| 释义 |
natural draft natural draft[′nach·rəl ′draft] (fluid mechanics) Unforced gas flow through a chimney or vertical duct, directly related to chimney height and the temperature difference between the ascending gases and the atmosphere, and not dependent upon the use of fans or other mechanical devices. natural draftThe flow of gases in a chimney due to the difference in temperature and density between the gases within the chimney and the outside air. |