SYSTEM AND METHOD FOR USE IN FREEZING AND COATING AFTER IMPACT OF MICRON-SIZED DROPLETS ONTO SPHERICAL SURFACES

摘要

A system and method for use in freezing and coating after impact of micron-sized droplets onto spherical surfaces. The system comprises a droplet impact test platform and an image acquisition visualization system. The droplet impact test platform consists of a low temperature control system (1), an electrostatic atomizer (6), a particle distribution plate (11), and a lifting platform (13). The electrostatic atomizer (6) is placed on the upper end of the low temperature control system (1). Spherical particles (10) are arranged on the particle distribution plate (11). The particle distribution plate (11) is placed on a ribbed plate of the lifting platform (13), and located inside the low temperature control system (1) at a position directly below a nozzle (8). The image acquisition visualization system consists of a high speed camera (2), an LED light source (12), and a PC (4). The PC (4) is connected to a port of the high speed camera (2). The high speed camera (2) and the LED light source (12) are symmetrically placed at both ends of the lifting platform (13) with the lens and the light source being at the same height as the centers of the spherical particles (10). The test operating condition is a low temperature condition. Images about freezing and coating after droplets impact onto the spherical particles (10) can be acquired clearly. The invention is suitable for study of coating and freezing after impact of droplets onto solid surfaces.