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大多数纵向内肋片管的中心通道(主流)截面和肋间槽道(Z 股支流)截面之比F_0/F_k 约为20～100。因此,介质在纵向内肋片管中的运动,可以看成是主流在中心通道中的运动和Z 股支流在肋间槽道中的运动。支流的流动特性取决于肋间槽道的几何尺寸d_(зк)、h、2b(图1)和主流的水动力特性。因此主流和支流之间的速度分布规律,可看成是在一个不闭合的肋间槽道中进行,从而设想介绍在纵向内肋管中的运动。
The ratio F_0 / F_k of the central channel (main stream) section and the intercostal canal channel (Z-strand stream) cross section of most longitudinal internal fin tubes is about 20-100. Therefore, the movement of the medium in the longitudinal ribbed tube can be regarded as the movement of the main flow in the central passage and the movement of the Z-branch flow in the intercostal canal. The flow characteristics of the tributaries depend on the geometry of the intercostal channels d_ (зк), h, 2b (Figure 1) and the main hydrodynamic characteristics. Therefore, the velocity distribution between the main stream and the tributaries can be considered as being carried out in a non-closed intercostal canal, thus envisaging the introduction of the movement in the longitudinal direction of the inner canal.