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Cold model experiments were carried out to effectively produce spherical solar cells made of single crystal silicon. Water was used as the working fluid. A single-hole nozzle was chosen to generate water droplets in the dripping mode. The wettability of the nozzle was changed by coating repellent on it. The diameter of a water droplet thus generated depended strongly on the wettability. The flow field in a droplet was visualized with a CCD camera and the velocity vectors were determined with particle image velocimetry. The flow pattern in the droplet was correlated based on the Weber number similitude. A Weber number range suitable for producing single crystal silicon of high quality was found.

Model Experiment on the Production of Silicon Droplet