So one sideflow charts should become three dimensional gradually, the other sideflow charts should realize vivid animation.
所以一方面流程图要逐步实现三维化或准三维化，另一方面流程图要能够实现比较形象的动画。
2
The correctness of using periodic unit duct model to simulate the shell-sideflow and heat transfer is confirmed for the first time, when using the corrugated tube.
Under low packing density, convection is significant in shell-sideflow, which is preferable for the reduction of dead zone area and the higher utilization of contacting area.