Johannes Palmer

Johannes Palmer
RWTH Aachen University · Institute of Heat and Mass Transfer

Dipl.-Ing. Dipl.-Wirt.-Ing.

About

25
Publications
2,862
Reads
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260
Citations
Citations since 2016
18 Research Items
246 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
May 2020 - present
ACCURE Battery Intelligence GmbH
Position
  • COO & Co-Founder
January 2013 - April 2020
RWTH Aachen University
Position
  • Researcher
Education
January 2013 - October 2019
RWTH Aachen University
Field of study
  • Mechanical Engineering

Publications

Publications (25)
Article
In global efforts to reduce harmful greenhouse gas emissions from the transportation sector, novel bio-hybrid liquid fuels from renewable energy and carbon sources can be a major form of energy for future propulsion systems due to their high energy density. A fundamental understanding of the spray and mixing performance of the new fuel candidates i...
Preprint
Full-text available
In global efforts to reduce harmful greenhouse gas emissions from the transport sector, novel bio-hybrid liquid fuels from renewable energy and carbon sources can be a major form of energy for future propulsion systems due to their high energy density. A fundamental understanding of the spray and mixing performance of the new fuel candidates in com...
Conference Paper
Full-text available
Within the Cluster of Excellence - “The Fuel Science Center,” we develop a predictive simulation process for the screening of novel bio-hybrid fuel candidates. Beginning from the molecular structure of the fuel, the thermo-physical properties are predicted, which are then used in a spray model to predict mixing. The ignition delay times and emissio...
Article
Full-text available
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. The method allows simultaneous measurements of the droplet internal temperature-field, droplet size and droplet velocity. Plausibility of the measurement results is evaluated by compar...
Article
Full-text available
This work presents “pulsed 2D-3cLIF-EET” as a measurement setup for micro-droplet internal temperature imaging. The setup relies on a third color channel that allows correcting spatially changing energy transfer rates between the two applied fluorescent dyes. First measurement results are compared with results of two slightly different versions of...
Article
Full-text available
A new measurement system called “pulsed 2D-2cLIF-EET” has been developed to study temperature fields inside micro-droplets. Pulsed fluorescence excitation allows motion blur suppression and thus simultaneous measurement of droplet size and temperature. Occurrence of morphology-dependent resonances and subsequent stimulated dye emission are accounte...
Conference Paper
Full-text available
A new method for instantaneous measurement of temperature, size and velocity of micro-droplets has been developed.The method is based on the well-known 2-color laser-induced fluorescence (2cLIF) technique, but usesa pulsed laser for 2-dimensional imaging without motion blur and an adjusted dye mixture for suppression of LIFMDRsby utilizing the MDR-...
Conference Paper
Full-text available
In-cylinder mixture formation and combustion are highly influenced by primary breakup of injected fuel. Experimentalinvestigation of this phenomenon directly at the outlet of a diesel injector requires a specialized transmitted light microscopy technique combined with a constant-pressure flow microscopy vessel. The method allows verification of the...
Article
A microscopic system, consisting of a transmitted light microscope and constant-pressure flow vessel, is specifically designed to enable highly resolved high-pressure primary breakup investigations at engine-like densities. At first mea-surements diesel and two alternative fuels are injected with a standard diesel injector at different ambient pres...
Article
Full-text available
In this work, a new measurement system is presented for studying temperature of micro-droplets by pulsed 2-color laser-induced fluorescence. Pulsed fluorescence excitation allows motion blur suppression and thus simultaneous measurements of droplet size, velocity and temperature. However, high excitation intensities of pulsed lasers lead to morphol...
Conference Paper
Full-text available
Stem cell therapy at diseased tissue requires high local stem cell concentrations. The state of the art of cell therapy, the intravenous stem cell transplantation, unfortunately leads to distribution of cells within the entire body. An innovative approach aims at high local cell concentrations based on a minimal invasive surgery through flexible en...
Conference Paper
The underlying physics of jet breakup is hardly understood due to lack of experimental data. Especially in case of increased ambient densities, optical techniques suffer from obstruction of transmitted light in the near field of optically dense sprays. The inner jet region cannot be analyzed on the basis of conventional highly resolving microscopic...
Article
Full-text available
Background: Inoperable airway stenoses are currently treated by placing stents. A major problem of covered stents is missing mucociliary clearance which is caused by covering the native respiratory epithelium. By coating a stent with respiratory epithelium, this problem can be overcome. However, no methods are available for efficient endoscopic ce...
Article
We propose an agent-based model to simulate how changes to the Italian support scheme will affect the diffusion of PV systems among single-or two-family homes. The adoption decision is assumed to be influenced by (1) the payback period of the investment, (2) its environmental benefit, (3) the household's income, and (4) communication with other age...
Article
Full-text available
Ballistic imaging commonly denotes the formation of line-of-sight shadowgraphs through turbid media by suppression of multiply scattered photons. The technique relies on a femtosecond laser acting as light source for the images and as switch for an optical Kerr gate that separates ballistic photons from multiply scattered ones. The achievable image...
Conference Paper
Full-text available
Two fundamental processes inside the cylinder of internal combustion engines govern the applicability of novel biofuels: mixing and combustion. Mixing means the formation of a gaseous air-fuel mixture, which incorporates the sub-processes of injection, spray formation, evaporation and in-cylinder gas flow. Seven complementary projects of the TMFB C...
Article
We propose an agent-based model to simulate the diffusion of small PV systems among single- or two-family homes in Italy over the 2006-2026 period. To this end,we explicitly model the geographical distribution of the agents in order to account for regional differences across the country. The adoption decision is assumed to be influenced predominant...

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Projects

Project (1)
Project
Establish innovative and sustainable processes for the conversion of whole plants into fuels which are tailor-made for novel low-temperature combustion engine processes with high efficiency and low pollutant emissions, paving the way to the 3rd generation of biofuels.