Regarding the issue of pulling force
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I saw a question: In heat exchanger design, the grooves provided for thermal expansion are intended to increase the （） between the tube sheet and the heat exchange tubes, while the requirement regarding the roughness of the tube holes is meant to achieve （）. The answer is: pulling force sealing. Excuse me, isn’t it the case that the pulling force should be as low as possible? Why increase the pulling force again, or is it to increase the allowable pulling force? https://bbs.hcbbs.com/thread-542099-1-1.html
To increase the allowable pulling force, it is better for the actual pulling force on the heat exchange tubes to be as low as possible. When the actual pulling force exceeds the allowable value, considering the addition of expansion joints is an option:lol
One is the theoretical allowable pulling stress, and the other is the pulling force on the heat exchange tubes during actual operation. Theoretically, the higher this value, the better; in practice, the lower it is, the better.
The pulling force is calculated based on the area of a single tube; check the various options in the formula
There is a problem with the way this question is phrased; the answer should be changed to the allowable pulling force (or tensile resistance). The magnitude of the pulling force depends only on the conditions of the heat exchanger, and has nothing to do with whether grooves are present or not.
This pulling force is indeed the allowable pulling force
Thank you for your answer; unfortunately, I have a limit on the number of points I can assign, so I’m really sorry