Sebastian A. Kaiser
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View article: In-cylinder flow–flame interactions in a production engine via combined endoscopic PIV and high-speed chemiluminescence imaging
In-cylinder flow–flame interactions in a production engine via combined endoscopic PIV and high-speed chemiluminescence imaging Open
View article: Near-wall dynamics of single cavitation bubbles imaged by total internal reflection fluorescence
Near-wall dynamics of single cavitation bubbles imaged by total internal reflection fluorescence Open
View article: In-service and repair welding of pressurized hydrogen pipelines–a review on current challenges and strategies
In-service and repair welding of pressurized hydrogen pipelines–a review on current challenges and strategies Open
Hydrogen is the energy carrier for a sustainable future without fossil fuels. As this requires a reliable transportation infrastructure, the conversion of existing natural gas (NG) grids is an essential part of the worldwide individual nat…
View article: Frictional and Particle Emission Behavior of Different Brake Disk Concepts Correlated with Optical Pin Surface Characterization
Frictional and Particle Emission Behavior of Different Brake Disk Concepts Correlated with Optical Pin Surface Characterization Open
Brake wear emissions can be reduced by altering the surface of brake disks. A parametric study using a gray cast iron and a laser-cladded brake disk was performed in a pin-on-disk experiment with integrated optical pin surface characteriza…
View article: Phase changes in burning precursor-laden single droplets leading to puffing and micro-explosion
Phase changes in burning precursor-laden single droplets leading to puffing and micro-explosion Open
When producing metal-oxide nanoparticles via flame spray pyrolysis, precursor-laden droplets are ignited and undergo thermally induced disintegration, called ‘puffing’ and ‘micro-explosion’. In a manner that is not fully understood, these …
View article: Impedance-Based Method for Predictive Stability Assessment
Impedance-Based Method for Predictive Stability Assessment Open
Impedance-based analysis methods enable a more specific and earlier foundation for assessing harmonic stability in decentralized converter-based power plants compared to the conventional compliance testing in the grid connection process. E…
View article: Single-Bubble Cavitation-Induced Pitting on Technical Alloys
Single-Bubble Cavitation-Induced Pitting on Technical Alloys Open
Repeated single cavitation bubble experiments were performed primarily on 316L stainless steel, and some on nickel–aluminum–bronze (NAB) and pure aluminum. The bubble dynamics were recorded with two high-speed cameras and correlated with s…
View article: Laser-induced emission from iron oxide nanoparticles in spray-flame synthesis: in situ high-speed microscopy
Laser-induced emission from iron oxide nanoparticles in spray-flame synthesis: in situ high-speed microscopy Open
Spray-flame synthesis uses low-cost precursors dissolved in organic solvents to produce functional metaloxide nanoparticles. In the spray flame, the precursor-laden droplets show frequent and intense thermally-induced disruption, so-called…
View article: Statistical analysis of flow field variations via independent component analysis
Statistical analysis of flow field variations via independent component analysis Open
The link between in-cylinder flow and subsequent combustion in a single-cylinder gasoline spark-ignition engine is analyzed via independent component analysis (ICA). Experimentally, the two in-plane components of the velocity are measured …
View article: Neural networks for classification and segmentation of thermally-induced droplet breakup in spray-flame synthesis
Neural networks for classification and segmentation of thermally-induced droplet breakup in spray-flame synthesis Open
Spray-flame synthesis (SFS) enables one-step production of functional metal-oxide nanoparticles from inexpensive precursors such as metal salts. Precursor-laden droplets show thermally-induced breakup, i.e., puffing and micro-explosion, co…
View article: Imaging of flame propagation and temperature distribution in an all-metal gasoline engine with endoscopic access via anisole fluorescence
Imaging of flame propagation and temperature distribution in an all-metal gasoline engine with endoscopic access via anisole fluorescence Open
Laser-based optical diagnostic tools are widely used to investigate in-cylinder processes in internal combustion engines. For laser-induced fluorescence (LIF), many tracers have been used in the past. Recently, anisole has been characteriz…
View article: Statistical analysis of flow field variations via independent component analysis
Statistical analysis of flow field variations via independent component analysis Open
The link between in-cylinder flow and subsequent combustion in a single-cylinder gasoline spark-ignition (SI) engine operating slightly lean is analyzed via independent component analysis (ICA). Experimentally, the two in-plane components …
View article: High-speed imaging and statistics of puffing and micro-exploding droplets in spray-flame synthesis
High-speed imaging and statistics of puffing and micro-exploding droplets in spray-flame synthesis Open
Thermally-induced breakup of metal-precursor-laden droplets in spray-flame synthesis occurs via a rapid and disruptive disintegration, i.e., “puffing” and “micro-explosion”. To assess the temporal evolution and statistics of droplet disrup…
View article: A population balance method for simulation of particle-induced droplet breakup in spray flame synthesis and suspension spray combustion
A population balance method for simulation of particle-induced droplet breakup in spray flame synthesis and suspension spray combustion Open
A population balance method based on weighted Monte-Carlo droplets is used to investigate breakup phenomena in single droplet combustion and spray flame synthesis (SFS). Particle shell formation in conjunction with superheating of liquid c…
View article: Optical Investigation of Mixture Formation in a Hydrogen-Fueled Heavy-Duty Engine with Direct-Injection
