A5064267058- Heat Transfer and Boiling Studies
- Fluid Dynamics and Mixing
- Fluid Dynamics and Heat Transfer
- Spacecraft and Cryogenic Technologies
- Fluid Dynamics and Thin Films
- Electrohydrodynamics and Fluid Dynamics
- Surface Modification and Superhydrophobicity
- Nanomaterials and Printing Technologies
- nanoparticles nucleation surface interactions
- Heat Transfer and Optimization
- Heat Transfer Mechanisms
- Thermography and Photoacoustic Techniques
- Metallurgical Processes and Thermodynamics
- Additive Manufacturing and 3D Printing Technologies
- Calibration and Measurement Techniques
- Innovative Microfluidic and Catalytic Techniques Innovation
- Thermal Analysis in Power Transmission
- Semiconductor Lasers and Optical Devices
- Physics and Engineering Research Articles
- Image and Object Detection Techniques
- Medical Image Segmentation Techniques
- Infrared Target Detection Methodologies
- Engineering and Materials Science Studies
- European history and politics
- High Entropy Alloys Studies
Technical University of Darmstadt
2013-2024
This publication lays the foundation for description of Multiscale Boiling Experiment, which was conducted within two measurement campaigns on International Space Station between 2019 and 2021. The experiment addresses fundamental questions about two-phase heat transfer during boiling processes. For this purpose, single or few subsequential bubbles are selectively ignited a heated substrate using short laser pulse. A detailed investigation phenomena is possible, as process temporally slowed...
We present the results of a study aimed at investigating effects electric fields on quasi-static bubble departure dynamics during pool boiling perfluorohexane (FC-72) in microgravity conditions. Analysis was performed through an alternative formulation momentum balance which contribution non-uniform stress distributions interface can be quantified high-speed video measurements without having to numerically solve laws electrostatics. Data used this were obtained scope Multiscale Boiling...
Boiling is one of the most effective heat transfer mechanisms. In spite a long time research, physical fundamentals are still not sufficiently understood. Pursuing objective to predict based on and geometrical properties, experimental numerical investigations conducted at institute authors. The focus presented research coalescence two single bubbles under varying pressure conditions. experiment thin stainless-steel foil used as Joule heater. experiments were performed in range 300–1000 mbar...
This study focuses on the influence of system pressure pool boiling regimes a microstructured surface compared to smooth surface. The consists copper wires with diameters and lengths 1 20 µm, respectively. saturation FC-72 is varied between 0.5 1.8 bar. Boiling curves are determined those results show no distinctive dependency, contrary being in good agreement state-of-the-art correlation. exhibits higher heat transfer coefficients lower critical fluxes than Nukiyama-curves suggest existence...
Laser powder bed fusion enables the fabrication of complex components such as thin-walled cellular structures including lattice or honeycomb structures. Numerous manufacturing parameters are involved in resulting properties fabricated component and a material machine-dependent process window development is necessary to determine suitable map. For thickness, which correlates with parameters, directly influences mechanical component. Thus, dimensionless scaling laws describing correlation...
We present a calibration method for the measurement of temperature using infrared cameras that enables high-accuracy thermography moving targets with locally varying emissivity. Correlation-based image matching techniques are applied to calculate position-dependent functions sub-pixel accuracy. The is described in detail and demonstrated an experimental setup consisting rotating cube. uncertainty analysed comparison conventional pixel-wise situ used non-moving measurements. An analysis...
We report transient heat flux calculations based on temperature measurements during dip-coating of a superheated substrate. During the withdrawal substrate from pool volatile liquid, film finite length forms substrate's surface, locally reducing due to evaporation. The surface solid is measured using high-resolution infrared thermography and used as boundary condition calculate profiles at interface between fluid. shapes these are analyzed with special focus local in thin region near...
Abstract For the present study numerical simulations of subcooled flow boiling FC-72 in microgravity have been conducted to accompany experiments performed on International Space Station (ISS). The domain represents geometry experimental test cell. all open source framework OpenFOAM was employed, including extensions interFoam solver, which developed at authors’ institute. A reference case has defined applying intermediate values from parameter range as system parameters. This examined...
Infrared thermometry is a widely used technique for contactless temperature measurement, which often conducted through semi-transparent media. In the present work, influences on measurement results stemming from media and optical characteristics of setup are discussed. Results two experimental setups, containing low, medium, high transmission presented compared to calculated data using one-dimensional analytical approach three-dimensional ray-tracing algorithm. It shown modeling experiments...
The formation of liquid microlayers during the dewetting a hot surface has significant effects on heat transfer in boiling and evaporation processes. Understanding criteria for such is crucial explaining characteristics, particular coefficient (HTC). Research this area been almost exclusively concerned with study pure liquids, but not specific behavior binary mixtures used numerous As an example, we investigate ethanol water mixtures, whose global widely studied. We conducted experiments as...
Abstract The Volume-of-Fluid (VOF) method is commonly used for numerical simulations of phase change phenomena, such as nucleate boiling or droplet evaporation. A key issue with the standard VOF averaging liquid and vapor properties in interface cells, which causes non-physical conjugate heat transfer a solid wall. Therefore, we aim at physical model between multiphase fluid. first measure higher quality splitting single temperature field fluid region into separate fields. second development...