Abstract
The effects of the size and the angle of attack a water droplet on the ice accretion are investigated when spraying liquid-gas flows against a flat plate in a freezer. In the case of a small droplet of which Sauter mean diameter (SMD) is 20.9μm, the graze icing is formed and the thickness and density of the ice accretion on the flat plate is 10.6mm and 213kg/m3. In the case of a large droplet of which SMD is 43.2μm, the rime icing is formed and the thickness and density of the ice accretion on the flat plate is 2.6mm and 617kg/m3. Due to the disturbance caused by the freezer wall, the thickness of the ice accretion in the case of the small droplet is larger than that in the case of the large droplet. A feather shape icing is observed on the bottom of the flat plate. When the angle of attack of the flat plate is changed from -90 to -81 degrees, the angle made by the spraying direction and the flat plate surface changes by 9 degrees, whereas the feather angle change is observed to be 3.1 degrees in the case of the small droplet and 6.0 degrees in the case of the large droplet.
