The effect of Weber number on the dynamic contact angle during the impacting of single droplet onto a hot oblique surface

The effect of Weber number on the dynamic contact angle of single impacting droplet onto inclined hot surface has been studied experimentally. The Weber number variations are 10, 30 and 60. To adjust the Weber number variations, the droplet injector is modified at various height. In the present study, stainless steel is placed as heated material while the surface temperature is adjusted at the desired temperature, they are 100°C - 220°C controlled by the data logger. The droplet phenomena was recorded by high-speed video camera with frame rate 4000 fps and attached with the macro lens. The objectives of this studied are to understand the regime phenomenon, the time variations, and other important parameters of a droplet impacting onto an inclined surface. It was found that (1) the regime of droplet phenomena has specific models for each range of temperature, (2) The increase of Weber number decreases of contact time at temperature 200°C and 220°C, (3) The increase of Weber number increases the spreading ratio significantly at 200°C and 220°C, (4) The increase of Weber number will have significantly affected to result of advancing and receding contact angle are presented.