1. Division of Experimental Mechanics, Luleå University of Technology, Luleå 97187, Sweden
2. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
3. Contamination and Core CFD, Volvo Car Corporation, SE-405 31 Gothenburg, Sweden
4. Technical Analysis, Fluid Mechanics, AFRY, Gothenburg 412 63, Sweden