1. Columbia Records introduced the first successful microgroove long-playing phonographs way back in June 1948.

2. The microgrooves with a deeper depth, a narrower width or a higher microgroove density had higher wetting capacity.

3. The microgrooves with a deeper depth, a wider width or a higher microgroove density hold higher wetting capacity.

4. In plastic or hard plastic clay, or water content smaller sand application microgroove blade drill, slowly and evenly drilling.

5. In this paper, with high speed camera, the visualization experiments for the heat transfer characteristics of spray cooling on rectangle capillary microgroove groups surface were carried out.