| 
                Water tank A wash basin, a cookie tin and a green tea
                    container (cylinder) stacked together.
 
                        
                            | The diameter of the
                            cookie tin: | 16.5cm |  
                            | The diameter of the
                            tea container: | 7.5cm |  The base of the cookie tin was insulated
                    with polystyrene foam. Working fluid Water  Visualization The temperature distribution at the base of
                    the water tank was made visible using liquid
                    crystal sheet. The flow of the water was made
                    visible using aluminium powder. Photography
                    was done with a stationary camera using
                    strobe photography.  Experimental process A temperature difference was created by
                    pouring hot water in the wash-basin and ice
                    water in the tea container. The tank was
                    placed on the
                    rotating table and turned in a clockwise
                    direction.  |   |