This paper studies the pin-fin tube, smooth tube and finned tube on the same wind channel test apparatus through experimental method.
采用实验研究的方法，分别对针翅管，平直翅片管和光管在同一风洞实验台上进行了实验。
The first tube was winded pin-fin tube which was improved and self-designed.
第一种是自行改进设计的绕丝针翅管。
The first tube was winded pin-fin tube which was improved and self-designed.
第一种是自行改进设计的绕丝针翅管。
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