Dry ice has many applications. Let 's focus on the artificial rainfall today, which is an important aspect of its applications. We must have heard of the artificial rainfall, but it is impossible that every one knows about its principle and process. So next, I will introduce something about the dry ice and artificial rainfall for you, so that everyone can have more understanding of the artificial rainfall. The following is a detailed introduction.
1. The principle of the artificial rainfall
The formation of rainfall must meet the macro and micro conditions. Macro conditions refer to adequate water vapor and updrafts. Microscopic conditions refer to the physical process of increasing cloud droplets, including condensational growth and collision and coalescence. So, even there is cloud，which does not meas there must be rainfall.
2. The process of the artificial rainfall
Dry ice sublimes, solid state turns into a gaseous state, while absorbing a lot of heat, resulting in the condensation of water vapor in the air to form a tiny ice crystals, then ice crystals as condensation nuclei, water vapor condenses into water droplets.
3. The catalytic operation of the artificial rainfall
The catalytic operation of the artificial rainfall includes the catalytic time, sowing position and sowing dosage
Catalytic time: It mainly depends on whether the weather conditions are favorable, whether the macro conditions of the cloud and rain is appropriate. Weather conditions mainly examine the weather situation and atmospheric static stability. The macroscopic conditions of cloud and rain mainly consider water vapor and rising motion.
Sowing position: Catalyst in cold clouds should be sowed in the supercooling zone with abundant primage, that is the upper of the cloud. Catalyst in warm clouds should be sowed in the cloud.
Sowing dosage: It is affected by factors such as cloud thickness, water content, vertical airflow, cloud structure and the role of catalyst. Generally speaking, it is mainly determined by cloud thickness, airflow intensity, water content and other factors.http://www.wxytgas.com/