Optical Investigation of Mixture Formation in a Hydrogen-Fueled Heavy-Duty Engine with Direct-Injection Open
Mixture formation in a hydrogen-fueled heavy-duty engine with direct injection and a nearly-quiescent top-hat combustion chamber was investigated using laser-induced fluorescence imaging, with 1,4-difluorobenzene serving as a fluorescent t…
View article: Special issue on “Piston Engines as Chemical Reactors”
Special issue on “Piston Engines as Chemical Reactors” Open
View article: Does cluster encapsulation inhibit sintering? Stabilization of size-selected Pt clusters on Fe$_3$O$_4$(001) by SMSI
Does cluster encapsulation inhibit sintering? Stabilization of size-selected Pt clusters on Fe$_3$O$_4$(001) by SMSI Open
The metastability of supported metal nanoparticles limits their application in heterogeneous catalysis at elevated temperatures due to their tendency to sinter. One strategy to overcome these thermodynamic limits on reducible oxide support…
View article: Evaluation of fuel additives for HCCI engines operated on fuel-rich methane/air mixtures: DME, DEE, and n-heptane
Evaluation of fuel additives for HCCI engines operated on fuel-rich methane/air mixtures: DME, DEE, and n-heptane Open
Piston engines can be operated with very fuel-rich fuel/air mixtures to simultaneously produce syngas, power, and heat – so-called “polygeneration”. In this context, the effects of methoxymethane (dimethyl ether, DME), ethoxyethane (diethy…
View article: Evolution Inspired Engineering of Megasynthetases
Evolution Inspired Engineering of Megasynthetases Open
Many clinically used drugs are derived from or inspired by bacterial natural products that often are biosynthesised via non-ribosomal peptide synthetases (NRPS), giant megasynthases that activate and join individual amino acids in an assem…
View article: In-situ Investigation of the Onset of Cavitation Damage from Single Bubbles on Technical Alloys
In-situ Investigation of the Onset of Cavitation Damage from Single Bubbles on Technical Alloys Open
Cavitation erosion is typically studied with ultrasonic sonotrodes. Only a few attempts have been made to study cavitation erosion of technical alloys on the level of repeated single bubbles. Such single cavitation bubbles can be induced b…
View article: Cyclic Variations in the Flame Propagation in an Spark-Ignited Engine: Multi Cycle Large Eddy Simulation Supported by Imaging Diagnostics
Cyclic Variations in the Flame Propagation in an Spark-Ignited Engine: Multi Cycle Large Eddy Simulation Supported by Imaging Diagnostics Open
Experimental measurements and multi-cycle large eddy simulation (LES) are performed in an optically accessible four-stroke spark-ignition engine to investigate cycle-to-cycle variations (CCV). High-speed combustion imaging is used to measu…
View article: Optical Investigation of the Influence of In-cylinder Flow and Mixture Inhomogeneity on Cyclic Variability in a Direct-Injection Spark Ignition Engine
Optical Investigation of the Influence of In-cylinder Flow and Mixture Inhomogeneity on Cyclic Variability in a Direct-Injection Spark Ignition Engine Open
In this study, a single-cylinder direct-injection spark-ignition research engine with full optical access was used to investigate the influence of the flow field and fuel/air mixing on cyclic variability, in particular in the early flame p…
View article: Correction to: Visualization and image analysis of droplet puffing and micro-explosion in spray-flame synthesis of iron oxide nanoparticles
Correction to: Visualization and image analysis of droplet puffing and micro-explosion in spray-flame synthesis of iron oxide nanoparticles Open
After publication in Vol 63 Issue 3, it was noticed that there is a white dot that appears in the graphical abstract in the original publication of the article. The revised version of the graphical abstract is given below:
View article: Visualization and image analysis of droplet puffing and micro-explosion in spray-flame synthesis of iron oxide nanoparticles
Visualization and image analysis of droplet puffing and micro-explosion in spray-flame synthesis of iron oxide nanoparticles Open
Combusting metal precursor-laden droplets, required in spray-flame synthesis of nanomaterials, are known to undergo a rapid and disruptive disintegration, i.e., puffing and micro-explosion. In this work, imaging with high spatiotemporal re…
View article: Close-to-process compensation of geometric deviations on implants based on optical measurement data
Close-to-process compensation of geometric deviations on implants based on optical measurement data Open
View article: Remaining Time Prediction for Processes with Inter-case Dynamics
Remaining Time Prediction for Processes with Inter-case Dynamics Open
Process mining techniques use event data to describe business processes, where the provided insights are used for predicting processes’ future states ( Predictive Process Monitoring ). Remaining Time Prediction of process instances is an i…
View article: Evaluation of Fuel Additives for Hcci Engines Operated on Fuel-Rich Methane/Air Mixtures: Dme, Dee, and N-Heptane
Evaluation of Fuel Additives for Hcci Engines Operated on Fuel-Rich Methane/Air Mixtures: Dme, Dee, and N-Heptane Open
View article: Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption
Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption Open
Water films and droplets on surfaces are important in the design of various processes.In the present work, two complementary non-invasive imaging techniques, laser-induced fluorescence (LIF) and near-infrared absorption (NIRA), were used s…
View article: Quantitative UV-absorption imaging of liquid fuel films and their evaporation
Quantitative UV-absorption imaging of liquid fuel films and their evaporation Open
Spray impingement and the resulting liquid fuel films are main causes of soot emissions in gasoline direct-injection (GDI) engines.This work presents an experimental investigation of liquid fuel-film formation and evaporation with UV-absor…
View article: Experimental and numerical investigation of evaporating fuel films in combustion
Experimental and numerical investigation of evaporating fuel films in combustion Open