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Item type:Research Data, Access status: with files , Data and Supplementary Information for publication: An Experimental Study on the Time Dependence of Diffusive Mass Transfer of Single Oxygen Bubbles(2026-07-30); ; ; ; Data supplement for publication: "An Experimental Study on the Time Dependence of Diffusive Mass Transfer of Single Oxygen Bubbles" ------------------------------------------------------------ Publication Information ------------------------------------------------------------ Title: An Experimental Study on the Time Dependence of Diffusive Mass Transfer of Single Oxygen Bubbles Keywords: gas-liquid mass Transfer, Sherwood number, PLIF, LSFM Authors: Lotta Kursula - 0009-0006-6587-2709 Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany Sayaka Takagi Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany Felix Kexel - 0000-0003-4268-2348 Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany Marko Hoffmann Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany Michael Schlüter - 0000-0001-5969-2150 Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany DOI of publication: DOI of data supplement: https://doi.org/10.15480/882.17032 License: Public Domain Mark 1.0 Universal Abstract of the paper: In the vast majority of gas-liquid engineering applications, the liquid phase contains a range of dissolved gaseous species. These dissolved process gases transfer from the liquid phase to the gaseous phase countercurrent to the typically desired mass transfer of gas to liquid. In process design, the resulting change in the composition of the gaseous phase is usually neglected, although a temporal change in the composition of the gaseous phase can directly influence the mass transfer performance over time. The current fundamental study quantifies the mass transfer performance of oxygen bubbles to liquid phases saturated with another gas. For this purpose, the oxygen mass transfer from a bubble to degassed, helium-, nitrogen-, argon- and carbon dioxide-saturated water is studied. Light Sheet Fluorescence Microscopy is used as imaging system for Planar Laser-induced Fluorescence measurements of dissolved oxygen concentration fields, delivering local instantaneous Sherwood numbers, diffusion coefficients and mass Transfer coefficients. For the first time, the study showcases that the mass transfer performance from a gaseous dispersed to a liquid continuous phase is independent of time if mass transfer occurs in one direction only. If mass transfer occurs in both directions, the mass transfer performance of the dispersed phase is significantly lower and its time dependence higher to liquids containing gaseous species with high solubilities, such as carbon dioxide in water. Furthermore, the results suggest that applying intrinsic values, such as diffusion or mass transfer coefficients, obtained for binary systems in multicomponent systems can lead to high uncertainty.Data Type: Dataset33 49 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Supplementary Information for publication: Experimental studies on microscopic, multiphase transport phenomena: Novel applications of light sheet fluorescence microscopy(2026-03-10); ; ; ; Over the past two decades, light sheet fluorescence microscopy has developed to a powerful tool for studies of dynamics in biological systems. In a new development, we apply light sheet fluorescence microscopy as a novel experimental measurement technology within the field of multiphase process engineering and fluid dynamics. The technology enables a number of novel studies of single- and multiphase transport phenomena on a microscopic scale. In the current publication, we introduce the first implementation of light sheet fluorescence microscopy in the field and demonstrate its applicability on one exemplary measurement of diffusive oxygen mass transfer from an oxygen bubble to degassed water. The results prove that such measurements can be conducted with a high spatial resolution with a submicron pixel pitch and enable precise studies on microscopic transport phenomena. Besides measurements of mass transfer, on which we lay the focus here, light sheet fluorescence microscopy further enables studies of fluid dynamics on a microscopic scale.Data Type: Dataset27 16 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Data for publication: Experimental studies on microscopic, multiphase transport phenomena: Novel applications of light sheet fluorescence microscopy(2026-03-10); ; ; ; Over the past two decades, light sheet fluorescence microscopy has developed to a powerful tool for studies of dynamics in biological systems. In a new development, we apply light sheet fluorescence microscopy as a novel experimental measurement technology within the field of multiphase process engineering and fluid dynamics. The technology enables a number of novel studies of single- and multiphase transport phenomena on a microscopic scale. In the current publication, we introduce the first implementation of light sheet fluorescence microscopy in the field and demonstrate its applicability on one exemplary measurement of diffusive oxygen mass transfer from an oxygen bubble to degassed water. The results prove that such measurements can be conducted with a high spatial resolution with a submicron pixel pitch and enable precise studies on microscopic transport phenomena. Besides measurements of mass transfer, on which we lay the focus here, light sheet fluorescence microscopy further enables studies of fluid dynamics on a microscopic scale.Data Type: Experimental Data45 45 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Data supplement for publication: Wireless and passive pressure detection using magneto-mechanical resonances in process engineering(2025-07-29); ; ; ; The TUHH Open Research (TORE) repository entails the raw files and the result files for the publication "Wireless and passive pressure detection using magneto-mechanical resonances in process engineering". A custom-developed magneto-mechanical resonator (MMR) for wireless pressure measurement is investigated for potential applications in process engineering. The MMR sensor utilises changes in the resonance frequency caused by pressure on a flexible 3D printed membrane. The thickness of the printed membrane plays a crucial role in determining the performance and sensitivity of MMRs, and can be tailored to meet the requirements of specific applications. The study includes static and dynamic measurements to determine the pressure sensitivity and temporal resolution of the sensor. The results show a minimum sensitivity of 0.06 Hz/mbar and are in agreement with theoretical calculations and measurements. The maximum sensor readout frequency is 2 Hz in this study. Additionally, the temperature dependence of the sensor is investigated, revealing a significant dependence of the resonance frequency on temperature. The developed MMR offers a promising and versatile method for precise pressure measurements in process engineering environments.Data Type: Experimental Data169 181