1. Energy Engineering, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
2. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
3. Department of Applied Physics and Electronics, Umeå University, SE-90187 Umeå, Sweden
4. Division of Fluid and Experimental Mechanics, Luleå University of Technology, SE-97187 Luleå, Sweden