1. Chair for Fluid Dynamics, Institute for Combustion and Gas Dynamics (IVG), University of Duisburg-Essen, Carl-Benz Straße 199, 47057 Duisburg, Germany
2. Center for Nano-Integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Carl-Benz Straße 199, 47057 Duisburg, Germany