这个问题考虑了管束的2D部分。该池子由均匀间隔的管，其直径为1厘米，这是在整个横流体流动的交错。它们的中心是由2厘米的方向，和1厘米的方向上的距离分隔。该行具有1米深度。-This problem considers a 2D section of a tube bank. The bank consists of uniformly-spaced tubes with a diameter of 1 cm, which are staggered across the cross-fluid flow. Their centers are separated by a distance of 2 cm in the　 　direction, and 1 cm in the　 　direction. The bank has a depth of 1 m.