Figure 6 shows the velocity vector maps and the corresponding streamlines to the vector maps 5, 15 and 25 minutes after the heating is started. The velocity vector maps are calculated as mean values from 20 instantaneous velocity recordings by adaptive cross correlations and finally range validation procedure was applied. After 5 minutes the inlet takes place from flap 3. The downward stream due to the position of the outlet at the bottom of the tank passes flap 2, while some water is sucked in through flap 1. After 15 minutes the inlet takes place from flap 3 and flap 2 and cold water is still sucked in through flap 1. From this time and throughout the experiment that lasts for 50 minutes the inlet takes place from flap 3 and flap 2 while cold water is sucked in through flap 1.

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