1. Fluid Mechanics Group/LITEC-CSIC (Spanish Council for Scientific Research), University of Zaragoza, Maria de Luna 10, 50018 Zaragoza, Spain, CHEC Research Centre, Department of Chemical Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark, Danish Technological Institute, Kongsvang Allé 29, DK-8000 Aarhus C, Denmark, and Energiteknik och Termisk Processkemi, Umeå Universitet, SE-90187 Umeå, Sweden