冷孔 meaning in English

cold bore

In the swirl , air stream at the periphery tend to have higher temperature compared to that in the center . by means of a separating plate , the airflow is separated into streams of hot and cold air . each stream of air then emerges from a particular end of the tube , named the cold and hot end accordingly
气体在热端管的流动过程中，外层气流温度升高，内层返流温度降低，高温气流从热端阀流出，低温气体通过冷孔板流出，从而将进涡流管的气流分离为冷热两股温度不同的气流。