, the design files of the investigated structured surfaces, and the corresponding MATLAB analysis scripts. The study investigates flow over micro- and nanostructured surfaces as a basis for improving (bio)reactor design, with a focus on mass transport near the surface. µ-PTV was used to obtain three-dimensional, time-resolved particle trajectories and velocity fields in a microreactor. The Lagrangian analysis shows that rectangular microgrooves increase particle contact with the wall. In particular, when the microgrooves are oriented perpendicular to the flow. The analysis reveals near-surface phenomena such as particle trapping and localized recirculation that are not captured by averaged Eulerian velocities alone. The dataset is accompanied by a detailed REadMe file and a separate folder structure file, which describe the file organization, the naming conventions used throughout the repository, and how the individual files relate to the results reported in the associated publication.https://creativecommons.org/licenses/by/4.0/Particle Tracking VelocimetryMicrostructureLagrangian analysisMass transfer phenomenaFluid dynamicsTechnology::660: Chemistry; Chemical EngineeringExperimental Data10.15480/882.16568Schlüter, MichaelMichaelSchlüterKameke, Alexandra vonAlexandra vonKameke10.1021/acs.iecr.6c01159