求翻译：对于换热管，流体的存在很小的程度上加大了其自振频率，且随着外径、壁厚的增加，换热管一阶湿共振频率随之增大，换热管一阶湿共振随着壳层流体密度的增大而减小，但不是很显著；随着最大跨距的增加，换热管一阶湿共振频率随之减小，多管束情形下换热管壁之间的相互作用得到了加强是什么意思？

For the tubes, there is very little fluid to increase the extent of its natural frequency, and with the outside diameter, wall thickness increases, the heat exchange first-order wet resonance frequency increases, the resonance tubes with a first-order wet the shell fluid density decreases, but not v

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Regarding the recuperator tube, in the fluid existence very small degree has enlarged its base frequency, also along with the outer diameter, wall thickness increase, a recuperator tube step wet resonance frequency increases along with it, a recuperator tube step wet resonating increases along with

For for heat pipe, fluid of exists is small of degree Shang increased has its since vibration frequency, and as od, and wall thick of increased, for heat pipe a-order wet resonance frequency with of increases, for heat pipe a-order wet resonance as shell layer fluid density of increases and reduces,

In charge of changing heat, existence very little degree of fluid increase it and shake the frequency by oneself, and with the external diameter, thick increase of the wall, change thereupon increase of a steps of wet resonance frequency of hot tube, change a steps of wet resonance of hot tube to re