A5065465903- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Fluid Dynamics and Heat Transfer
- Electrohydrodynamics and Fluid Dynamics
- Plant Surface Properties and Treatments
- Aerosol Filtration and Electrostatic Precipitation
- Coagulation and Flocculation Studies
- Biodiesel Production and Applications
- Catalytic Processes in Materials Science
- Particle Dynamics in Fluid Flows
- Spectroscopy and Laser Applications
- Inhalation and Respiratory Drug Delivery
- Tissue Engineering and Regenerative Medicine
- Esophageal and GI Pathology
- Gas Dynamics and Kinetic Theory
- Heat transfer and supercritical fluids
- Thermochemical Biomass Conversion Processes
- Mass Spectrometry Techniques and Applications
- Rocket and propulsion systems research
- Surface Modification and Superhydrophobicity
- Electrospun Nanofibers in Biomedical Applications
- nanoparticles nucleation surface interactions
- Advanced Optical Sensing Technologies
- Plasma and Flow Control in Aerodynamics
- Polymer Science and Applications
RWTH Aachen University
2016-2025
Abstract Liquid atomization determines the initial conditions for flame formation and particle synthesis. Without a stable flame, high droplet velocities thus short residence time in may lead to droplets being injected into an extinguished which influences synthesis final output. An experimental investigation of spray stability is performed through high-speed visualization. Targeted variation nozzle geometry applied improve spray-flame interaction compared standardized burner. Timescales...
This study investigates the formation of by-product species during flame spray synthesis (SFS) superparamagnetic maghemite (γ-Fe2O3) nanoparticles. Four samples are synthesized by utilizing two standardized burner types (SpraySyn1 and SpraySyn2) varying iron (III) nonahydrate (INN) concentration (0.1 M 0.2 M) in precursor feed while using ethanol 2-ethylhexanoic acid as solvent. Conducting complementary powder analysis revealed a predominant presence carboxylates carbonates (~14–18 wt.%), no...
<b><i>Background:</i></b> Endobronchial administration of local anesthetics such as lidocaine is often used for cough suppression during bronchoscopy. To achieve a better distribution in the tracheobronchial tree, spray catheters have been developed, allowing nebulization anesthetic solution. However, there are little data on efficacy and safety this approach, or consumption sedative drugs nebulized administration. <b><i>Objectives:</i></b>...
Ballistic imaging commonly denotes the formation of line-of-sight shadowgraphs through turbid media by suppression multiply scattered photons. The technique relies on a femtosecond laser acting as light source for images and switch an optical Kerr gate that separates ballistic photons from ones. achievable image resolution is one major limitation investigation small objects. In this study, practical influences quality are discussed theoretically experimentally applying switching beam with...
Introduction: Inoperable airway stenoses are currently treated by placing stents. A major problem of covered stents is missing mucociliary clearance, which caused covering the native respiratory epithelium. By coating a stent with epithelium, this can be overcome. However, no methods available for efficient endoscopic cell seeding. Methods: We designed flexible spraying device based on bronchoscope and tested it epithelial cells. With cells also applied in thin layer fibrin glue. evaluated...
Coaxial atomization is an established strategy for many stationary combustion systems. While modeling spray formation in coaxial challenging due to the existence of a wide range length and time scales, typical models introduce substantial uncertainty Euler–Lagrange simulations actual application, e.g., flame. To reduce uncertainties, recently proposed multiscale approach adopted realistic applications this work. The uses three one-way coupled simulation domainss that cover internal nozzle...
Fuel-dependent jet breakup was investigated by resolving the microscopic and macroscopic structures of a spray leaving diesel nozzle orifice. Liquid their corresponding velocities were analyzed using light-scattering technique in combination with two-dimensional cross correlation double-frame images. A weighing method has been applied for determination fuel-dependent exit velocity. wide range Reynolds numbers (1700−80,000) gaseous Weber (145−1121) covered means eleven different fuels six...
Abstract The relatively new thermometry technique “pulsed 2cLIF with MDR-enhanced energy transfer” is tested for the first time on micro-droplet streams in a heated air flow. method allows simultaneous measurements of droplet internal temperature-field, size and velocity. Plausibility measurement results evaluated by comparing various experimental conditions among each other comparison analytic modeling. Overall, are plausible. However, measured temperature-fields biased integral...
In-cylinder mixture formation and combustion are highly influenced by primary breakup of injected fuel. Experimentalinvestigation this phenomenon directly at the outlet a diesel injector requires specialized transmitted light microscopy technique combined with constant-pressure flow vessel. The method allows verification existence an intact jet core for various states injection different fuels. is dominated axisymmetric surface waves during initial phase. By quantification wavelengths...
A new design for transparent high-pressure nozzles is presented in this work. This enables using the innovative Selective Laser Etching (SLE) method to manufacture with outstanding accuracy. Therefore, not only simultaneous visualization of flow mechanics inside and outside nozzle enabled, but manufacturing applied also allows realization individual geometries. Thus, internal phenomena (e.g., cavitation, swirl, air inlet) their influence on primary breakup can be analyzed realistic...
This work presents the development of a cavity ring-down spectrometer (CRDS) designed for detection several molecules relevant air pollution, including second overtone ro-vibration transitions from CO at 1.58 µm and NO 1.79 µm. A unique feature this CRDS is use custom mirrors with reflectivity about 99.99% 1.52 to 1.80 µm, enabling efficient laser coupling into while ensuring minimum detectable absorbance 1.1 × 10−10 cm−1 within an integration time 1.2 s. In work, successful implementation...
A new method for instantaneous measurement of temperature, size and velocity micro-droplets has been developed.The is based on the well-known 2-color laser-induced fluorescence (2cLIF) technique, but usesa pulsed laser 2-dimensional imaging without motion blur an adjusted dye mixture suppression LIFMDRsby utilizing MDR-enhanced energy transfer effect. This work presents development steps that arenecessary to verify feasibility 2D-2cLIF-EET micro droplet hollow-cone spray applications.DOI:...
This work presents a novel high-speed interferometric thickness measurement system for thin films (1 μm-23 μm). The is based on Fizeau-interferometer and combines camera 2-D topographic fringe images with spectrally resolved white light interferometer. aim of this combination to overcome the ambiguities phase demodulation process during pattern analysis. able measure spatially temporally film distributions fast processes. error around 5% compared commercial 0-D First, results diesel spray...
A novel spin coating device for producing homogeneous and stable thin oil films under internal combustion (IC) engine−relevant conditions is presented. minimum film thickness of 2 µm achievable, which seems to correspond the found on cylinder walls IC engines. The incorporation into a high-pressure chamber provides both, adjustable ambient access optical measurement techniques. can be equipped with automotive fuel injectors spraying onto films. Oil generation achieved via rotation sapphire...