Hareketli yüzeylere çarpan damlacıkların deneysel olarak incelenmesi

Droplet impact on moving surfaces has been studied experimentally by using high-speed photography technique. Fluid properties (droplet diameter and velocity), surface properties (wettability and roughness) and surface velocity have been altered. Distilled water was used as working fluid. Hydrophilic, hydrophobic and superhydrophobic surfaces which have different roughness levels have been used in the experiments to understand the effect of wettability and roughness on droplet behavior. In addition to droplet behavior, effect of Wen, Wet and contact angle on droplet spreading in radial and tangential directions have been studied on hydrophilic and hydrophobic surfaces. Dynamic and static contact angle have been measured. Dynamic contact angle which consists of advancing and receding contact angle have been measured using tilting plate technique and static contact angle has been measured by using sessile drop method. Moreover, roughness of the surfaces have been measured by using white light interferometry and topology plots have been created. As a result, various types of rebound, deposition and splitting mechanisms have been investigated depending on the Wen, Wet and surface properties. Regime maps have been created for each wettability and roughness as a function of Wen and Wet. Furthermore, radial, tangential and area spread factor figures have been presented as a function of nondimensional time for each contact angle at different Wen and Wet.