1. Otto von Guericke University Magdeburg, Magdeburg, Germany;
2. Brick and Tile Research Institute Essen Regd., Essen, Germany;
3. Friedrich Alexander University Erlangen Nuremberg, Erlangen, Germany;
4. INPT, UPS, IMFT (Institut de Mécanique des Fluides de Toulouse), Université de Toulouse, Toulouse, France;
5. CNRS, IMFT, Toulouse, France